What causes Oil leaks from rocker boxes and gaskets on the Harley-davidson Knucklehead?

Look for oil weeping around rocker covers and base gaskets Estimated fix cost: $200-$600

What causes Worn or cracked valve guides and seats on the Harley-davidson Knucklehead?

Listen for ticking, check for blue smoke at startup Estimated fix cost: $500-$1500

Wiggle engine in frame, inspect mounts for cracks visually Estimated fix cost: $300-$800

Check for brittle insulation, shorts, and amateur rewiring jobs Estimated fix cost: $150-$500

Known issues to inspect before buying a used Harley-davidson Knucklehead. What to check and how much repairs cost.

MODERATE

Look for oil weeping around rocker covers and base gaskets

Fix cost: $200-$600

SERIOUS

Listen for ticking, check for blue smoke at startup

Fix cost: $500-$1500

SERIOUS

Wiggle engine in frame, inspect mounts for cracks visually

Fix cost: $300-$800

MODERATE

Check for brittle insulation, shorts, and amateur rewiring jobs

Fix cost: $150-$500

☐Verify engine and frame numbers match title

☐Request full restoration or service history

☐Cold start test reveals true engine health

☐Inspect for non-original reproduction parts

High maintenance, rewarding if properly restored and serviced