8-17
NOTE:
The air filter element should be cleaned every
20 ~ 40 hours. It should be cleaned more of-
ten if the machine is operated in extremely
dusty areas. Each time filter element mainte-
nance is performed, check the air inlet to the
filter case for obstructions. Check the air
cleaner rubber joint to the carburetor and
manifold fittings for an airtight seal. Tighten all
fittings securely to avoid the possibility of unfil-
tered 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, op-
eration without the filter element will affect
carburetor jetting with subsequent poor
performance and possible engine over-
heating.
EBU00754
Spark arrester cleaning
Select a well-ventilated area free of combusti-
ble materials and make sure the exhaust pipe
and muffler are cool.
1. Remove the purging bolt.
1. Purging bolt (
×
1)
2. Start the engine and rev it up approxi-
mately twenty times while momentarily
creating exhaust system back pressure
by blocking the end of the muffler with a
shop towel.
3. Stop the engine and allow the exhaust
pipe to cool.
4. Install the purging bolt and tighten it.
EE.book Page 17 Tuesday, April 24, 2001 9:31 AM
Summary of Contents for BIG BEAR 4X4 YFM40FP
Page 1: ...READ THIS MANUAL CAREFULLY It contains important safety information ...
Page 2: ...WARNING EBU00438 ...
Page 13: ...7 8 EE book Page 4 Tuesday April 24 2001 9 31 AM ...
Page 69: ...EE book Page 13 Tuesday April 24 2001 9 31 AM ...
Page 71: ...7 1 Riding Your ATV EE book Page 1 Tuesday April 24 2001 9 31 AM ...
Page 72: ...EE book Page 2 Tuesday April 24 2001 9 31 AM ...
Page 107: ...EE book Page 37 Tuesday April 24 2001 9 31 AM ...
Page 163: ...1 2 3 4 5 6 7 8 9 10 9 9 13 14 EE book Page 2 Tuesday April 24 2001 9 31 AM ...
Page 164: ...EBU00435 YAMAHA EXTENDED SERVICE Y E S EE book Page 1 Tuesday April 24 2001 9 31 AM ...
Page 165: ...1 2 3 4 5 6 7 8 9 10 9 9 9 14 EE book Page 2 Tuesday April 24 2001 9 31 AM ...
Page 167: ...EE book Page 4 Tuesday April 24 2001 9 31 AM ...
Page 168: ...EBU00437 EE book Page 5 Tuesday April 24 2001 9 31 AM ...