47
ST SERIES
ENGINE ASSEMBLING
• Place inside
7
and outside
8
O-rings.
• Place the two dowel pins
9
• Fit the combustion chamber
q
and its O-ring
w
.
❱❘ Squish check
•
The squish check is carried out measuring the distance between the piston crown , at Top
Dead Center, and the combustion chamber.
•
As a reference, fit a 0,5mm thick base gasket.
•
Place a bit of tin wire on the piston crown, parallel to the wrist pin.
•
Fit the cylinder head, tighten the screws.
•
Rotate the crankshaft to make sure the piston moves past Top Dead Centre
•
Remove the combustion chamber, and measure the tin wire thickness.
125cc 250cc 300cc
Min. Squish
0.9 mm
1.25 mm
1.25 mm
Max. Squish
1.00 mm
1.35 mm
1.35mm
• Fit the cylinder head cover and its 6 screws
e
,
with new copper washers, cross-tighten the
screws at a 10Nm torque.
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