What causes Carb sync and jet clogging (pre-2000) on the Honda Cb400sf?

Idle smoothness, throttle response, no flat spots Estimated fix cost: $80-$200

What causes Cam chain tensioner rattle at startup on the Honda Cb400sf?

Listen for rattling first 10 seconds cold start Estimated fix cost: $50-$150

Check voltage at idle: should read 13.5-14.5V Estimated fix cost: $100-$250

Oil residue on lower fork legs, soft front end Estimated fix cost: $80-$180

Known issues to inspect before buying a used Honda Cb400sf. What to check and how much repairs cost.

MODERATE

Idle smoothness, throttle response, no flat spots

Fix cost: $80-$200

MODERATE

Listen for rattling first 10 seconds cold start

Fix cost: $50-$150

SERIOUS

Check voltage at idle: should read 13.5-14.5V

Fix cost: $100-$250

MINOR

Oil residue on lower fork legs, soft front end

Fix cost: $80-$180

☐Cold start test, listen for odd noises

☐Check service history and valve clearance records

☐Inspect frame for crash damage or welds

☐Test all gears, no false neutrals or clunks

Excellent reliability, one of best used buys