NOTICE:  The "Periodic Maintenance / Lubrication Intervals" schedule is taken directly from a 1984 edition Yamaha XC125 factory service manual. Before starting any work, always consult the manual for your scooter's model & year.

XC125 Periodic Maintenance / Lubrication Intervals
Item Remarks Type Initial
1,000 km (600 mi)
or
1 month
Service 1
4,000km
(2,500 mi)
or
7 months
Service 2
7,000 km (4,400 mi)
or
13 months
Service 3
10,000 km (6,300 mi)
or
19 months
13,000 km
(8,200 mi) or
25 months
Engine Oil Warm up engine before draining 1.0L (1.1 qt) SAE 10W30 or 20W40 motor oil
X
X
X
X
X
Air Filter* Wash & dampen with oil Yamalube 2-cycle or equivalent X X X X X
Crankcase filter* Wash & dampen with oil Yamalube 2-cycle or equivalent - - - X -
Brake system* Adjust free play. Replace shoes if needed - X X X X X
V-Belt* Check for cracks and wear. Replace if necessary. Replace every 11,400 mi (18,000 km) - - - X - X
Final gear oil (sub transmission oil) Replace 0.15 qt (0.14 L) SAE 10W30 motor oil
X
-
-
X
-
Control and meter cable* Apply chain lube thoroughly Yamaha chain and cable lube or SAE 10W30 motor oil
X
X
X
X
X
Brake lever pivot shaft Apply chain lube lightly Yamaha chain and cable lube or SAE 10W30 motor oil
-
X
X
X
X
Brake pedal shaft Lubricate. Apply chain lube lightly. Yamaha chain and cable lube or SAE 10W30 motor oil
-
X
X
X
X
Center/side stand pivots* Check operation and lubricate. Apply chain lube lightly Yamaha chain and cable lube or SAE 10W30 motor oil
-
X
X
X
X
Front fork oil* Check operation and leakage
-
-
X
X
X
X
Front brake tension-bar pivots and bottom link pivots* Apply until new grease shows Lithium soap base grease
-
-
X
-
X
Front axle* Apply grease lightly Lithium soap base grease
-
-
X
-
X
Steering Bearings* Check bearings assembly for looseness. Moderately repack 15,000 km (9,500 mi) Medium weight wheel bearing grease.
-
X
X
X
X
Wheel bearings* Check bearings for smooth rotation. Tire pressure F 22 psi, R 28 (36 max) psi
-
X
X
X
X
Battery Check specific gravity and breather pipe for proper operations.
-
-
X
X
X
X
Side stand switch* Check and clean or replace as necessary.
-
X
X
X
X
X

* It is recommended that these items be serviced by a Yamaha dealer or other qualified mechanic.
 

The V-Belt is 19.5 mm (0.77") wide when new. The service limit is 17.5 mm (0.69").
Sheave weight diameter when new is 18.0 mm (0.71"). The service limit is 17.5 mm (0.69").

Note: For further odometer readings, repeat the above maintenance at the period established: Service 1: every 3,000 km (1,900 mi), Service 2: every 6,000 km (3,800 mi), and service 3: every 9,000 km (5,700 mi) intervals.

Periodic Maintenance - Emission Control System
No. Item Remarks Initial
1,000 km
(600 mi)
or
1 month
Service 1
4,000 km
(2,500 mi)
or
7 months
Service 2
7,000 km 
(4,400 mi)
or
13 months
Service 3
10,000 km
(6,300 mi)
or
19 months
13,000 km
(8,200 mi)
or
25 months
1* Valve Clearance Check and adjust valve clearance when engine is cold. X X X X X
2* Spark Plug Check condition. Adjust gap and clean. Replace at 4,400 mi (7,000 km) (or 13 months) and thereafter every 6,000 km (or 12 months). ND U20FSR-U with 0.024 - 0.028" gap - X Replace X Replace
3* Crankcase ventilation system Check ventilation hose for cracks or damage. Replace if necessary. - X X X X
4* Fuel line Check fuel hose and vacuum pipe for cracks or damage. Replace as necessary. - X - X -
5* Exhaust system Check for leakage. Retighten if necessary. Replace gaskets if necessary. - X X X X
6* Idle speed Check and adjust engine idle speed. Adjust cable free play. - X X X X
7* Evaporative emission control system** Check control system for damage. Replace if necessary - - X - X

* It is recommended that these items be serviced by a Yamaha dealer or other qualifited mechanic
** California models only

Note:
For further odometer readings, repeat the above maintenance at the period established: Service 1: every 3,000 km (1,900 mi), Service 2: every 6,000 km (3,800 mi), and service 3: every 9,000 km (5,700 mi) intervals