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Hello, my 450SXF will not start with the electric start but bump starts and runs completely fine. Valves are within specs, I replaced the exhaust can with the automatic decompression spring and everything. Replaced the starter, and replaced the relay, as well as the freewheel clutch behind the flywheel. Need help please! It cranks over once before getting stuck it sounds like.
 

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Welcome to forum.

What condition is your battery in? If your battery is a fraction weak then the bike will struggle to have enough power for the starter motor AND the ignition. Try to connect the bike to your car battery with jumper leads and see if it starts. If that works, then you might be up for a new battery...
 
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