engine locked up (05 yz250f) [Archive]

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trx400EXtreme

11-11-2009, 02:37 PM

so.... my buddyn was ridin his 250 to my house and the rear tire locked up completely and now the kick starter wont even rotate the motor. we tried rotating it from the crank and theres nothing. any ideas what might me wrong? i was thinking either the piston seized up or the crank bearings locked up. thanks.

cosinostra

11-11-2009, 06:02 PM

Only way to know is to take it apart..

speedfreek

11-12-2009, 06:24 PM

I would guess the piston seized.

I would first look at the spark plug.

headache

11-14-2009, 08:16 PM

another good High Tech 4 stroke bites the dust... Time to tear it down and empty your wallet lol

axellmusic19

11-15-2009, 02:59 PM

Originally posted by trx400EXtreme
so.... my buddyn was ridin his 250 to my house and the rear tire locked up completely and now the kick starter wont even rotate the motor. we tried rotating it from the crank and theres nothing. any ideas what might me wrong? i was thinking either the piston seized up or the crank bearings locked up. thanks.

Similar thing happened to me in my "has this happened to you" thread. My case was rare but i bet it was the rings or piston. Spark plug and engine cap/dome are the first things to look at. :scary: