Pilot Air/Fuel Screw Adjustment Explained - Multiple Carbs - Part 2
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- Опубликовано: 4 фев 2019
- Blog post - www.howtomotorcyclerepair.com...
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Aux fuel tank
amzn.to/2WJboTy 
Хобби
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Pilot jet explained blog post - www.howtomotorcyclerepair.com/how-to-size-your-pilot-jet-pilot-screw-explained/
Aux fuel tank - amzn.to/2WJboTy
Can you make another video showing where the carbtune vacuum hoses being inserted?
Wow you are good teacher. Thanks. I am having issue on a ttr110 tried different jets to control bog at full throttle but now I have good ful throttle but no idle and when I change pilot I get full open bog I'm so confused can't get both to be right. I have a air screw and a welch plug do I have both air and fuel screw? I thought u said there is only either or.
Royal Vintage Spare A112 Auxiliary Fuel Tank For Servicing Your Bike 300Ml
"Every jet size is a 3 - 5% change, approximately, and I also made that number up." And subbed...
I did the exact same thing
As far as carb adjustments, this is definitely the best video ive watched so far. Also explaining how it works. Thanks a bunch. I feel way more comfortable going foward with my 1st attempt
You not listen to any other explanation. This guy teaches well explaining and showing what to do
Wow. Amazing tutorial. Your description of the air vs fuel metering pilot screws was extremely helpful.
Already liked that video last year when I found it, looking for info about carb and rebuild and tuning but want to say thanks again since I completely rebuild both of my 96 1100 Virago carbs and currently having some issue to tune it well. I looked and dozens of videos but this one, I I look at again, clarified everything. You are very clear and really take the time to visually explain how the carb works. Thanks man! really nice work!
just bought a 1980 KZ750 I’m working on getting it running thanks this has been helpful
Thank you for this video and explaining this in depth. I have a 08 kawasaki teryx with the 750 and I don’t think the carbs have ever been set right for the riding terrain here in Oregon. So again thank you for taking the time to help
This is one of the best explanation when it comes to A/F mixture, kudos man!
this helped me out a lot! I'm working on my pilot circuit on my yamaha radian, thanks for the informative video!
You might have just saved my bike. Stay tuned! Thanks for taking the time. The most informative video on the subject that I've found. I can't wait to get home and try this.
Hahaha. Stay tuned. XD
great job thanks for making this. seems like whenever I need to do it I forget all this stuff.
Watched tons of videos trying to figure out what i need to be looking for, for my carb and no one has explained it as clearly as you do. It all suddenly made sense.
Very good and helpful information. The popping noise you spoke about, is ignition noise (picked up by camera's audio input), from the motorcycle when running.
Nice job. Very well explained. Educational videos. Was so glad that parts 1 & 2 were back to back. Keep up the great work
This was one of the best vids I've seen in the carb section. Very helpful.
Your videos are always on the spot.
Wow excellent Matthew, I have been mechanic on these for 55 years but some mixture screws didn't give me the proper response..you have taught me how to better decide the pilot jet configurations..Who says you cant teach an old dog new tricks..lol
Oh by the way..the carbs are already synchronized before this video?..Yes?
Liked and subscribed..thank you very much.
Peter
Yes carbs need to be synched before this procedure.
Hi there Matthew,thank you so much for your qualified videos & for sharing your knowledge with us ,thank you friend 🙂🙂🙂
Thank you very much for sharing that video, it was really informative and you helped me learn how to tune my pilot screws for my Kawasaki KLE500!
Great job,people like you should have more publicity
Great temporary fuel tank....safety is important. great video...will try various adjusts on my kz 750. thank you for video
your video is the most accurate , informative and concise I've ever found!!!
I'm impressed with your knowledge and ability to teach. Taking the time to illustrate the theory is top notch stuff. I learned a lot, and really appreciate the time and effort you put into creating this video. I have an '86 Ninja ZX600R, purchased in '90, and it's always suffered from being too lean in the pilot circuit, and falling on it's face when the throttle is rolled on. I've had the carbs off and apart for cleaning, probably 3 times since purchase, (learning more as I go along in life) mostly due to leaving it sit unused for long enough that the fuel went bad in the carbs, but I didn't know about how jet sizing has an effect on mixture ratio, even though the pilot screw might be out enough that they idle is good. I've even synched them, and although there was a noticeable improvement, it's never be perfect. I'll be I could go a size or 2 up, and cure the issue, if any company is making jets still. Thanks again!
