xr650l carburetor adjustmentxr650l carburetor adjustment

Lean mixtures can overheat the engine, cause detonation, and damage the rings, piston and valves of the engine. This requires sending them my seat during the riding off-season. Stood 5' 11" at my peak, a recent check has me barely 5' 10". Our favorite places compass still bears strongly NW. Grant & Susan are veteran motorcycle travellers - RTW north to south, two up on a 1986 BMW R80 G/S. 4) If I fire the engine with the choke on full, it must immediately be stepped down to middle position or even off (warm ambient temps now around 75 degrees F when I start the bike). If doing so allows normal starting and idle, do a traditional wide-open-throttle run and shutdown.

I'll play with this in the future and comment further. This was stock, as the bike, fortunately, was original sold in Texas. There aremany sources for these jets. I don't believe that any properly tuned engine should be "hard to start". I don't know if the carb has 2 mixtures screws, since there is a cap below the fuel intake hose, and others Keihin carbs has 2 mixture screws. You don't have to be a Member to come to an HU meeting, access the website, or ask questions on the HUBB. Did you get a Moose kit? Johnny Rivers, Roy Orbison and other country/rock singers worked better inthe localNevada cowboy barsI got into everything Motown shortly after high school but alwaysenjoyed Johnny Rivers. Already have an HU account? Not sure where your market is located. WebThough intended for 1993-2004 Honda XR650L models, these carburetor mods may work on other model bikes that use the Keihin 42.5mm diaphragm-type CV carb. Feel free to post any or all of these photos here at the forumsWe have the Photo Gallery. Get Ready! Stock needle doesn't have adjustments at all. If you do so and the engine still has the auto-decompression OEM camshaft, make sure you back off the rocker adjusters enough to be certain all four valves are seated with the piston at TDC on the compression stroke. 3. This gets very tricky and changes are usually so subtle that you need a dyno (except idle adjustments) to be able to measure effects acurately. The XR650R power to the ground is tremendous, however, you'll have no problem keeping the front wheel on the ground,especiallywhen hard desert riding. 5-1/2 years ago during a move, I parked the motorcycle and did not drain the fuel bowls.

Upon graduation, he wound upperforming aircraft engine impeller repairs. After rebuilding the top engine and performing the jet change, I finally did what should have taken place in the first place: removal ofthe carburetor, cleaning it and rebuildingit with a "kit". Do not try to rotate the crankshaft backward to get TDC. (The 53E needle is common as a needle replacement.) I'm doing basically the same thing Moses did to rebuild it but without the cam. I'll definitely look at itagain on the next oil change. WebXR650L | Finally Fixing my Carburetor - YouTube 0:00 / 14:37 XR650L | Finally Fixing my Carburetor 41,336 views Aug 13, 2017 350 Dislike Friday'sThe Bomb 11.3K subscribers The muffler canister is stock. I did drop the 175 main jet down to a 172, a slight compromise for our local altitude and runs. ME ask YOU for advice ? Check now Retail Price $ 1,241.99 Our Price $ 999.90 Availability: In Stock (Changes Daily) Complete Throttle Assembly ($ 89.90) Complete OEM Part Tuning Performance Upgrade ($ 100.00) Upload or insert images from URL. The Moose kit has raised my brow as to the 145RD jet in mine. I start my bike just the same way you do. 3. Note: Currently, I am testing an Enerpulse Pulstar spark plug tooffset the slightly rich-side 172 main jet burn. I'm using the following service manual link. But from 1/3 throttle on up it seemed slower and flatter than with the stock CV. See the trailer! Being colder, I would not use the"8E" while you're experimenting with fuel mixtures.

