I just got an 86 250r but is running veary fat. It had a 150 main jet so i keep gong down till it is running good, but that was all the way down to a 118. I know stock is around a 148. The atc has a FMF pipe FMF reads (new) stock cage and a reed spacer. I donot know anythig about the bore thow. With a 118 it runs good not to lean been doing plug checks. So last light i took the carb off to see of I could see anythig wrong with it and there was nothing. I pulled it all a part sprayed brake cleaner therow all the holes no holes where pluged up. But I still want to get a new carb should I go back with the PJ and if so what MM or should i change? and what MM. Thanks for your help

 

how do your reeds look? stock is 145 main and with the reeds and a pipe you should still be around stock.

 

38MM air stryker if you plan on going bigger bore or porting. i ran mine on my ported 250, ran like a champ.

 

Hey man my 1986 TRX is the same way. Stock is 145, and Im down to a 130! At least I dont feel left out anymore lol. Anyways, The keihin PJ carb sucks. Go with the PWK A/S. I would get the 36mm for all around riding, and like HA2 said get the 38 if your going to be adding any mods to it. By the way, you will not regret getting a new carb!

 

thanks for the help I orderd a 35mm PWK lastnight

 

be careful not to lean it out.try removing the spacer plate,with no big modsyou wont need it.