Check out jetsrus.com
I have a 1980 yamaha xs1100 special and I have been having issues with setting my idle after rebuilding the carbs. this whole video gave me sooooo much help in understanding how this system works, I thought I had an air screw, turns out its a fuel screw. I'm an automotive tech and never messed with bikes before now and I appreciate how in depth you got explaining this.
I just wanted to post an update. Because of your video i now have a running and riding bike. Thank you soooooo so much
What did you do? I have a 80 XS Standard...
Great video, very comprehensive. After removing the welch plugs on my '94 Kaw Voyager 1200, I discovered that two of the pilot screws were buried (zero turns out) and two were about 1.5 turns out. The plugs looked factory, so it's shocking that Kaw (or Keihin) would have messed up so badly. The guy I bought the bike from told me that it was originally sold in CA, so maybe that has something to do with it.
Thanks man, great explanation on how it all works. I recently resurrected an 86 vmax that had sat for 10 years, bad gas, rusted tank, frozen carbs, etc. Runs great at upper rpm but won’t idle without choke. I should have removed the factory set pilot screws before I soaked the carbs, as you mentioned, probably the issue. Going to do it now. My thinking, since only has 5k miles, was that factory setting probably correct. I might even see about getting larger main jets, but the thing is insanely fast the way it is.
Yeah you need to remove the fuel screw and clean the passage. It is the most important and smallest one.
Really want to thank you for all your very informative video's, I recently bought an 82 XS 650, and since then I have learned how to make noise out of money!
I have Mikuni VM26SS carbs and they have both fuel and air screws
Just thought I'd point that out to ya but great info u always give and keep up the good work 👍
thanks man .. exactly the explanation that i was looking for
Probable the best I’ve ever seen someone explain this most people just set their screws to oem and leave it at that
I was a tech in a Yamaha dealership back in the eighties and Yamaha said we had to adjust all carbs while using an e-gas analyzer to spec, always too lean, and replace the plugs or they might void warranty. Honda wanted us to do idle drop adjusting which honestly worked much better and no expensive, delicate equipment needed
My bike doesn’t seem to have powerband or the full power it has it kind of feels like too much air or something but before it would bog and just cut off but the bike is a 2022 yz85 and I’m confused it went from fresh to not I cleaned the jets and I tried to mess with the floats and even then out with the top of the carb and cleaned the air filter and changed the spark plug if I don’t know what to do I’m sure it has to do with the carburetor
Why would the pilot screws have to be a 1/2-1 turns out? Both are the same and it just revs higher as I turn screw in, it doesn't bog down till I turn it out around 1/2-2+.. please help me when you can. Thanks!
Hanes manual says the same thing for Kawi
@@Muchteba if no powerband try check your powervalve, it could be stuck with too much carbon buildup..after riding at wide open throttle for about 10-20 second, immediately stop the engine and remove the sparkplug to inspect the colour to see whether its too rich or lean..
Got a bran new carburetor and it boggs out got a 1991 4x4 kawasaki bayou 300 4x4
Well explained and demonstrated. Appreciate it! Thanks!
Hey man thanks a lot man I have Ben putting back a Yamaha 2006 r6 for 3 years now..it was throttling good and reving good..I had replace some head o rings n start the bike n it stop reving and a wile after it start to missing n he other thing as well the throttle body get tight..I take the plugs our clean them n free up the throttle body as well n check all wiers n all is good knick ..thanks a lot man n I'll try the 3 turns out n see what..keep what you do best by Charing your nalage..👍💯🔐
Thanks Matthew Very interesting Video
Thank you! This was very well explained and helped me to set up my carbs which wouldn’t idle after a rebuild (where another person said to set them at 2.5, but that wasn’t right for where I live / what the carbs are set like here)
thank you, this is the closest any video has gotten to providing any information that I can relate to the hitachi hsc32 carbs on the 1980 yamaha xj650 i recently acquired, in fact the carbs are out laying on my bed from me just getting through 2 hours ago putting them back together again for the 5th or 6th time. there is no information in the manual for the fuel adjusting screw it just says "preset (no datum given)" so now I have a guide line to work from, thank you again......
