CD70 and CG125 Clutch and Transmission Maintenance
The CD70 and CG125 use a simple, robust wet-clutch and 4-speed gearbox that can last for years with minimal care. This maintenance guide covers the adjustments and fluid choices that prevent the most common transmission complaints.
How the Wet Clutch Works
Multiple friction plates run bathed in engine oil. A cable or lever compresses them to engage. Because they are oil-cooled, they tolerate abuse far better than dry clutches, but they depend entirely on clean, correct oil for long life.
Clutch Cable Adjustment
Too much free play causes slipping; too little causes dragging and hard shifting. Adjust at the lever and the engine-side nut so there is a small, consistent free play. Inspect the cable for fraying and lubricate it periodically.
Engine Oil Choice
| Oil type | Effect on clutch |
|---|---|
| MA-rated motorcycle oil | Clutch-safe, recommended |
| Energy-saving car oil (low-friction) | Can cause slip |
| Correct viscosity for climate | Protects gears |
Shift Linkage Care
Keep the shift lever and linkage tight and lubricated. A worn or bent linkage causes missed shifts and false neutrals. Replace worn shift-return springs promptly to avoid being stuck in gear.
Frequently Asked Questions
When should I adjust the clutch?
When you notice slipping under acceleration, or dragging (hard to find neutral, gear grinding). Check free play at every oil change.
What is the best oil for a CG125?
A MA-rated 4-stroke motorcycle oil of the viscosity recommended for your climate. Avoid low-friction ‘energy saving’ car oils that can make the wet clutch slip.
What causes a slipping clutch?
Excess cable free play, worn friction plates, or wrong (too slippery) oil. Address free play first, then inspect plates if slipping persists.