Fattening the pilot flow may be part of the Stage II cam tune; however, make sure you're not just compensating for an air leak. Type the word"oxy-acetylene" (without quotes)into the magazine's search box at www.4WDmechanix.com. Also available for download or streaming on Vimeo! Thanks Scott! Ifound a listing for a seat cover, and this could be more to your liking, anyway. This keeps the upper cylinder cooler. If you remove it, the bike will lean out further (more air in comparison to fuel) and the main jet will need to be bumped up "number-wise." Please tell me when you fix the seat. I am academic, and if Ithought the 172 mainjet was risky, I wouldinstall an oxy-sensor bung at the appropriatepositionon the muffler and test with an A/F meter. If I make a change, 165 would be a conservative firsttest. These intrepid women share their tips to help you plan your own motorcycle adventure. Granted, I'm not excited about the idea of riding the XR650R on asphalt for 500 miles at a stretch like I did with BMWs. Gently screw in the new jets. Make sure there is normal free play at the cable to allow this valve to close without anyinterference from the manual decompressor. Since this is not a wear item, I left mine as-is. You need to lower adjustable needle a bit to lean the mixture. The year is 1993, and your brand new Honda XR650 is just about the most capable thing on two wheels. Four Strokes have a better tolerance towards an engine running lean or rich but still highly unrecommended. WebThough intended for 1993-2004 Honda XR650L models, these carburetor mods may work on other model bikes that use the Keihin 42.5mm diaphragm-type CV carb. I painted it with barbecue paint (800 F test - best I could get), and tomorrow it will be put to the test. Meet people who don't think you're crazy for wanting to ride your bike to South America or across Asia!

The same rubberintake manifoldshown inthe U.K. carburetor illustrations? What's the most bomber air filter option? Off-highway or "competition"improvements do not violate EPA and California emissionsbecause the bike is not presumed to bestreet ridden. Its still fed by a Kehin CV carburetor, but its grown from 40 to 42.5 mm. Even with the tab removed, mine has a slot for a screw driver, so it's still reasonably easy to tell how far it has been turned, even when it's installed on the bike. members and guests would find that interesting. The plate is terrific but it amplifies moving parts noise levels like a stethoscope or megaphone! Unlike Bob Dylan'sshort interest in a Triumph (long enough to make an album cover at least),Inever fell off my Beezers! When you are ready to run the engine and test ride, the success of your carburetor tuning will be very clear. No air box restrictors, right? I really appreciate your help. What it comes down to is actual air-fuel ratio. carburetorsor even the Moose Racing kit.

For those of us who ride the desert, these XRs are great machines. Unwanted air available when your jetting is too rich (pilot or main) will cause speed flare-ups. Run the carburetor out of fuel before shutting it off, or at least down a bit.

We use data about you for a number of purposes explained in the links below. In still air, you can hear a P51 from miles away. (The Moab Areacan provide a range of 4,000-6500 feet,possibly moreatthe La Sal Range.) The needle was in there already, but I put in the new one and the holder anyway. should have gotten it a while ago. Sure, the old XR isnt going to win many battles on paper, but when you need one bike to do it all, and do it cheap, the XR650 is your bike. "Inspirational and Awesome!" Temperatures between 65F to 95F (with that humidity it seems to be 105F). It had been run without an air filter and with questionable carb condition and cooling system for an unknown period of time. If you have a drill motor than can be reversed, a left hand drill bit will often spin a screw loose while you're attempting to drill the hole. Less timing advance meansa loss of performance. Other types of carburetors do it the other way. I took them off my old B50MX and put them on my 82 xr500r. RareCj8A leak down test is spot on and conclusive (see HD video for details). So I was running uncorked, 170 main and 65S pilot (at least I think it was a 65S) and the clip in the standard position. However, I never underestimate the capacity or skill of any practiced weldor. When you have the piece repaired, make certain the weldor positions the two shell parts as they were originally. CostaThanks for posting! What is the MPG of your XR650R? Probably just the old rider tuning? You could also try adjusting the mixture screw to 2 turns out to see if that helps when hot. When you read the jet change charts, even from Honda, there's a wide range of adjustment for ambient temperature and altitude.