No problem!
Excellent tutorial, thank you! Currently working on tuning the carbs I just rebuilt on a 1994 Yamaha XJ600. My first time doing it, so it's a minor miracle that they don't leak. 🤣 Idles fine but acceleration is poor. I have a MotionPro sync tool I'll be using, and this method to work on the pilot screws. A wideband O2 sensor was a good method suggested, but pricey and involves welding. This looks much more doable for me. I stepped my OEM pilot jets up from #17 to #20. Main jets are stock. We'll see how it goes!
Good luck!
Just stumbled on you channel oh boy you just have answered a annoying problem with my 1990 ZXR750H2 (uk) my idle is slow to return to normal I do have mods I'm running micron headers to a SP stubby can with K&N filter im running 130 main jets high speed running is spot on. I do sometimes have a problem with the bike cutting out when hot at traffic lights your explanation of the pilot jets which I have set at manufacturing setting one and three quarters turned out looks like I need to turn them out further looks like mine is running lean and the fuel is evaporating before its pulled into the engine . I have uploaded a video of my bike to my channel me revving it and you can plainly hear the rpm slowly returning back to normal idle. Great video your never to old to learn thankyou so much for this video. Happy New Year and I hope 2021 is a good one 😎👍 ps you have a new sub
pff man I don't know what to say, you're the GOAT! it helped so much, thx!
Great explanation, much appreciated...
Thank you so much for this educational video. I have an 82 Maxim xj1100 and have been going crazy as to why it wasn't idling without a full choke. Can't wait to try this!!
It's lean if it won't run unless you are fully choked. Choke decreases O²
@@itrunsthough often you see enrichers not chokes.
Absolutely fantastic video with the perfect amount of explanation to fully comprehend it!
Keep up the good job! Well done!!👍
Even 4 years old this video is a god send thank you!
Best video about those screws :D Thank you
Two-stroke pilot valve plug
Individual filters are great maintenance wise. Had em. Bad in the rain though bike runs rough.
Thanks for sharing, great video!
excellent vid great help.could gauges I guess to get the fastest idle,on my old tiumph trident I went from 17 to 19 pilot jets and was surprised on the performance gain as I always thought pilots only really did anything at tiny throttle openings it also got rid off the tiny stumbles it had in traffic,this vid is more applicable to a gs1000g I may be buying but great stuff well done
Thanks!
My problem is I have new mikuni rs36-d8-k carbs on my yamaha xj1100 amd jetted for the engine and per directions it says to turn them out ⅛ to ½ turns out max but it doesn't say from a light seat, fron a turn out, or anything in the directions. A light seat is something that is hard to determine because it is seated against a oring and each carb has a different feel and look when you look at each pilot jet screw with the carbs off so I've ordered a colortune to see where thigs are at. Your video is a great watch for sure and explains things perfectly.
I always ran lean because it gets great efficiency and economy. That extra power gain you get from running rich is not important unless I go to track. When I do track I retune it to slightly rich. Good video.
Sure. I go for performance, sacrificing fuel economy.
Hey Matthew! Great videos you are truly a professional. I have a problem with ground issues. When I start my bike with jumper cables and remove the ground clamp i get a really good set of sparks. I have pulled the stator. voltage regulator it all seem to check out. Is something wrong! Build bikes for everyone. Merrill
Nice explanation, learned a few things thanks!
Very informative, thank you!
this is the best vid in you tube no trash just to the point great explain
Thanks!
You obviously know what it’s about helped me a lot thanks a lot
Hey, just a great explanation and I love rule of thumbs!! Can you tell me where can I get mukuni jets?
I also use spark plug color as indicator, trying to aim to a brownish color. Starting from being too rich with carbon black spark plugs making adjustments down and always running the bike for at least 30 minutes, with highway parts and check again color until right. It can take several days but it seems the most precise method without the use of fancy tools, what do you think ?
