52 – English
Repair instructions
Faults and causes
Score marks on the piston (A).
1. Leakage, check not carried out.
2. Too low octane rating in the petrol.
3. Too little or incorrect oil in the fuel.
Carbon deposits (B)
1. Too much or incorrect oil in the fuel.
Piston ring breakage
1. Piston ring worn out.
2. Oversized piston ring groove.
Fig 77
7.25 Assembling the piston and
cylinder
1
Oil the gudgeon pin bearing with two-stroke oil and
t it to the connecting rod.
2
Fit the piston with the arrow facing the exhaust
port, slide in the gudgeon pin and t the circlips in
place. See Figure 78. NOTE! Use new circlips.
3
Oil the piston and piston ring with two-stroke oil.
4
Lubricate a new cylinder base gasket with chain-
saw oil and put it in place. Compress the piston
ring and carefully push the piston into the cylinder
opening. See Figure 79.
5
Attach the cylinder. The cylinder screws must be
tightened crosswise with a tightening torque of
6.9 - 8.8 Nm.
Assemble the saw by following the steps in the
chapter 7.24 Dismantling the piston and the cyl-
inder in the reverse order. Make sure to use the
correct torque. See Service data.
Fig 78
Fig 79
To Next Page
Loading...