The back fire was a great flame when I cut the throttle, and then I stopped the motor and decide to wait for the jet kit I ordered. Check for smooth operation of everything and reinstall the carb on the bike. The washer and O-ring on your new pilot needle is practical and functional. These machines have a following, and Michigan is no exception. I've been very busy with work and constantly think about riding, the XR650R is a metaphor for cutting loose. The Carb in my XR650R is a PE 78ABOA with the B enclosed in a square and a mark of some kind after the last A that is not a number or letter. That bike was an absolute blast and proved the point: You're always riding the "best" bike ever, because you need to be in the game on whatever's beneath the seat of your pants! My approach will likely be an alloy iron/chrome/moly, patented L.A. Sleeve liner in place of the factory Nikasil. Like your engine, mine starts on the first or second kick regardless of how long the bike has parked. When we watched to movie, I was jerked back in time and went on a short refreshertour at YouTube around"Do What You Gotta Do".

Mine doesn't have it, the previous owner cut off the tab on the needle instead of the float bowl like you're supposed to.

You'll return alist of linksformy gas welding instructional. When you do have the engine running well with the 175 and 68S, if the plug shows alean mix, you can try the 180 and 72 that Big Gunrecommended. Contact us

Start new topics on your experiences. Tire Changing!Grant demystifies the black art of Tire Changing and Repair to help you STAY on the road! But this time it just didn't want to start, it was like a workout. I have a 2003 XR650R uncorked with an XRs only full exhaust and k&n air filter.

If the needle is stock then the ultimate solution is replacing your main jet with a smaller one. DavidI like your can rattle metaphor! This cycle had been ridden primarilyin Texas (lower elevations) on the lean mixture. 3. Happy toaddress our 2000 model XR650R motorcycles or the twin-carb XR air-cooled models. I have some welding how-to videos at the magazine site if youhave the equipment. What don't I need? Not sure if it's gonna hold up under the temps generated by this bike, but we'll see. I doubt that would have much impact, but at least now it's all set with a new screw, washer and o-ring. Our home base is 4,100 feet elevation and high desert; the average/mean elevation at Nevada is 5,500 feet. Not sure about the whole thing? I'm guessing that a 125 main jet was not in the uncorked version of this engine for very long. He's put a great video together, so I feel as if I know what I'm doing . I would also avoid using a "performance" spark plug like the Pulstar until you are certain the jetting is correct. If the needle still has the tab it's pretty easy to figure out how far you're turning it. (Australian models are much leaner, another story altogether.) at all for an untold amount of time before I got my hands on it. The very fine tip needs extreme care when installing the screw. Formerly swamped my XR650L and posted what I did to get the bike going again. "Just makes me want to pack up and go!" I just bought an Australian2000 xr650r from an honest seller who I spend tons of time with talking about the bike. Here is a picture of the manifold you want to replace. TheReno Air Races (this weekend at the old Stead Air Base) feature P51s, and the pilots often test in the skies over our area. How can I self-edit? The rule of thumb for any motorcycle work is minimal use of force, just enough to get the job done! I trailered the cycle home and looked forward to restoring the fuel system and completing the dual-sport conversion process. The 145rd main jet that is in my XR may have come from the Moose kit, I only know from Moses that it is not a stock main jet. How will adjusting the idle speed help? I use your strategy to start my bike, using the manual decompressor. You could just get on a plane with your credit card and passport and buy or rent everything you need when you get there. Here is a picture of the manifold you want to replace. I promised to check the valve lashes before riding it. Paste as plain text instead, I can get the engine to start most often on thefirst or second kick,at worst, the third kick. It started on one kick. Despite the low mileage, this engine was busy overheating its upper cylinder and valves. I'm in Michigan now, I'm not sure how the folks in this area value these incredible bikes. Learn more about Stack Overflow the company, and our products. I can still run the bike from sea level to 7,000 feet with this main jet although from 4000-7000 feet, the carburetor and engine run progressively richer. (175 would be rich at my altitude and typical running environment, 4200-6000 feet.) Again, my primary riding is at 4000-5500 feet, and I do have the Stage1 camshaft. (This list isthird party info and somewhat dated; confirm current part numbers availableat your Honda dealership.) Formerly swamped my XR650L and posted what I did to get the bike going again. 2. Greg, Australia So, what you need to do is compare your bike to mine, and that's not difficult. Fascinating, David, the photos say it all! I'll likely use this product. The places I ride and plan to use the bike, the loads planned, there will be no guesswork about the condition of the engine. The first time, I found one of the exhaust adjusters was very high in relation to the other one.

