Honda Cb400 (likely Cb400n/cb400t) Common Problems
Known issues to inspect before buying a used Honda Cb400 (likely Cb400n/cb400t). What to check and how much repairs cost.
Carb jets clogged from old fuel sitting
MODERATECold start, idle quality, hesitation under throttle
Fix cost: $50-$150
Cam chain tensioner wear causes rattling
MODERATECold startup rattle disappearing once warm
Fix cost: $80-$200
Rectifier/regulator failure kills battery
SERIOUSBattery voltage at idle, check for overcharging
Fix cost: $60-$180
Fork seals leaking oil onto front brake
SERIOUSOil residue on fork lowers and front wheel
Fix cost: $100-$250
Pre-Purchase Checklist
☐Cold start the bike before warming up
☐Check for cam chain rattle at startup
☐Inspect forks and brake disc for oil
☐Test battery voltage under load at idle
Solid, simple bike if maintained regularly