20 Most Recent 2006 Yamaha yZ 250 F Questions & Answers

It sounds like you aren't getting gas.
Make sure that the fuel line is delivering fuel.
Disconnect the fuel line, get a safe container, no smoking, turn engine over and ensure gas flow.
Gary

Question edited for clarity, and add maker, toss in some CAPS. Question moved to model category. Mating surfaces not flat and true. Reinstalled without a new gasket. Under torqued or unevenly torqued. No gasket goo used. https://www.google.com/search?q=2001+Yamaha+YZ250F+valve+cover+gasket+leak ..

Edited text to reflect the make and capitalization of model number. Put post format into correct order (year make model 'what it is', the question), plus it is a motorcross bike. Moved to the correct Category. Page 239 of the Service Manual. https://www.manualslib.com/manual/839179/Yamaha-Yz250f.html?page=239&term=fork+oil&selected=13#manual ..