Fluids and checks
- Gearbox oil is about 850 cc of 75W-90.
- Idle is 1,150–1,350 rpm. Chain slack is 25–35 mm.
- There is no mileage schedule in this extract.
RS125 · 1993–2006
Fluids and checks
Capacities and free play from the manual's specification pages. Mileage intervals for the top end are still the MCN figures, because this extract has no mileage schedule.
| Transmission oil | SAE 75W-90, API GL-4 or higher. About 850 cc. Drain plug 24 Nm. |
|---|---|
| Coolant | Half distilled water, half ethylene glycol antifreeze for aluminium engines. About 0.9 litres. |
| Brake fluid | DOT 5.1, listed as compatible with DOT 4. |
| Fork oil | SAE 10W to 20W. 430 cc each leg. Level Not published for the RS125. |
| Two-stroke oil | The manual extract does not name a grade code or a premix ratio. The MCN note on this site still says a premium two-stroke oil in the tank. |
| Grease | Lithium multi-purpose on the steering head, swingarm pivot, linkage bearings, bearing seals, and the lever, pedal and sidestand pivots. |
| Cables and twistgrip | Cable lubricant on cables. Twistgrip: multi-purpose grease, or a dry-film lubricant. |
| Chain | Gear oil, or a spray chain lubricant. Size 520. Slack 25–35 mm. |
Free play and idle
- Idle: 1,150–1,350 rpm.
- Throttle cable, at the twistgrip: 2–3 mm. Choke cable: 2–3 mm.
- Clutch lever: 10–15 mm.
- Clutch release arm: half a turn out. The steps for that adjustment are in the manual and are not reprinted here.
- RAVE cable: 0.5 mm.
- Rear brake pedal pushrod: 0.5–1.0 mm.
- Brake pad friction material: 1.5 mm minimum.
What is still not a service interval
Rings around every 5,500 miles, and piston and barrel around every 10,000, remain the MCN planning figures. Haynes 4298's photographed specification pages do not add a mileage table. Warm to 60°C before hard use is the same MCN note. The thermostat opens at 70–75°C, which is a different fact.
Notes from readers
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Sources
Research brief dated 24 October 2026. Where this page says “the brief”, that is the sourced master plan behind the first edition.