Honda CX500: Cafe Racer Donor Guide
The 'Plastic Maggot' became a custom-scene favourite for good reason: cheap, tough, and distinctive, with liquid cooling and shaft drive keeping routine maintenance low. Trade-offs are real — shaft drive limits rear customisation, and the stock lines need genuine frame/tank/seat work.
Engine: 497cc liquid-cooled 80° V-twin, OHV pushrod, ~48–50 hp @ 9,000 rpm
Years: 1978–1982 (base; Custom, Deluxe, Turbo and Eurosport variants alongside)
Weight: Mid-weight; shaft final drive
Final drive: Shaft
Value: Cheap end of the classic donors: rough examples from a few hundred dollars, a good running rider roughly $1,800–$3,500, clean examples up to ~$5,000–$7,900. (Ignore CX650 Turbo prices — different, far rarer bike.) Directional only — not an appraisal.
Common problems
- Early 1978 engines were subject to a factory recall (NHTSA 78V259000) for a cam-chain-guide bolt that could loosen — remedied units carry three punch-dots on the case.
- The camshaft-mounted water-pump mechanical seal can fail and push coolant into the crankcase (milky oil), especially if the design's weep hole has been blocked.
- Stator failure is one of the platform's recognised recurring faults.
What to check before you buy
- On early '78 bikes, check the engine serial against the recall range and look for the three punch-dots.
- Pull the dipstick for milky/frothy oil (water-pump seal); check for coolant trails near the timing area.
- Confirm the water-pump weep hole is clear, not plugged or painted over.
- Test charging output at idle and riding rpm (stator).
- Inspect frame/rust — shaft drive limits rear-wheel and swingarm changes, so plan the build around it.
Sources
Facts on this page are drawn from:
Values are directional guidance from classified and auction aggregates, not a verified appraisal — always check current sold comps for your market before buying or selling.