I have a 1998 Honda Xr100 that I bought for my son for his fisrt dirt bike. It has a WhiteBrothers 4-stroke pipe on it and for the life of me I can't get it to run. It starts and idles fine but when I put a load on it it spits, sputters and chokes out. The spark plug is as black as nite. Iv'e come to the conclusion that it's running rich. Everything that I have done jets, big and small just isn't getting it done. Does ANYONE have an answer to help me out before I spend $300.00 at the shop?
put the stock jets in it - or
put the stock jets in it - or open up the air screw some -its not gettin enough air to fuel