Assembling The Piston And Cylinder - Husqvarna 445 Workshop Manual

Faults and causes
Score marks on the piston (A)
1. Incorrect carburettor setting. Too high over-
speed.
2. Too low octane fuel.
3. Too low or incorrect oil in the fuel.
Carbon build-up (B)
1. Incorrect carburettor setting. Too low over-
speed.
2. Too much or incorrect oil in the fuel.
Piston ring breakage
1. Excessive engine speed.
2. Piston ring worn out.
3. Oversized piston ring groove.
(see figure 5 )
7.23 i t n an c lin er
1
Lubricate the little end bearing with two-stroke oil
and insert it in the connecting rod. (see figure 58)
2
Fit the piston with the arrow pointing towards the
e haust port. Push the gudgeon pin in and fit the
circlips. NOTE! Use new wire fuses. (see figure
59) f replacing the cylinder fit the decompression
valve, tightening to a torque of 12–14 Nm.
3
Fit the intake manifold on the cylinder, with insula-
ting plate (4 screws).
4
Lubricate the piston ring and piston with two-stroke
oil.
5
Fit new cylinder base gaskets. Lower the cylinder
over the piston carefully.
6
Fit the cylinder bolts, tightening them in diagonal
pairs to a torque of 13–15 Nm.
NOTE!
It is very important that there are no leaks
in the inlet te
a ei e
refitting
ther i e the engine
A
Fig 57
Fig 58
Fig 59
Repair instructions
B
47
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