The C90’s build is simple – a handful of tools will cover most maintenance tasks, though the robust nature means little repair is needed. The pressed steel chassis is prone to rust on old, neglected or high miles bikes around the rear wheel arch – check it hasn’t got near the rear suspension mounts. The swingarm is susceptible to rust too, the header pipe rots and the wheels can give out – all of which are easily inspected, preventable or curable, so you can afford to be choosy when buying. The engine should need little more than faithful oil changes (it can easily burn through the tiny capacity) and valve clearance checks.
