Question about 2004 Yamaha YZ 450 F

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Snow thrower won't start.

MDT single stage snow thrower - while moving snow small metal bits kicked out, likely from edge of acumulator - engine started to run away - shut off - now will not start - and the choke 'feels' loose. I use pull start - after 3-4 pumps it usually starts. The pressure when I pull start feels right. Have not tried electric start. I think it is the choke but unable to pin-point. Help !!

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Could possibly be the governor it may have contacted the flywheel if it has came apart under the flywheel cover  are the metal fragments easy to pick up with a magnet or  are the aluminum ?  if they are not picked up by a magnet  your problem lies  else wear  

Posted on Feb 16, 2009

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I have 2004 TTR-125 and the kick start has a problem... When you try to kick it it makes a grinding sound... and some times when you kick it it makes the regular kick sound but only does it half way down...


It sounds like you have damage to the gear on the kicker shaft or an idler gear that rides on it or both. Either or there is likely metal bits loose inside the engine.
Pull the spark plug and with the ignition off work the kickstart through it's paces and see if you can kinda tell things about whats going on. Is the nasty sounding bit always in the same spot as the crank rotates...hard to tell but suffice to say if you're hearing nasty gronching noises and meeting resistance when kicking you got trouble inside. If you meet any serious resistance I wouldn't push it.
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Lbwhit the whole engine seized, you can't kick start it, the kick start won't move. engine does not turn over, push start does not work


Pull off the cylinder head. Look in the bore. Can you see seize marks on the cylinder? Nine chances out of ten you are going to have to remove the cylinder anyway, so go ahead and do it now. Did the piston seize up? Remove the left side cover. Rotate the flywheel. Crankshaft free to move now?

If not, drain the oil and look at it. Any metal shavings, cork or bits of ground metal in it? Remove the left side cover. Look at the kick start gear. Is it "locked up" in the clutch hub? Remove the clutch hub. Will the crankshaft turn freely now? Put the bike on blocks and turn the rear wheel. Will it turn? While the wheel is turning, can you shift into neutral? When in neutral, can you hold the clutch shaft still while the wheel turns? Any funny noises while the wheel turns?

The piston may have seized the engine. The kick start mechanism or a bent shift fork may have locked up the engine. Gremlins may have done it. Something did, so let's find out what.

Please rate this solution. Thanks!

Apr 05, 2009 | 2004 Yamaha YZ 125

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