What causes Airhead carb sync and jetting issues on the Bmw R Series (r80 Or R100) Cafe Racer Custom?

Idle quality, throttle response, black smoke at exhaust Estimated fix cost: $50-$200

What causes Rear drive splines worn or dry on the Bmw R Series (r80 Or R100) Cafe Racer Custom?

Clunking on acceleration, inspect spline grease condition Estimated fix cost: $200-$600

Blue smoke on startup, check spark plugs for oil fouling Estimated fix cost: $300-$800

Inspect wiring harness for splices, tape, DIY connectors Estimated fix cost: $100-$500

Known issues to inspect before buying a used Bmw R Series (r80 Or R100) Cafe Racer Custom. What to check and how much repairs cost.

MODERATE

Idle quality, throttle response, black smoke at exhaust

Fix cost: $50-$200

SERIOUS

Clunking on acceleration, inspect spline grease condition

Fix cost: $200-$600

MODERATE

Blue smoke on startup, check spark plugs for oil fouling

Fix cost: $300-$800

SERIOUS

Inspect wiring harness for splices, tape, DIY connectors

Fix cost: $100-$500

☐Cold start test, no choke cheating

☐Check final drive for play or clunk

☐Inspect frame for welds or cracks

☐Verify engine cases not cracked or leaking

Solid if maintained, cafe mods add risk