What causes Carb jets clogged from old fuel sitting on the Honda Cb400 (likely Cb400n/cb400t)?

Cold start, idle quality, hesitation under throttle Estimated fix cost: $50-$150

What causes Cam chain tensioner wear causes rattling on the Honda Cb400 (likely Cb400n/cb400t)?

Cold startup rattle disappearing once warm Estimated fix cost: $80-$200

Battery voltage at idle, check for overcharging Estimated fix cost: $60-$180

Oil residue on fork lowers and front wheel Estimated fix cost: $100-$250

Known issues to inspect before buying a used Honda Cb400 (likely Cb400n/cb400t). What to check and how much repairs cost.

MODERATE

Cold start, idle quality, hesitation under throttle

Fix cost: $50-$150

MODERATE

Cold startup rattle disappearing once warm

Fix cost: $80-$200

SERIOUS

Battery voltage at idle, check for overcharging

Fix cost: $60-$180

SERIOUS

Oil residue on fork lowers and front wheel

Fix cost: $100-$250

☐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