CHK
ADJ
PERIODIC CHECKS AND ADJUSTMENTS
INTRODUCTION
This chapter includes all information necessary to perform recommended checks and adjustments.
These preventive maintenance procedures, if followed, will ensure more reliable machine operation
and a longer service life. The need for costly overhaul work will be greatly reduced. This information
applies to machines already in service as well as to new machines that are being prepared for sale.
All service technicians should be familiar with this entire chapter.
PERIODIC MAINTENANCE CHART FOR THE EMISSION CONTROL
SYSTEM
• For ATVs not equipped with an odometer or an hour meter, follow the month maintenance inter-
vals.
• For ATVs equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance
intervals. However, keep in mind that if the ATV isn’t used for a long period of time, the month main-
tenance 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.
INTRODUCTION/PERIODIC MAINTENANCE
CHART FOR THE EMISSION CONTROL SYSTEM
TIP
3-1
NO.
ITEM
CHECK OR MAINTENANCE
JOB
INITIAL
Whichever
comes
first
month
1
km
(mi)
320
(200)
1300
(800)
2500
(1600)
2500
(1600)
5000
(3200)
hours
1
*
Fuel line
• Check fuel hoses for cracks or other damage, and
replace if necessary.
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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.
6
*
Exhaust system
• Check for leakage and replace gasket(s) if neces-
sary.
• Check for looseness and tighten all screw clamps
and joints if necessary.
7
Spark arrester
• Clean.
3
1300
6
6
1300
12
20
80
160
160
320
EVERY
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