NEED your opinions and advice thankyou

[FasterBlaster88]

Hello i recently rebuilt the topend on my 89 blaster tors removed from harness completely aftermarket keihin carb and stock reeds aftermarket DG exhaust stock silencer topend has just been rebuilt at 20 over the bike starts and runs great in nuetral revs out idles no problem yet once its put in gear it loses all power bogs around 3/4 throttle and then starts to buck a bit once its warmed up it lose all power completely i noticed the carb has a 152 main jet in it and that alone sounds way to small im planning on puttting in a 190 through 220 and testing the effects of them yet i would love for anyones input on what it could be or how to fix it .... i also noticed a leak around the bottom of the cylinder gasket probaly is kinked or ripped could this cause this at all as well thank you so much for anyones advice or intput again please help me

 

[Awk08]

yes to the base gasket, thats a major airleak and she's gonna fry very soon if not corrected
was it leakdown tested ? if not seach that word on here, plenty of info to get your motor airtight, until then
you cannot even begin to correctly jet it

i'm guessing by the 152 main # your running a 34mm PJ carb ?, thats the stock trx250r carb and main jet ?
that's gonna be close
the key to getting the keihin carbs to run is a needle change, i suggest the "dgh", some like the "cel" needles

i doubt your jetting is too far off, no need for those huge mains you listed above, especially with only a dg pipe.
those numbers sound like mikuni numbers, keihin #'s are usually between 140ish to 160ish
and pilot jets between 38 and 60

read the mods in my sig below, i'm running a 34mm pj with:
48 pilot
airscrew somewhere around 1-1/2 turns out
"dgh" needle on the middle clip
155 main

 

[Awk08]

btw....from what i've seen, the 28mm kiehins seem to use very similar jetting #'s
45-52 on the pilot and 150 - 160 mains

 

[Blaaster]