03 kx125 problems

[floridakx]

Ok so just a little history on the bike from what I know. I bought the bike about 6 months ago with a brand new fmf fatty pipe and fmf shorty silencer. The guy I bought it from claimed he had his buddy re-jet along with putting on the pipe. The first couple of months it ran fine, a little stutter on the low end but overall good. Over the last 2 weeks it has blown about 5 plugs (ngk iridium). It will start up first kick with a new plug, and run strong for about 10-15 minutes then blows the plug. It will blow the plug randomly everytime :bang: . Ive always used yamalube oil premixed at 50:1 with 93 ocatane fuel. Any information would be great. I have an ok mechanical background and I am way to broke to pay the fees that the shops want around here.. Thanks a lot!

 

[Backslayer]

Do a Search on Jetting in this forum youll find tons of information to get you jetted correctly

 

[Chili]

Well if it was fine and then suddenly changed other than a huge temperature swing having an affect on borderline jetting I'd suspect a crank seal.