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A
B
ENGLISH
❱❘ Checking the tophigher engine
Inspection of cylinder wear:
Measure the inside diameter of the cylinder when
the cylinder is cold.
• Inspect the inside part of the cylinder for
scratches or any other sign of abnormal wear. If the
cylinder is damaged or severely worn, replace it.
• Since the cylinder does not wear out evenly in
every direction, measure it from one side to the
other and from bottom to top as shown.
If one measure of the internal diameter of the cylin-
der exceeds the service limit, replace the cylinder.
(A)=8 mm
(B)=30 mm
Standard 450 SEF-R:
Cylinder diameter (A) = 94.99 ± 0.012 mm
diameter cylinder (B) = 94.982 ~ 94.995 mm
Conicity limit 0.05 mm
Ovalization 0.05 mm
Piston/cylinder clearance
In order to define the clearance as accurately as
possible, measure the diameter of the piston and
the cylinder separately , and then calculate the
difference between these two values. Measure the
diameter of the piston according to the «Piston
Wear» procedure.
Piston/cylinder clearance:
Standard 0.034 – 0.056 mm
Limit 0.11 mm
Checking individual parts
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