Tanaka MOBY XL Service Manual page 9

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Moby XL, SE-803
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 Arrestor Screen
Remove the spark arrestor retaining screw and holder. Remove any
carbon deposits from the screen. If the screen has heavy deposits of
carbon build-up, replace it with a new part.
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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Service Manual
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