PISTON AND CYLINDER
38 – English
Piston and cylinder
1. Remove the following components:
•
Cylinder cover. See instruction book.
•
Spark plug. See instruction book.
•
Carburettor. See page 28.
•
Silencer. See page 14.
2. Remove the impulse hose (A) from the hole on the inlet
manifold. See fig. 1.
3. Detach the anti-vibration springs (B) from the cylinder.
See fig. 1.
4. Undo the four cylinder retaining bolts (C). See fig. 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. See fig. 2.
7. Remove one of the piston circlips, press out the gudgeon
pin and remove the piston. See fig. 2.
8. Remove the needle roller bearing from the connecting
rod little end.
9. Unscrew and remove the decompression valve (D).
See fig. 1.
10.Undo the clamp bolt and remove the inlet manifold.
Fig. 1
Fig. 2
Fig. 3
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 cylinders surface coating is not worn out, especially
the upper part of the cylinder. See fig. 3.
Cleaning and inspection
B
A
C
D
