54 - English
Faults and causes
Score marks on the piston (A)
1 Leakage, check not carried out.
2 Too low octane fuel.
3 Too low or incorrect oil in the fuel.
Carbon build-up (B)
1 Too much or incorrect oil in the fuel.
See Figure 63.
Piston ring breakage
1 Piston ring worn out.
2 Oversized piston ring groove.
7.23 Assembling the piston and cylinder
1
Oil the gudgeon pin bearing with two-stroke oil and
insert it into the crank rod. See gure 64.
2
Replace the piston with the arrow facing the ex-
haust port, and slide in the gudgeon pin and t the
circlips. NOTE! Use new circlips. See gure 64, 65.
3
Oil the piston and piston ring with two-stroke oil.
4
Put a new cylinder base gasket in place. Apply
silicone (Order No. 503 26 72-01) on the gasket
according to gure 64b. Compress the piston ring
and carefully push the piston into the cylinder
opening.
5
Attach the cylinder. The screws must be tightened
crosswise with a tightening torque of 8-10 Nm.
NOTE!
It is very important that the intake system is
sealed. Otherwise the engine may seize up.
Fig 63
Fig 65
Fig 64
A
B
Repair Instructions
Fig 64b
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