Jonsered CS 2240 User Manual

Page 46

English –

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 59)

7.23 Piston and cylinder – refitting

Lubricate the little end bearing with two-stroke oil

and insert it in the connecting rod (see figure 60).

Fit the piston with the arrow pointing towards the

exhaust port. Push the gudgeon pin in and fit the

circlips. NOTE! Use new wire fuses

(see figure 60).

Fit the intake manifold on the cylinder, with insula-

ting plate (4 screws).

Lubricate the piston ring and piston with two-stroke

oil.

Fit new cylinder base gaskets. Lower the cylinder

over the piston carefully.

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 system, otherwise the engine
may seize.

Repair instructions

Fig 59

Fig 60

Fig 61