Suzuki ATV Master!
Join Date: May 2014
Location: Middle of Alaska
Compression? Might be the compression is a bit low. Could be the piston expands as it heats up, so it would get better as it got hotter.
Or it could be a seal/gasket leak that goes away once it heat up.
test compression when cold and hot and see if there is a difference. Compression could be as low as 90 psi and still run. Typical 4 stroke compression should be above 130 psi.
2013 Suzuki King Quad 500 AXi w/EPS
1990 Suzuki LT-4WD 250
and lots of snowmachines