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Repair instructions
Piston and cylinder – refitting 346XP,
350, 351, 353
1
Fit the piston with the arrow pointing towards the
exhaust port. Push in the gudgeon pin and fit the
circlips. If replacing the cylinder, fit the decompres-
sion valve, tightening to a torque of 12–14 Nm.
3
Lubricate the little end bearing with two-stroke oil
and insert it in the connecting rod.
2
Fit the inlet manifold 503 86 63-01 to the cylinder.
Check that the impulse tube is correctly seated in
the impulse channel.
NOTE!
It is very important that there are no leaks
in the inlet system, otherwise the engine
may seize.
Press the insulating plate 503 86 62-01 onto the
cylinder. Check that the impulse tube connected to
the insulating plate is seated correctly in the inlet
manifold and lock the clamp over the manifold.
5
Lubricate the piston ring and piston with two-stroke
oil.
6
4
Fit a new cylinder base gasket. Compress the
piston ring with tool 502 50 70-01 and lower the
cylinder over it carefully.
7
1
2
3
4
Fit the cylinder bolts, tightening them in diagonal
pairs to a torque of 8–10 Nm.