KTM Motorcycles - Page 5 - Recent Questions, Troubleshooting & Support

Hey Anon, Run a compression check..screw the compression gauge into the head until the o-ring seats..( a coat of oil on the o-ring helps) hold the throttle wide open and kick it over about 6-8 times HARD.. you should get at least 120psi..if it is lower than 110psi you need to find out why... if you don't have the tools/knowledge/experience .. .. take it to a qualified pro...

Did you adjust the clutch cable? Have you replaced the springs in the clutch baskit with new one?

Any chance there was any old fuel left in the tank when you started messing with it. Most fuels have ethanol blended into them. After about 2 months ethanol blended fuels go through a phase separation... meaning the ethanol separates from the fuel and starts eating it's way through just about anything made out of rubber. I had an old work chainsaw that sat with a tank full of fuel for about 2 years. When I picked it up the fuel filter was rattling around inside the tank ... the hose had completely dissolved. The short section of fuel line between the tank and carb was like putty. In your case, I would want to make sure all the old fuel was drained out of the lines before tearing into anything else.