What causes Carb jets clog from ethanol fuel sitting on the Honda Cb750 Nighthawk?

Cold start hesitation, rough idle, black smoke Estimated fix cost: $50-$150

What causes Cam chain tensioner wear causes engine rattle on the Honda Cb750 Nighthawk?

Ticking noise on cold startup near top end Estimated fix cost: $80-$200

Battery dies repeatedly, voltage under 13V running Estimated fix cost: $40-$100

Oil streaks on fork tubes, soft front end Estimated fix cost: $60-$120

Known issues to inspect before buying a used Honda Cb750 Nighthawk. What to check and how much repairs cost.

MODERATE

Cold start hesitation, rough idle, black smoke

Fix cost: $50-$150

MODERATE

Ticking noise on cold startup near top end

Fix cost: $80-$200

SERIOUS

Battery dies repeatedly, voltage under 13V running

Fix cost: $40-$100

MINOR

Oil streaks on fork tubes, soft front end

Fix cost: $60-$120

☐Check charging voltage with multimeter running

☐Listen for cam chain rattle cold start

☐Inspect fork tubes for oil residue

☐Test all four carbs for smooth throttle response

Bulletproof if maintained, neglect kills quickly