My 125 4stroke cuts out when going to rev or pull away was out on it to day it backed fired then cut out it took few kicks to get started again when it dose start it cuts back out it has good spark and new carb new air filter could it be the piston/rings or any thing like that
Pull cover on magneto and check for loose pickup coil.
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: got spark compression and gas but bike wont start!
Check to see if the ruin burton is on, if so out could be the switch isn't altering the connection to go the plug.
SOURCE: ENGINE REVS
Check to see if ur throttle isn't getting stuck or has gunk/rust that might b preventing ur throttle to return to its original position also check the cable its self u might have a kink on the line wich may prevent retraction Also check ur handle and make sure its not sticking Their could b other problems but for now check ur throttle cable
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