BOMBARDIER Johnson 90 Service Manual page 202

POWER UNIT
CYLINDER / CRANKSHAFT / PISTON
3. Calculate the piston / cylinder clearance (Clearance
equals difference between pisten diameter and cylinder
bore measurements).
Piston to cylinder clearance:
Standard: 0.020-0.040 mm (0.0008-0.0016 in)
Service limit: 0.100 mm (0.0039 in)
lf clearance exceeds service limit, replace piston and/or cyl­
inder or rebore cylinder.
ldentification of oversize piston / piston ring
Two oversize piston / piston ring components, 0.25 mm and
0.50 mm, are available. Oversize piston / piston ring are
marked as shown below.
• Piston
0versize
1.0. mark
0.25 mm 0.25
0.50 mm 0.50
• 1 st and 2nd Piston rlng
0versize 1.0. mark
0.25 mm 25
0.50 mm
50
• Oil ring
0versize 1.0. mark
0.25 mm
Two (2) blue paints
0.50mm Red paint
I.D. mark
0.25
or
o.so
1st, 2nd ring
011 ring spacer
6-48