What's the compression, what do the plugs look like?
How do you know it's 10 degrees?
Is idling horribly, missing, surging, no load RPM increase have big gaps & jumps & not progressive/smooth, exhaust smell worse then sticking your nose into the tank's filler, blowing black smoke: Don't F with jetting?
Cam and/or ignition timing.
Good luck.
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