The XR650R's unique liquid cooling (the only XR to ever offer it!) Honda XR650L carb problems - My experience. I use NGK, the OEM replacement heat range plugs. 2020 Edition of Chris Scott's Adventure Motorcycling Handbook. It's very forgiving unless you do something really wild. Back to the tools and materials side of things - you will note the "milk can" in the photos. WebOur Honda XR wiring diagrams are in full color and can be read online or printed whenever you need them from wherever you happen to be. For me the next step is prevention. Hi, DavidThe 65s at your altitude could work very well. Is the "choke" set up properly? WebMaking the XR650R run right! The factory does a better engineering job in this areaI'm sticking with the stock Honda filtration system and backfire screen. Its smooth bore design and accelerator pump delivers smooth and responsive acceleration for an overall increase in horsepower and torque throughout the entire power band.

A light rebuild is a wonderful treat for these carburetors, and judging by your idle mixture screw, perhaps you'll be lucky, and nobody damaged the rest of the carburetor. I'm sharing all of this to provide a broader view of how and whenan XR650Rengine will start. Tried to start it again, but it was flooded. Thanks for the response. Again, this could be due to an air source somewhere. The XR650R is much more top heavy. When you buy through links on our site, we may earn an affiliate commission.Copyright ThumperTalk, Inc. - All rights reserved.ThumperTalk is a registered trademark. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. If you do want to let the bike go, I'm certain you will find a buyer willing to do the engine work necessary. Take the rubber boot off the airbox. Watch for it! The idle and tip-in throttle issues are likely related to the pilot jet sizeand the needle height. I teethed on a '69 BSA Victor 441and owned three Honda XR enduro bikes prior to the XR650R. My latest project is to install the front brake re build kit. Ive searched the Internet far and wide for answers, and it seems like youre very knowledgeable on this bike.

Congratulations, enjoy the BRP, and ride for fun and safely! "Ultimate global guide for red-blooded bikers planning overseas exploration. His main jet chart goes as high as 182 (sea level at 20 degrees F) and as low as 150 (for 12,000 feet elevation and 100-degrees F if you can findsuch aplace on Earth!). But even without fuel injection, and burdened with necessary smog equipment and a road-legal exhaust, the Honda XR650 is still good for 40 hp and 47 lb-ft of torque. Anyway, mixture screw only adjusts the mixture when engine idling or running at low throttle while your stuttering should happen with the throttle wide open. And working on the carburetor if you don't have any experience is a bad idea, because it could ultimately lead to engine overheating and such problems that could ruin you engine. My favorite cult classic XR650R movie, "Dust to Glory",shows howrace positions actually change during a pit restart. Using old fuel line and an Allen bolt, assembly time 10 minutes. WHY OH WHY do trolls dig up 8 year old threads to TRYto show that they think they are more intelligent than someone else.. You need to be a member in order to leave a comment. See the trailer here! XR650L TM40 Installation Instructions (See available PDF for printable version) Be safe no smoking or open flame. Try a 52 or maybe even a 55. Please tell us a little about Burundi and what the riding is like in your country. Australian Model is a pure breed (aside from that lean main jet you were talking about). I have no desire to periodically replace intake valves and service the cylinder. To comment on some of the questions you had - GO WITH WHAT MOSESSAYS. But I was just wondering - in other words I'm asking for input - about jetting. The carburetor is one of the only things to change on the XR. The muffler and tailpipe tip are prominent in the article's photos and the video. The author and I believe that reading spark plug coloration is asensible backup to anyjetting experiments. At this elevation, the 172 main jet produces abit darker coloration than ideal but does not show over-rich fuel wetting. Duckatikiller, did you fix your carb problem with the mixture screw or did you have to buy the new 150 jet? I ride trails with my sons and seldom reach WOT so good low to mid range power with crisp throttle response is what I want. These are not spark/ignition or carburetor issues. 49-State bikes are closer to your Aussie type, which fortunately in your case, was a "factory dual-sport". "Uncorked" is the parts list I've furnished in the above threads at this topic. I took it to the street.

