Service manual

ENGINE MEASUREMENTS
Page C-4
Engine Shop Rebuild and Parts Manual
A
B
C
A
1
1
A
2
C
1
C
2
2
B
1
1
B
2
2
Measure each position in
the cylinder bore at 2 places
Cutaway view of crankcase at cylinder bores
Crankcase
90
o
2.519"~2.520" STD.
295cc 350cc
2.6378"~2.6385" STD.
(67.000mm~67.019mm)
If "A " exceeds "C ", or if "A " exceeds
"C " by 0.004" (.1mm), rebore the cylinder.
(64.000mm~64.019mm)
Cylinder bore dimension is determined by
size of the piston to be used. If over size
piston is used, "C" represents specified
bore for that piston. Relative dimension
for "A" remains valid.
.25mm and .50mm oversize
pistons are available.
telescoping
gauge
A fine cross-hatched surface
is the proper finish for a
cylinder bore.
Detail A
Fig. C-3 Crankcase Cylinder Bores