50
7. REPLACING THE PISTON RINGS
The piston rings have to be replaced should the gap exceed 0.8 mm (0.031 in.),
the correct gap being 0.2 mm (0.008 in.). To check the gap width insert the
removed piston ring into the cylinder top part (approx. 10 mm. (0.39 in.) deep),
and check gap by means of a feeler gauge. The best way to remove the position
rings is to use three thin steel strips. Insert one strip under the piston ring in the
middle and the two others under the piston ring ends. To replace the piston rings
proceed in the same manner.
8. REMOVING THE CARBURETER
a) Disconnect the fuel pipe where it joins the fuel tank.
b) Loosen the carburetter cover unscrewing the fastening nut off the mixing
chamber.
c) Remove the cover and slacken the flange fastening nuts.
d) Push the carburetter out rearwards,
e) When removing the carburetter leave the induction Silencer in its place
disconnecting only the rubber sleeve.
Fig. 12 Removing the cylinder barrel
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