I'm not a big fan ofthis carburetor; however, they do work reasonably well when new. In the summer, I'll start mine with full choke, let it run for about ten seconds, turn the choke off and blip the throttle once and I can go ahead and ride away on it - gently until it warms up. Buying ready-made tools can prove cost effective if you value your time. Yep, the distinctive exhaust notes were nearly allHonda XR650Rs, there wasa loneXR400Ralso clipping through the gears! The Road Heroes DVD helps answer the question - Why Go?

Having some trouble getting the carb just right. So I've gone back to the original 175 main and 68S (again, I think it's a 68S). Given the bends and twists in the muffler assembly, off-setting even slightly would have dire consequences when trying to reinstall the muffler! These kits are rubber parts only and, well.

Then when you're ready to start the hot bike, turn the fuel back on as you're hitting the starter button. Let's open up a topicat our single-track travel forum: http://forums.4wdmechanix.com/forum/35-places-you-have-been/! $13 SHIPPING FOR U.S. ORDERS (EXCEPT PR, AK & HI) - INTERNATIONAL SHIPPING (AUS & NZ ORDERS SHIP UPS ONLY), The XR's Only Mikuni Pumper Carburetor 42mm will reveal the hidden performance within your Honda XR650L.

Power-Up Kit (not the all-out racing HRC kit) parts list: Honda Factory Power Up Kit Part Numbers.txt. Take your time and follow sequence steps carefully. I use NGK, the OEM replacement heat range plugs. Why is China worried about population decline?

it has less valve overlap. I will look into a bigger pilot. I immediately rebuilt the top end of the engine, rebuilt the carburetor, mounted new tires and restored the air induction system. I forgot about that part.

I'd like to run some strong lighting for night desert riding, what direction would you point me in lighting wise?

Let us know how the header affects performance now that the jetting is spot onGreat work and attention to tuning. 1. Not sure if it's gonna hold up under the temps generated by this bike, but we'll see. This forces the float down in the bowl and allows fuel to rise high and even to flow out the main jet into the carb throat, which makes the air-fuel mixture richer and can aid cold starting. It was like a dirt wind tunnel.

I've heard about a needle o-ring, what's the deal with that? Hi, PhilFloat level is always important. The covermight allow someroom for additional padding, and a creativeupholstery shop can performmagic. Take the rubber boot off the airbox. WebOur Honda XR wiring diagrams are in full color and can be read online or printed whenever you need them from wherever you happen to be. Because the air pressure being comparatively low at high altitudes, it might cause the above mentioned problems. Can two unique inventions that do the same thing as be patented? I installed the jet kit exactly as described in their directions. There is surely something better than the stock one out there. Check to see what you have for jets while in there,you may want to do "Daves Mods" on the carb while apart if not done already..usually the screw needs to be 2-2.5 turns out from lightly bottomed out what i did to fine tune the mix screw was to listen for when the rpm was at its highest then turn it back in (clockwise) about 3/4. There are several aftermarket mufflers for performance gains (FMF and others). Powered by Invision Community. The transitions indicate proper jetting and needle setting, tested by gradually increasing throttle and noting the engine smoothness at each throttle settingFor my engine, thereis not the slightest hesitation, surge, balking or stalling at any throttle setting. I did run the bowl too low, one time, while showing aCRF450X rider what the XR650R "would do". What plug have you seen work best in this bike over the years? These parts are easy to spot and compare. my 650 was already uncorked and unplugged when i bought it, so i have no idea about condition or jetting, etc. As a footnote, if the float level became distorted while changing the jets, the engine could be either starving or flooding. I increased my search radius to 500 miles when I soughtmy bike, just got lucky when one popped up in our areaLet us know how this turns out. As for the stockXR650R seat, yes, it is hard, especially after an XR350R or XR500R seat from the day! Find somewhere a #150 main jet that fits your carb and replace yours with that one. I am aware of the XRs Only Mikuni kit which is a pumper for 450 or so and the Sudco Keihin FCR41 kit which is 550. Note: Ifthe 125 main jet had been in the carburetorfor a long time,this is a testimonial to two things: 1) the range of jetting flexibility for an XR650R engine and 2) the ruggedness of this engine in tolerating such an ultra lean fuel mixafter beinguncorked! It was extremely frustrating since every time I put it back together, it would run fine for a short while (once it was almost a day), and then stop. Heres a year later (1968) and Al Wilson pressing the same song on a 45-rpm disk at the UK. That said, do we plan to reenact "Dust to Glory"? The idle is still a little erratic, it is much better than before. Take out the plastic insert just forward of the rubber boot. Granted, the XR650R is the beast of the bunch, yet starting the engine should be the least of the rider's challenges. I would put a dyno jet kit in it since you have it off. I will do those tests this weekend and get back to you. Currently Active Users Viewing This Thread: 1. The other friend from Oakridge days is now at Brownsville/Halsey and riding a WR250 Yamaha to work at Cascade Pulphe's settled down since his Honda CR period at Oakridge!

