My wife and I have a new SYM 125. Between my intuition regarding the pictures of the mechanical things and her translation of the words in the manual, we came up with a basic set of service intervals for this machine, which would probably apply to other 125cc four strokes as well.
Every 1000km:
- Engine oil change. Oil changes are quick and they’re cheap as chips. At the the place in Siaogang (Kaohsiung) where our family buys it’s bikes, the cost is $120.
- inspect tires for damage
Every 3000km:
- Inspect/replace air filter. This machine uses a hand-washable type of filter.
- Check spark plug gap.
- Check/adjust throttle cable tension.
- Check telescoping front forks for leakage, check rear shock for leakage
Every 5,000km:
- Change transmission oil. Again, easy and cheap
Every 6,000km:
- Change fuel filter.
2)Check drive belt tension. - Replace spark plug.
Every 12,000km
- Replace drive belt.
This model has drum brakes, and there is no mileage interval for brake adjustments, just a specification for maximum brake lever travel: 20mm. So if you can squeeze the levers farther than that, tighten up the brake adjusters.
-p