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Discussion Starter · #21 · (Edited)
Okay guys so I really need some help with my jetting on my 86 250r I got a fresh top end, borded 20 over an ported by eric gorr racing with v force 3 reeds has a fmf fatty gold series pipe with silencer uni air filter in stock air box I tried with lid an no lid with a 38mm a/s carb I got a 48 pj an a 175 main with a jd jetting needle on the middle clip it idles an runing good till about 3/4 to all out then it sputters an bogs I got the air fuel screw 1 1/2 out I ride at sea level an it's always about 65 70 temp
i would go up to like a 178mj and see if it gets better or worse. if it gets worse i would drop the mj by 1 to a 172, then try a 170. my guess is you will jet in around 168mj. always go up before you go down for safety reasons. a lean top end will usually scream scream till a certain point where it cuts out from fuel starvation then burn it up. please let us know how it turns out. thank you
 

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So just confirming
the lower letter richer it is but top end is opposite?
C is a leaner than d?
misprint or how it is?? Thanks
 

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Discussion Starter · #23 ·
just dropping in to see if people are still using my charts and old knowledge.....
 

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i have bdt prejet mi carbs.


i have the best. bdt built engines.
bdt261 oem
bdt363 prox
bdt431 puma
bdt561 saber
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