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Hello Thumbertalk!

I have a question about my yz250, just got the cylinder back from the shop where it got bored.

i have put it back together and when im kicking it it won't start it just backfires.. it started before it got bored so?

I have cleaned the carb and put a new plug in but it still backfires like hell.. i just don't know what to do..

my ignition coil is from a Yamaha dt 175 because the original one was completly destroyed when i got it 🙂

 

 

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Something you might check is to see if the key on the flywheel is sheared or moved.  Sounds like you have spark, just at the wrong time.  CDI or flywheel timing.  

 

OH! might check to see if the timing has slipped too.

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