Just bought a79 Honda 650 cb. Fun stuff.
That's the same one i've got. Gotta retune the carbs for the summer. How're you liking it?
Great video, clears my concept, I need help, sir. I have a 1986 Yamaha YX600 Radian. I am cleaning my bike's carb and I messed up with the pilot screw turns. Initially, before opening my carb I adjusted the screw which operates the throttle position. Now when I adjust the pilot screw how to combine the tuning with the throttle position screw? how does it work together? and which one should I adjust/tune first? Pilot Screw or throttle position screw?
Finally , someone explains clearly . Very helpful. Thanks
Great Carb info
Hé Nice video im going to try to tune my kle 500 this saturday with your video. Greets from the Hellevoetsluis Netherlands
@Animal Mother haha i brought it away for ultrasonic cleaning to an motorcycle shop and they cleaned it en adjusted it for 50 euro 😃 so I never did it 😑😁
How cool is THAT?? I'm working on the exact bike! Thanks for the video.
Very informative! This is going to save me a bunch of headaches.
Nice when someone is willing to share knowledge, good vidio very well explained top team player.
Oh, " and I also just made this number up" lol....regardless...I just took some of your advice! Very nicely done btw! I've ordered two Main jets size 125 , two Pilot jets size 42 and 2 shim for each Slide Needle for my 84 750 Shadow!
I'm going to 3 turns air screw instead of 2 and 1size richer pilot jet. I've had a low speed cruise sneeze for years bugging me. THANKS 👍
This info applies to the carbs on small airplanes. same principle on the idle. thanks.
Pretty much same principle for all gas engines.
This is a good video. I hope between both your videos and mine, maybe people might start to understand how to do this on their own. But still I think people don't want to spend the type testing, changing a setting, testing, and so forth.
Thanks. Tuning can be a PITA, however with this circuit the answer is in the screw setting. Don't even have to ride it to determine if it is lean/rich.
Right, but novices I think lack the analytical mind we may have. This video builds on our previous information around the topic. Too bad it can't be better centralized. I have tried to do that on my website, and I might embed your video there.
@@thejunkman Yes and this is also assuming the carbs are in perfect shape. We all know that is rarely the case.
@@HTMR my vtx mixture screw was completely burned out and crudded up with rust and kept playing with the mixture not realizing till I dug deeper and once I cleaned it up it was much more responsive but now I’m dealing with slight hesitation during acceleration using barons set with 210 but they didn’t assign numeric value on pilot
Have you done a carb adjustment on a 1978 Suzuki gs1000? Would help greatly. Thanks.
Very useful info. Thanks.
Great turorial.👍👍👍🏍🤟🏻
my 90 gs500e's stock spec is 3 turns out. When on the highway at speed, if I slowly roll of the throttle and then back on again (to go +/- highway speed) it pops as I turn the throttle. Doesn't pop anymore after the throttle is turned 1/8. These are set to run lean for sure, so my thinking is 3.5 turns out, which is what I had it at prior to resetting it.
this video is awesome. greetings from Chicago!
You are marginal on those pilot jets. Probably need to go up 1-2 sizes.
I probably do. Maybe ill get some new jets. You should also mention in your video that most of these non-oem jet kits come with inferior brass jets. that was a problem I had with the rebuild kit I got from ebay. i ended up not using them all. but the float bowl gaskets were good!
on the Mikuni BST33's that the GS's come with, the thinking is 3.5 turns out is the most you can do anyway, so if this doesn't solve the problem, new jets will be the answer. Why am i throwing parts at a 29 year old bike?? Because it had 10,500 miles on it when I bought it.
Just tuned up my pc800 and added a new air filter. 65k miles and she's running like a peach!
did you saw off he stops on the air/fuel limiters/?
very good explanation thanks👍🌟
I need a friend like this guy, I go to mechanics and they mess my bike up more then when I brought it, where's all the good semaritan mechanics in NY
Hi Mathew. Love your videos man!! I see excellent info on how to determine what pilot screw one has. As a new subscriber I'm not if you've covered what the best distance is between your pod / aftermarket filters and the carbs and how to determine the distance. I have heard that some engines are not "happy" with pods connected directly onto carbs. Can you assist please? I'm currently busy with a CX 500 cafe build and any info would be immensely appreciated.
