Ok guys go this 4 wheeler in a trade, owner said it died in a mud hole.

Symptoms:
No start
compression comes out of crankcase vent
does not hit at all, Maybe a little bit of fire if I choke it

troubleshooting done:
carb cleaned, all jets removed… its 100%
Have spark
verified rotor is at tdc when piston is
adjusted valves

what ive found:
Cam sprocket is 1 tooth advanced
piston seems to have some dirt and grime on top of it
intake does not have any vacuum when the motor is spun over
80% of compression comes out of crank case vent

so should i set the motor back in time or maybe the previous owner advanced a tooth for more power?
I may need to just pull the top end and make sure everything is good… IDK any thoughst?

Ok guys go this 4 wheeler in a trade, owner said it died in a mud hole.

Symptoms:
No start
compression comes out of crankcase vent
does not hit at all, Maybe a little bit of fire if I choke it

troubleshooting done:
carb cleaned, all jets removed… its 100%
Have spark
verified rotor is at tdc when piston is
adjusted valves

what ive found:
Cam sprocket is 1 tooth advanced
piston seems to have some dirt and grime on top of it
intake does not have any vacuum when the motor is spun over
80% of compression comes out of crank case vent

so should i set the motor back in time or maybe the previous owner advanced a tooth for more power?
I may need to just pull the top end and make sure everything is good… IDK any thoughst?