Yamaha SR400 - Emission Control System Maintenance

Periodic maintenance and adjustment
6-3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
EAU46862
TIP
 The annual checks must be performed every year, except if a kilometer-
based maintenance, or for the UK, a mileage-based maintenance, is per-
formed instead.
 From 50000 km (30000 mi), repeat the maintenance intervals starting from
10000 km (6000 mi).
 Items marked with an asterisk should be performed by a Yamaha dealer as
they require special tools, data and technical skills.
EAU63321
Periodic maintenance chart for the emission control system
NO. ITEM
1 * Fuel line
• Check fuel hoses for cracks or
damage.

2 Spark plug
• Check condition.
• Clean and regap.

• Replace. 
3 * Valves
• Check valve clearance.
• Adjust.

4 * Fuel injection • Check engine idle speed. 
5 *
Muffler and
exhaust pipe
• Check the screw clamp(s) for
looseness.

6 *
Air induction
system
• Check the air cut-off valve, reed
valve, and hose for damage.
• Replace any damaged parts if
necessary.

X 1000 km
CHECK OR
MAINTENANCE JOB
X 1000 mi
ODOMETER
READINGS
ANNUAL CHECK
1
10
20
30
40
0.6
6
12
18
24
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