Segway SNARLER ATV 2021 Series Service Manual page 151

Cylinder Compression
◆ The following table should be consulted if the obtainable compression reading is not within the
usable range.
Problem
Cylinder compres-
sion is higher than
usable range
Cylinder compres-
sion is lower than
usable range
Diagnosis
Carbon accumulation on piston, cylinder
head, and in combustion chamber possibly
due to damaged valve stem oil seal and/
or damaged piston oil rings (This may be
indicated by white exhaust smoke).
Incorrect cylinder head gasket thickness.
Damaged or missing compression release
cam spring
Compression release weights do not move
smoothly.
Gas leakage around cylinder head
Bad condition of valve seating
Incorrect valve clearance.
Incorrect piston/cylinder clearance Piston
seizure.
Bad condition of piston ring and/or piston
ring grooves
Compression release weights do not move
smoothly
3-5-41
ENGINE TOP END ENGINE TOP END
Remedy (Action)
Remove the carbon deposits
and replace damaged parts if
necessary.
Replace the gasket with a
standard part.
Replace the spring.
Replace the compression
release unit.
Replace damaged gasket and
check cylinder head warp.
Repair if necessary.
Adjust the valve clearance.
Replace the piston and/or
cylinder
Inspect the cylinder and liner
and replace/repair the cylinder
and/or piston as necessary.
Replace the piston and/or the
piston rings.
Replace the compression
release unit