My yz125 dosnt start was running died out when iwas riding started one time sound ruff died
Check the compression with a compression tester. you may have burnt the ring out on the piston. if you don't have a compression tested you should buy one and test is right but if you remove the spark plug and stick your finger over the hole while you push the kick starter down it should force fully push your finger off. if so you have compression if not then you don't have compression and need to redue the top end.
if you have compression check for spark by taking the plug while it is still out and plug it back into the wire and rest the tip of the spark plug or side of it on the head and push the kick starter again. you should see the spark plug spark at the tip. if so it's good and if not you may have a bad coil or something in the ignition system.
but check that and et me know and i can further assist you.
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