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View Full Version : need help! 86 250R



flywheel
04-22-2009, 11:45 PM
I am going to rampage 09 tomorrow and i just got my 86 R up and going today after a build from front to back it is a stock bore and stroke with a cool head that has a 20cc chamber in it and i put the cr250R head gasket for more commpression it also has Boyesen reeds,34 or 36mm Kehien pj flat slide carb i think its stock 34mm it has a #148 main jet and #42 slow jet,K&N filter,FMF Gold series pipe,FMF silencer. It ran great the first couple rides then it fouled the plug looked gas fouled or just real rich through a new plug in it ran fine road for 20min or so killed it tried again after an hour ran fine for a sec then just craped out i pulled the plug and it wasnt as bad but still looked rich,not sure where to go from here i have good fuel supply to carb i have spark any help would be greatful or if any one that is going to rampage 09 has some jets they could bring let me know Thanks

CeaserTheThird
04-23-2009, 03:50 PM
Why don't you go buy some Jet's ? ? ?

Just take the Main jet Out and drive down to your local ATV store, Hand Them the Jet.

Get a - 145 , 142 , 140 . and a few more spark plug's .

Also Try removing the Air Box Lid see if it help's !

dads
04-23-2009, 03:58 PM
is the rich/lean screw set ? what oil mix are you running ? what are the stock jet sizes for the original carb.