(3)- HOW TO ADJUST ANY MOTORCYCLE CARB SLOW JET

[hunk909]

wow !! a great explanation !!! simple & in a lay man's language !! i think i too can be a bike mechanic soon.. !! Thanks for sharing !! Appreciate your efforts !!

[DIOSpeedDemon]

@hunk909 CHECK OUT MY OTHER 1000 OR SO VIDEOS ON ALL ASPECTS OF BIKE WORK IN LAYMANS TERMS. I am glad I helped you. It makes making the videos really worth it, thanks. RH

[tpvalley]

the kart is a 100cc direct drive, they rev to up to 24,000rpm but the port timing is quite short, very wide power band, feels wierd to go from 0-70mph in one gear!

The pictured one is a disk valve (TKM- at a guess), they seem to use reed valve induction now.

On the disk valvers u had to rebuild them every couple of meetings and change ring/s every meeting or even race!

[MultiUnanimous]

I have a question,I have a 1997 yz 125 just had the top end rebuilt along with the carb and i replaced the ignition coil ,It starts first kick every time and idles fine , but when i go riding mainly in 2nd-6th gear is sputters backfires coughs etc... , I have replaced my plug and my gas/oil ratio is at 32:1 please any suggestions would be much appreciated .

[DIOSpeedDemon]

@MultiUnanimous Can you make a video of it? It could be alot of things, not just one or two. Make a video and I will look at it. Thanks, Bro. RH DSD

[MultiUnanimous]

@DIOSpeedDemon ill see what i can do i only have a digital camera that i can record with and it's not very good quality.

[mohamadhasmat]

Thumbs up!

[FPSBass]

your voice sounds like dr.phil :D

[n00bje]

Best and most detailed explanation on YouTube! :)

[MHRPOWERR]

U dont need rocked science to build your own pipe:) just the right cms...

[kk8833s]

hi my bike is running rich what shall i do?

[8Libertine8]

"Man, this is getting interesting." : ) Yes it is, lol.

Big thanks btw, i think video 2 just explained my problem.

[Dve33able]

wheew! Did you save my ass! Best instructional ever!

[DIOSpeedDemon]

@Dve33able Glad to have helped. THis is what I make the videos for , just to help. thanks RH DSD

[luckyman96able]

How do you jett a minibike carburetor

[kenneth11208]

What Is that Screw u pointing at 2:46

[DIOSpeedDemon]

@kenneth11208 This is the idle jet and it always has a spring and a black grommet on it. This adjustment gets your bike to idle perfectly without adjusting the throttle slide height and is very important to have adjusted right for a smooth idle to mid range throttle transition. If the idle jet is not adjusted correctly, when you stomp on the throttle from idle. The motor will burp for a moment before taking off. THis is horrible in a start to stop drag race. RHDSD

[memberson]

Hello,

you just help me out, thank you. The problem I was having according to your information. This is a vacuum system. The pumps are vacuum pumps I was trying to run it without a cover on the intake box. That's the reason why lowered the vacuum to the pumps and calls a lean condition that maybe.

That's the reason why I think it's running out of gas.

Thank you for all your help

[memberson]

Hello,

I'm enjoying your videos, I'm finally getting carburetors right now working on an outboard motor 87 Yamaha 150 it was thought up run good stall after 10 min. I've never rebuilt the carburetors.

I got the boat online, but this year I'm rebuilding the carburetors. It has six of the I'm just replacing the Jets the floats and float needle will this make a difference.

Thank you

[DIOSpeedDemon]

@memberson I dont know anything about boat engines. Two tips I can give you is put a Fuel filter between your tank and carb inlet, because one speck of dirt that screws up on carb, will make the whole thing run really rough. Clean the carbs carefully and NEVER trust a intank fuel filter. Usually a good careful cleaning of the carbs will make them run better, but they have All have to be running in perfect order for the engines to run right. Glad you like the videos, RH DSD

[TheAntdog27]

If you put bigger jets in your carby do you have to retune your bike

[DIOSpeedDemon]

@TheAntdog27 No, What were trying to do is get the bike to run at 14 parts air to 1 part fuel thru out the full throttle range. That is why there are so many different jet sizes and idle jet sizes. RH

[thecarbdoctor]

In the video it's stated that if the air screw is turned out more than three turns than you need a bigger idle jet. This would be true if this were a Idle Mixture Screw on the engine side of the carb but because it's a air adjustment screw on the back side of the carb you actually need a smaller idle jet not a larger one.

[DIOSpeedDemon]

@thecarbdoctor Some carbs adjust air to fuel, some idle screws adjust fuel to air. They accomplish the same thing but you are correct, they are backwards to each other. THere is no way of knowing by just looking at the carb if the adjustment does one way or the other. I will make a clarifing video on this.

[arielmanIan]

@thecarbdoctor

Just to make it a little clearer

If the air screw on the intake side is screwed out you LEAN out the air supply .Turning this screw in cuts off the air supply thus making it richer .EG.If air screw is out more than 1 3/4 turns for highest RPM, a smaller pilot jet should be fitted. If air screw is out less than 1 1/4 turns, a larger pilot jet should be fitted. If the mixture screw at engine side is turned out it makes the mixture richer, screwing in leans it out.

[thecarbdoctor]

@arielmanIan thats exactly right except generally 3 turns is the maximum amount of turns on an IMS on the engine side. I always assumed a Air Screw on the intake side was the same general rule but I maybe wrong.. most bikes I work on have the IMS on the engine side.

[daDfarSpanTaistheKin]

Q #2: what actually the screw controls air or fuel? heard that in 2 strokes it controls air and in 4T fuel, in my carb the screw is on air filter side, so i think it should control the air flow to the pilot circuit? and it is 4T,so in that case turning out allows more air and so leans the mixture,consequently turning in will reduce air and hence richen the mixture

in case that screw controls fuel on turning out it should increase fuel hence richen the mixture and turning in will lean mixture

[daDfarSpanTaistheKin]

thanks for doing this video,, its great pleasure watching it and learning and clearing my cocepts,,,

i got two questions:

1: are the "main jet" and “Needle Jet Holder” onto which main jet is placed a single componemnt , from your video and from other sources i can say that these are seperate,but mine seems to be just one,its a keihin carb,

[DIOSpeedDemon]

@daDfarSpanTaistheKin I will make a video on that and clear that up today. It is hard to make videos with so much knowledge I possess on carbs. I really need to put myself in your position and explain more. I will explain the needle jet, main jet and your great questions on the pilot circuit mechanics. RH DSD

[67kneil]

cool series