Yamaha BIG BEAR 250 YFM25BZ, Owner'S Manual

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8-3
8
EBU21743
Periodic maintenance chart for the emission control system
TIP
● For ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals.
● For ATVs equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance inter-
vals. However, keep in mind that if the ATV isn’t used for a long period of time, the month maintenance
intervals should be followed.
● Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools,
data and technical skills.
NO. ITEM
CHECK OR MAINTENANCE
JOB
INITIAL EVERY
Whichev-
er comes
first
month 1 3 6 6 12
km
(mi)
320
(200)
1300
(800)
2500
(1600)
2500
(1600)
5000
(3200)
hours 20 80 160 160 320
1 * Fuel line
• Check fuel hoses for cracks or other damage, and
replace if necessary.
√ √ √
2 Spark plug
• Check condition and clean, regap, or replace if
necessary.
√ √ √ √ √
3 * Valves • Check valve clearance and adjust if necessary.
√ √ √ √
4 * Carburetor
• Check starter (choke) operation and correct if nec-
essary.
• Check engine idling speed and adjust if neces-
sary.
√ √ √ √
5 *
Crankcase breather
system • Check breather hose for cracks or other damage,
and replace if necessary.
√ √ √
U1P065E0.book Page 3 Monday, August 31, 2009 1:10 PM