It has compression and spark but wont start before when it was running it back fired every once in a while and then just died
SOURCE: 1997 yz 125 wont start, please help
2 stroke bike are very dependent on compression. and being a bike that is 12 years old my best educated guess is that the top end needs to be rebuilt. i usually have to have the top end done on my honda about every three years.
SOURCE: new top end but no compression or very little
Sounds like you have the crank to cam timing incorrect. Also you may have the valves set too tight. Dose it pop and sputter?
SOURCE: bike only fires once
Okay, let's have a look at it. Say Ahaaa.
The probable cause of the problem is not the spark. Get a fresh set of Stock NGK spark plugs, ground the plus to the engine, and check each cylinder for spark as the starter button is pressed for 3 seconds or so. I will wager that the spark is present.
The likely problem is the fresh gas was put into a very rusty gas tank. Bits of rust now inhabit your carb and are having fun plugging up the carb. Look at the gas valve. With a little luck there is a small bowl behind the valve. Remove it and tell me what you see in the bowl.
SOURCE: can't keep running seems to flood out 1978/79 kawasaki
seems your fuel to air mixture is wrong
SOURCE: suzuki gn125 wont start. checked carb, cdi, coil.
Check the valve adjustment. If a valve is standing open just a little, the compression will be too low to start the engine. Check fuel delivery by dribbling a little gasoline into the carb and try starting the bike. If it starts and runs for a second or two, you're not getting fuel into the cylinders. Check you carb again.
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