Introduction
11
Valve lash
Valve lash is the clearance between the top of the valve stem and the rocker arm. The valve lash should be
checked after the first 25 hours of use and every 100 hours after that. Valve lash can be checked and adjusted using
the following steps:
1. If the engine has been run, allow it to cool thoroughly.
Position the equipment for easy access to the cylin
-
der head.
2. Disconnect the high-tension lead from the spark plug
and ground it well away from the spark plug hole.
3. Remove the spark plug using a 13/16” or 21mm
wrench. A flexible coupling or “wobbly” extension
may help.
See Figure 1.11.
4. Disconnect the breather hose from the valve cover.
See Figure 1.12.
5. Remove the five bolts that secure the valve cover
using a 10mm wrench. Remove the valve cover from
the engine.
NOTE: If care is taken not to damage the valve cover gas-
ket, it can be re-used.
Figure 1.11
Muffle
Valve cover
Spark plug socket
Figure 1.12
Breather
hose
spring
clamp
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