Stator will stop the cdi from firing the spark plug and either cdi or stator if bad will stop a spark from being created. The coil, wiring, kill switch and other things can also stop ignition spark.
SOURCE: Atomik Pit Bike
After hunting around the web for a few, it sounds like the spring is from the timing chain tensioner. It looks like there is a button on the end of the cylinder, that end goes in first, then the spring. See if the spring is the same on both ends, the picture looks like it's smaller at one end and that end goes into the tensioner, not the bolt. I'll include a screen shot of the picture.
Good luck!
SOURCE: No Spark, No Power coming from CDI to coil
Check the wiring on the connector plugs make sure all the wires are the same color on both sides, red to red blue to blue and so on. I had the same problem After replacing a stator and just plugging it in,after two weeks a new cdi and coil i noticed there were two wires transposed.
SOURCE: 4 stroke 125cc dirt bike only runs when the choke is fully on, stalls when choke is off?
Has it been sitting with gas in it for some time?
Classic gummed up carb symptoms.
My guess is time for a carb cleaning, if not rebuild.
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