Massimo MSU 400, Owner'S Manual, Page: 131 / 179

8-30 Periodic Maintenance and Adjustment
air filter element maintenance is performed,
check the air inlet to the air filter case for
obstructions. Check the air filter element
rubber joint to the throttle valve and manifold
fittings securely to avoid the possibility of
unfiltered air entering the engine.
CAUTION:
Never operate the engine with the air filter
element removed. This will allow unfiltered
air to enter, causing rapid engine wear and
possible engine damage. Additionally,
operation without the air filter element will
affect throttle valve jetting with subsequent
poor performance and possible engine
overheating.
Cleaning the Spark Arrester
Be sure the exhaust pipe and muffler are
cool before cleaning the spark arrester.
1. Remove the bolts.
1 、 Bolt （× 3 ）
2. Remove the tailpipe by pulling it out of the
muffler.
3 ． Tap the tailpipe lightly, and then use a wire
brush to remove any carbon deposits
from the spark arrester portion of the