crf 450 wont start

I have tried everything that you would normally check sparkplug , spark etc.. it will backfire occasionally but i am no 4stroke mechanic It just annoyes the heck out of me

valves?

You need to be more specific....how old is the bike, how much maintenance do you do , have you had it very long, what is your starting proceedure, is this a first time symptom etc...etc...??? Ciao JP :cry:

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