PISTON AND CYLINDER
English – 39
Fig. 1
Fig. 2
Fig. 3
Piston and cylinder
1. Remove the following components:
• Cylinder
cover.
• Spark
plug.
• Carburettor.
• Silencer.
2. Remove the impulse hose (A) from the hole on the
inlet manifold. See fi g. 1.
3. Detach the anti-vibration springs (B) from the
cylinder. See fi g. 1.
4. Undo the four cylinder retaining bolts (C). See fi g. 1.
5. Lift off the cylinder carefully.
Dismantling
NOTE!
Ensure that no dirt or other foreign particles
fall into the crankcase.
6. Cover the crankcase opening immediately with
paper or clean rag.
7. Remove one of the piston circlips, press out the
gudgeon pin and remove the piston. See fi g. 2.
8. Remove the needle roller bearing from the
connecting rod little end.
9. Unscrew and remove the decompression valve (D).
See
fi g. 1.
10. Undo the clamp bolt and remove the inlet manifold.
Clean all components, scrape off the remains of any
gasket material and scrape off the carbon deposits from
the following surfaces:
1. The piston crown.
2. The top of the cylinder bore.
3. The cylinder exhaust port.
4. The decompression valve channel.
Check the following:
1. The c ylinders sur face coating is not worn out,
especially the upper part of the cylinder. See fi g. 3.
Cleaning and inspection
