Section 04 ENGINE (2-STROKE)
Subsection 04 (TOP END)
F00B09A
1
2
1. Use the micrometer to set the cylinder bore gauge
2. Dial bore gauge
F00B0AA
1
1. Indicator set to zero
Position the dial bore gauge at 16 mm (5/8 in) be-
low cylinder top edge.
F01D0KA
1
A
1. Measuring perpendicularly (90°) to piston pin axis
A. 16 mm (5/8 in)
Read the measurement on the cylinder bore
gauge. The result is the exact piston/cylinder wall
clearance.
NOTE: Make sure the cylinder bore gauge indica-
tor is set exactly at the same position as with the
micrometer, otherwise the reading will be false.
Ring/Piston Groove Clearance
717 and 787 RFI Engines
Using a feeler gauge, check clearance between
rectangular ring and groove. If clearance exceeds
specified tolerance, replace piston.
NOTE: Ring/piston groove clearance can be cor-
rectly measured only on rectangular ring which is
bottom ring.
F01D0XA
1
2
1. Feeler gauge
2. Rectangular ring (bottom)
smr2004-Complete Line Up 115
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