The "Periodic Maintenance / Lubrication Intervals" schedule is taken directly from a 1983 edition Yamaha QT50F factory service manual. Before starting any work, always consult the manual for your scooter's model & year and be sure you know what you're doing.
Item |
Remarks |
Type |
Initial 1 month |
Initial 3 months |
Initial 6 months |
Thereafter every 6 months |
Thereafter every 1 year | |
| Cylinder head/exhaust system | Decarbonize | - | X | X | X | |||
| Spark Plug | Inspect/Clean or replace as required | NGK BP4HS .024" - .028" gap |
X | X | X | X | ||
| Air filter | Wash & dampen with oil | Yamalube 2-cycle or SAE motor oil | X | X | X | |||
| Carburetor | Check operation, Clean/refit/adjust | - | X | X | ||||
| Brake system (complete)* | Adjust free play. Replace shoes if needed | Front EBC501, DP9109 Rear EBC501, DP9109 |
X | X | 3 months | X | ||
| Autolube Pump | Check. Adjust and bleed air as needed. | - | X | X | X | X | ||
| Wheels & Tires* | Front 18 psi, Rear 28 psi | Front 2.00 X 14 Rear 2.25 X 14 |
X | X | X | X | ||
| Suspension system* | Check operation. Repair as required | - | X | X | X | X | ||
| Battery* | Top with distilled water. Check specific gravity and breather pipe. | - | X | X | X | X | ||
| Lights/Signals* | Check operation. Replace bulbs as required. | - | X | X | X | X | ||
| Fittings/Fasteners* | Tighten when needed | - | X | X | X | X | ||
| Transmission oil* | Replace (warm engine before draining) | 300cc SAE 10W30 type SE motor oil | X | check | X | X | ||
| Control and meter cables* | Apply lightly | Lithium base grease | X | X | ||||
| Brake lever | Apply lightly | Lithium based grease | X | X | X | |||
| Brake cam shaft | Apply lightly | Lithium based grease | X | X | X | |||
| Throttle grip and housing | Apply lightly | Lithium based grease | X | X | ||||
| Steering bearings | Inspect thoroughly and pack moderately | Lithium based grease |
|
2 years | ||||
| Speedometer gear housing | Apply grease lightly | Lithium soap base grease | 2 years | |||||
| Wheel bearings | Check bearings for smooth rotation | Medium weight wheel bearing grease | X | |||||
| Middle and final gear | Check bearings for smooth rotation | Lithium base wheel bearing grease | 2 years |
*Indicates pre-operation check items