Section 04 ENGINE (2-STROKE)
Subsection 05 (TOP END)
SMR2003-010_04_05A.FM 04-05-15
Cylinder Taper
Using a cylinder bore gauge, measure cylinder diam-
eter at 16 mm (5/8 in) from top of cylinder just below
auxiliary transfer port, facing exhaust port and just be-
low the auxiliary transfer port facing the exhaust port.
Compare readings. If the difference between read-
ings exceed specification, cylinder should be rebored
and honed or replaced.
1. Measuring perpendicularly (90 °) to piston pin axis
2. Auxiliary transfer port
A. 16 mm (5/8 in)
Cylinder Out of Round
Using a cylinder bore gauge, measure cylinder di-
ameter at 16 mm (5/8 in) from top of cylinder. Mea-
sure diameter in piston pin axis direction then per-
pendicularly (90°) to it. If the difference between
readings exceed specification, cylinder should be
rebored and honed or replaced.
1. Measuring in piston pin axis
2. Measuring perpendicularly (90 °) to piston pin axis
A. 16 mm (5/8 in)
USED PISTON MEASUREMENT
Note the measurement on the piston dome.
1. Piston dome
2. Piston measurement
A
F01D8AA
1
2
A
F01D8BA
A
1
2
F00D0EA
2 1
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