To check the wear of the final drive, visually check the pinion (14) and sprocket (17). If the teeth are found to worn as shown in the figure (dotted line), the sprocket must be renewed.
To check the amount of wear on the chain (8), keep the chain taut and measure 16 links.
If the length (l) is greater than 256.5 Mm, the chain should be replaced.
Important
The sprocket (17), engine pinion (14) and chain (8) must all be replaced together as a set.
Removal of the clutch-side crankcase cover
Unscrew the screws (2), (3) and (5) securing the clutch-side crankcase cover
(1).
Tap around the edge of the cover with a plastic mallet to detach it from the
crankcase half.
Remove the clutch cover (1) paying attention to the centring bushing (12).
Check the condition of the cent ...
Spark plugs replacement
Check the colour of the ceramic insulation around the central electrode:
an even, light brown colour indicates the engine is in good condition and
running at the right temperature.
Inspect the centre electrode for wear and check spark plug gap, which should be:
0.8+/-0.1 Mm.
Important
...
Removal of the exhaust system
Remove the silencer, as described in the paragraph "removing the silencer" of
this section.
Loosen the screws (28) and remove the exhaust by-pass valve cover (27).
Turn the exhaust valve pulley (a) to facilitate the throttle cable (25)
output.
Release the end fitting (b) of the cable ...