Theengineis lean, and I can feel it wanting slightly more fuel, which I provide with throttle instead of the choke. I have never "run out of air" at the normal rpm ceiling, and the performance is plenty. Thisprovided a sure way to get a considerable cardio-vascular workout with a guarantee that the engine will not start.

This whole discussion reminds me of why I am no longer willing to ride a kick start bike.

In PR I guess you have access to proper products like carb cleaner, I had to make do with gasoline and a borrowed air compressor. I put in a new stock air filter, fired it up, and it runs very strong. WebThe XR's Only Mikuni Pumper Carburetor 42mm will reveal the hidden performance within your Honda XR650L. And Honda is the guideline we use here, its Power-Up Kit part numbersinclude the 175 main, 68(S) pilot and the change in needle and seat. Build a cheap ADV bike, or a stripped-down tracker this bike is literally a blank slate. You'll have more control and uniform cool down withoxy-acetylene welding. 16012-MBN-641 (B53E Needle Set, this is based on tuning needs; at our altitude, try without the needle change first). Given my current sense for the Keihin carburetor, I would be more conservative and stick with short rides at 6,500-7,000 feetelevation for the 170-172 main jetsize. Pleased to assist, Arnaldo. On 11/27/2018 at 10:30 PM, Doug Chaney said: On 11/27/2018 at 11:30 PM, Doug Chaney said: When you buy through links on our site, we may earn an affiliate commission. Have YOU ever wondered who has ridden around the world? The engine runs very strongly from idle to redline, without blubber, hesitation or anything other than a fast ride. At least the XR650R only has one of each. Calendars Featuring the 13 winning photos from the Horizons Unlimited annual motorcycle travel photo contest! We use cookies to improve your experience on this website and so that ads you see online can be tailored to your online browsing interests. We're based at 4,300 feet elevation, and most of my riding is between 4,000-7,000 feet elevation. So next time you come across one of these dinosaurs on the trail, give a wave, and salute the backbone of Hondas dual-sport lineup for the last 30 years. Worth noting, I stayed with the stock air filter box, air filter and flame trap. The odd thing that has happened more than once with my XR500R, is at high elevations in Eastern Oregon on a cold start is that it starts when I first push the kick starter trying to find TDC. Still a bit sluggish when I tried to accelerate abruptly from idle, and it stalls if I keep the throttle on. What do you think and if you think I need to order one, where wouldyou recommend I get a Australian service manual?

The only problem I have now is the seat is too hard. The end result is not super beautiful and I'm tempted to take a grinder to some of the rough spots, but it's good enough. It stalls if I keep the throtle on. The spark plug color looks great, avery good indicator of a single cylinder motorcycle engine's combustion process and air/fuel ratio. (The ignition was stock and tested fine.). Mine work for me, I can start the engine cold or hot on one to three kicks maximum. Home Time for an upper engine tear down, which Icover as a step-by-step HD video at the YouTube Playlist. As far as the main jet is concerned, I opted for a 170 in place of the existing 175. We suggest the JRU-8032 stainless steel washer, but individual preference may lead to a different choice. Could this of been the issue? I'm back at the gym now, consistently after the magazine had me parked in front of the computer for longer than I'd like to acknowledgeI, too, discovered some height shrinkage. Questions like, "is the oil system working properly?"