Cheers mate
Joe
I just install them directly to the carb. Just make sure not to block and passages on the carb body.
My 1983 suzuki gs550e is running rich and runs well except in the mid ranges, full throttle, it studders and doesnt want to go. What could I fix it with?
Awesome video thanks
Thank you a million!
Absolute clinic. Insta-sub. Thank you 🫡
Great video..
This popping sound is your microphone picking up ignition coils/spark plugs running
Great explanation on afr.....thx
Thank you, you are the best
Nice job bud 👍
Thanks for your time
Great video appreciate the detail you put into your work and videos. DIY wideband O2 sensor portable air fuel mixture gauge? I wonder if it would work? You weld a bung into your hot rod header for the wideband O2 sensor. It gives you stymiemetric* fuel ratio. lol. When it is under a load thanks bro
I've always wanted a wideband. For now, I use my ears and butt dyno.
LOL I'll have to try the butt dyno
Hello! I'm thinking to do the same procedure on my Honda Hornet 600 model 2001. Does it has to be with the air filter on it or i can do it without it?
Is there a way to take them out i smooth my top off
Matt,
What would you do for a bike that is running rich? The bike is stock 1997 Zx6r except for a D&D slip on exhaust. The carb jets are pilot 35, 148(outer) and 150 inner jets for main. The stick setup is 35, 145, 150. There is an eclip slide needle that was set on position 2 from the blunt end. I reset that to the last position making it as lean as it can go. Problem is the bike idles great and revs fine at rest. Take it off the driveway and it hesitates, sputters with intermittent acceleration. These carbs have been cleaned numerous times, floats set at 19mm, 17 was stick setup and was a +\- 2mm option. I had float bowl overflow at 17 so I reset to 19mm. Any ideas?
super clip thanks
Thanks you MatthewMCrepair for making this videos and helping us out. I have one question. I have CBR 600, 1998 and it runs great on the streets but idle sometimes drops below normal point. Smell from the exhaust is really hard (gasoline) all of the pilots screws are 2.5 turns out (somebody before has messed with the carbs). I have taken the spark plugs out and found that number 1 and 2 are really black. 3 and 4 seems to be OK. Should I try to put number 1 and 2 let say 2 turns out and leave number 3 and 4 2.5? Or should I lean all 4 of them a bit and see how it runs? Thank you in advance and greetings from Croatia.
@@embededfabrication4482 Tnx for the help. I will do that and see how it runs. Cheers
good stuff!
hello!great work!i have a suzuki freewing xf 650 no exhust (im planninig to install)but open airbox..for sure going faster accelaration and sound but donst work perfecly..i was thinking for some jet kits tuning...please i need your help...thank you in advance
🙂
I did not read here where anyone talked about checking actual air flow on each carburetor. I used a device that had a rubber seal. Place the device on carburetor # 1. There was a ball that floated in a clear tube. Adjust it until the ball floats in marked center. The place the device on # 2 carb. If the ball was not centered, you got to adjust carburetor linkage to sync the carburetors. Same with the #3 carburetor. You need the exact air flow on all carburetors. Last adjust the mixture needles. The only way to get it done right.😅
Thanks for the great video! What main jet size are you using with these air pod filters? I'm working on my 1990 XJ600 right now with the same air pods.
Usually add 10-20 on top of the main you have. For example, if you currently have 100, then 110-120 will work.
Hello! Thanks for the detailed explanation! We are also in the the process of the tuning the fuel screws. Two questions if someone knows to help out 🙏
1. Before starting the process, where should be the idle revs configured? High, low or manufacturer suggested? Or something else?
2. What happens if the screws are in a location where it is probably impossible to tune them while the engine is running. Any tips and tricks?
P.S. The bike we are trying to tune is Honda Cbf 600, 2004. Thanks!
Well. . .I have looked and looked and this is so helpful, beats everything I've seen, so very well done and much appreciated. I could use a few minutes of private tutoring, are you available?
Thanks excellent video