31
ST SERIES
ENGINE PARTS CHECK
❱❘ Crankshaft width measure
• Using a vernier caliper, measure the distance
between both crank webs.
Value :
125cc
56mm +0 / -0.2
250cc / 300cc
56mm +0 / -0.2
❱❘ Big-end radial play
•
Put the crankshaft on machinist V-blocks and
place a dial gauge
1
against conrod big end
• Push the conrod big end toward the gauge,
then outwards. The difference between those two
measures means the radial play
• Radial big end play :
Standard : 0.003 mm – 0.013 mm
If the radial play is beyond the maximum, the
conrod kit must be replaced.
❱❘ Axial play of the big end
• Using thickness gauges, measure axial play of
the big end.
Axial play of the big end:
Standard : 0.6 mm – 0.8 mm
Maximum limit: 0.9 mm
If the conrod axial play is beyond the limit, replace
the conrod
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