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Service Manual
TC-355
General Inspection Cont.
Choke Lever
Check to ensure that the choke lever (A) is able to rotate freely
within the air cleaner body, and that it has not been bent as to
prevent a good seal when closing over the air intake.
Spark Plug
Remove the spark plug rubber protection boot and high-tension lead,
and remove/inspect the spark plug.
Picture A depicts a spark plug that has a broken insulator. Picture B
depicts a spark plug that has fouled due to a rich fuel/oil mixture.
Picture C depicts a plug that has fouled due to carbon build-up. All of
these conditions will prevent the spark plug from functioning properly,
and will require replacement.
Picture D depicts a plug characteristic of healthy running conditions.
The electrode should have a golden/tan color, and no damage is
present.
Whenever the integrity of a spark plug comes into question, it should
be replaced. Whether the plug to be installed is new, used or cleaned,
it should be checked for correct electrode gap, which is .024”.
Cylinder Compression
Insert a compression gauge into the empty spark plug hole and
pull the recoil starter handle briskly several times, until the
needle on the gauge stops climbing. This reading represents the
compression in the cylinder, and is a good gauge of the piston
rings ability to hold pressure. The unit will struggle to run with
compression less than approximately 90 psi. Such low readings
indicate the need for service to the cylinder, piston or piston
rings.
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