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crf 250 wont start
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[QUOTE="yz250il, post: 1090456, member: 71574"] [b]I have the same problem[/b] Hi guys, kinda new here.... So i have a 04 CRF250 i Shimed the intake valves but it wont start at all! Could i be off by 180 degrees with the timing?, i mean the piston is twice at the top position one time it's compressing fuel and air(all valves are closed) and there is an ignition and the second time it's ejecting the burned fuel out from the cylinder(exhaust valves open). If I'm right(and i am off by 180 degrees) then there is a spark every time the piston is at the top and the exhaust valves are open ( that would explain the backfire i had when i tried to bump start it). i guess my question really is, Is there a spark every time the piston is at the top? or only every two cycles . my second question is can a poor timing cause the valves to hit the piston and damage it or brake? thanks Nativ :ride: [/QUOTE]
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crf 250 wont start
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