is anyone using a Keihin PE 20mm carb on their bikes and if so what is your jetting combos for MJ and PJ??

 

I'd like to know too cuz I'm ready to throw the junker from TB in the garbage

 

yeah i got the keihin but cant get the carb dialed in its not junk, just cant figure it out

 

their supposed to be easy to tune but a few more things than main, pilot jet and air/fuel screw.

what problem are you having? are you tuning off of plug reading?

 

im just trying to find a good starting point cuz 38pj and 90 mj was all screwed up ran like crap had super bad low end bog so i went to the 58 pj that the carb comes with and the low end bog is gone but i think 58 pj may be too much cuz once its warmed up it dont idle or run smooth what kind of set up are you running on your 88

 

I've got the 20 mil chinese junker that comes with the tb stage iii 88 kit. it gets the job done.

If I were you I'd start with the bike at temp and get it to idle then move on to the low end bog and then 3/4 to wot.

what's your setup?

 

tb stage 1 kit, 20mm keihin carb plus intake and i ported the head to match the intake, stock pipe with spark arrestor and baffle removed, besides that motor is stock

 

currently im running 88mj and 58pj i know the pilot is too big but its what the carb came with stock and with the 58pj it has zero low end bog

 

so low end bog is gone, what's it doing up top? where'd you get the carb? I'm ready to order one.

 

yeah going to do a few changes tonight and stunt it a lil up top its doing that weird rev limiter thing where its geting to much gas and not letting it rev out to the actuall rev limiter i got the carb for a local fiddy shop here in the city

 

put that 100 mj back in sounds like it's lean up top. get a jet kit and make slow changes. don't change the main and pilot at the same time, do one or the other cuz you'll be chasing both. you'll sneak up on the tune with slow changes.

 

going to take down the pj a few sizes i think thats my problem, the 100 mj made it run like crap, im just trying to lean it out the friggin thing runs so rich, plug is always sooty black

 

mine did the bog really bad when it was lean and would rev but not make power when it was pig rich. can you get a jet/pilot jet kit? I went rich then slowly leaned it out til it was snappy and the plug looked good. I'll probably be re-jetting it in 2 months when it gets warmer.

 

Did you port your stock head out any. Cuz I did a lil and I'm thinking that's why I'm having a beotch of a time getting the jetting right I may have open the intake up too much

 

I have the race head and cam from TB. re-jet your stock carb and try it, might work better with your setup.

 

I ran great with the stock carb but made no power Just need to get off my lazy butt and buy some pilot jets

 

I've been playing with the sheng wey carb that comes with the tb kit. the plug is either white or black no in between and there's a stumble between 1/8 and 1/4 throttle. I'm gonna mess some more after dinner and see what I can do. if i can't get the stumble gone I'm buying a keihin

 

what size jets you running in that carb now

 

90 main, 38 pilot

I messed with the needle position a little bit tonight but ran out of time to keep messin. Tomorrow I'll put a new plug in and see what I can do.

 

90mj 50pj and 2nd clip on needle runs great can anyone understand why my bike runs good with this jetting combo?????