YZ125 Top End Rebuild First Start 

This is a 2021 yz125 that needed a top end rebuild.
Old top end had stuck a ring to the piston, and in doing that scarred the cylinder.
Tips for first start ups.
-make sure your jetting is either spot on or even a little on the rich side
-idle the bike for the first start, and if you do give it throttle only so small blips no more than 1/4 throttle
-should only 5-10 minutes until the bike is warm
-you can tell by putting your hand on the radiator, if you can’t hold your hand on the radiator then it’s warmed up
-kill the bike, wait for the entire engine to cool to room temperature and repeat
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