Question about 2003 Yamaha YZ 125

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Yz 125 2001 model. i went down to the garage and kickstarted the bike she fired up no problem then the engine cut out after a minute now the kickstart is real heavy too push down and will not start, any ideas. thanks

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  • 338 Answers

Sounds like the piston seized.
Pull the spark plug and hand crank the engine if the piston moves up and down with little effort your ok but if you have a lot of resistance top end rebuild needed.

Posted on May 26, 2010

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Posted on Jan 02, 2017

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The cutting out sounds like you are revving above the red line. The red line is there for a reason- this is the engine speed at which the engine is under the most stress. In other words an ocassional trip into this area is not a problem, but continued use in this area will kill the engine. If the bike was mine, I would remove the head and check the piston and barrel. You don't say if the engine will start now. The fact that the kickstarter works now would seem to indicate that the engine is turning over, ( I hope). This should give you some idea at least. If not just ask!

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Check your 2 stroke oil reservoir, got a feeling it's bone dry. If so your cylinder is scored and will need some machining, new piston and rings....Good luck to you friend...Tim

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during the winter you can get build up on the tip of your spark plug that will prevent the engine from firing. remove the spark plug and soak it in gas for ten minutes or so. Dry it ogg with a clean towel reinstall it and it should start right up.

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