General carb tuning, how do i do it?

[TurboMe]

So I need it to be extremely rich up top, kinda rich in the midrange, and 14.7:1 a/f down low... if i leave the pilot jet alone it should leave the down low good and 14.7:1 a/f. now its kinda rich in the midrange but not really rich uptop at this point. So would i want to put a really large main jet in it and drop the needle down a bit? Or would that not give me what im looking for?

Eric

PS- im really bad at tuning carbs so if something i said doesn't sound right, please correct me...

[RD RACING]

it would make life for all alot easier if you could mention a little more in regards to what engine you have and what carby your running. the ratios don,t mean a thing.

[Power Man]

you want your bike to run rich ?

bigger jets, adjust the needle - think you move the clip down so it comes out of the needle jet quicker, adjust air fuel mixture.. ?

this diagram may help you.




let us know what you want it to do.

[TurboMe]

RD RACING - to answer your question its an xr50 engine with a kitaco 88cc big bore, kiehin PB16 with a #38 pilot and a #62 main, stock needle... and most importantly a KP31 turbo out of a diesel smart car.

Power Man - I need it turbo rich! that means whenever its in boost it needs to be more rich than what you would tune it for normally. Normally it would be at aboue 12.5:1 a/f for best power at WOT but with the turbo it needs to be at like 11:1 a/f as to not blow up in my face.... It runs really good down low so i won't be changing the pilot or air fuel screw i don't think. I just need it to be slightly richer in the midrange and then go to full out rich at wot

Oh another quick question... what main jet would be run on a 125 or 140cc engine?

Thanks for your help so far, that diagram is a good baseline

[RD RACING]

105 to 107 main jet for 125 to 138cc with 25 and 26mm carbs.

[TurboMe]

Originally Posted by RD RACING

105 to 107 main jet for 125 to 138cc with 25 and 26mm carbs.

I'm thinking i will try something about that size to start, then go from there with spark plug tuning the WOT.. does that sound about right?

[mso_elite_rider]

u have a turbo on a 88cc bike? would that get any boost at all? i would love to see one on a modded 150cc big bore or something, but didn't know there would be enough exhaust pressure for turbo to operate unless turbo is half size of fist or something do you have any photos im really interested in what it looks like.