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06 yfz 12.5-1 compression

799 views 2 replies 2 participants last post by  Sheerider11 
#1 ·
https://vimeo.com/180218589

My friends 06 yfz 450 with a 12.5-1 compression
Any ideas on what is the problem
Thinking it is valve adjustment or carb


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#2 ·
Bump there is supposed to be a video if you can see it
But the problem is at like 1/4 throttle it falls on its face and backfires like crazy and runs really hot but it ran fine the day before i cleaned all the jets and there was no dirt in the carb he also runs a fuel filter.


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