Need Help on My 2010 250 Raptor wont start - Yamaha Raptor Forum
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post #1 of 2 (permalink) Old 11-20-2016, 12:57 PM Thread Starter
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Need Help on My 2010 250 Raptor wont start

2010 Yamaha 250 Raptor

I was changing out the starter motor and starter gears. Had to remove the timing chain tensioner to make room to put in the new starter. when I put the quad all back together it started up an ran good for a little bit. Then made some raddling sounds and stalled. I tried to crank the engine over again but sounds like its not getting any compression. Pulled out the spark plug and looked in the hole. The piston does remove up and down like it should. so I know its not seized up or broke the piston rod.

Any ideas on what maybe going on please let me know and what I could look at to get it up an running again
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post #2 of 2 (permalink) Old 11-24-2016, 09:45 AM
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If the timing chain wasn't lined up correctly, you could have had piston to valve contact. The result being bent valves and some piston damage. Do a compression check to find out.


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