Dragonman's 58th Year of Harley Davidson Rebuilding

Published on May 13, 2025
Duration: 10:08

This video details advanced Harley Davidson engine rebuilding processes performed by Dragonman, a specialist with 58 years of experience. It covers flywheel shaving for improved RPMs, connecting rod refurbishment with new bushings and honing, cylinder boring and honing using specialized machines, valve grinding with multi-angle cuts, and transmission component replacement including gears and bearings. The content emphasizes precision, specialized tooling, and the extensive knowledge gained through decades of hands-on work.

Quick Summary

Flywheel shaving on Harley Davidson engines removes excess weight to increase RPMs and improve throttle response. Connecting rods are rebuilt with new bushings and honed to a precise crank pin. Cylinders are bored to a 1.5-2 thousandths clearance, and transmissions are repaired by replacing worn gears, clutches, and bushings.

Frequently Asked Questions

What is flywheel shaving and why is it done on Harley Davidson engines?

Flywheel shaving is a process where excess weight is removed from the flywheel. This modification is popular for increasing engine RPMs and improving throttle response, allowing the motorcycle to accelerate faster and feel more responsive to rider input.

How are connecting rods rebuilt for Harley Davidson engines?

Connecting rods are rebuilt by installing new bushings, glass beading them for a clean finish, straightening any bends, and then honing them to a precise three-hole crank pin for optimal fit and function within the engine.

What are common wear points in a Harley Davidson four-speed transmission?

Common wear points in a four-speed transmission include the third gear, the shifter clutch, and the bushings within the main shaft and counter shaft. These components often wear out due to the forces of shifting and power delivery.

What is the recommended clearance for bored cylinders in Harley Davidson engines?

When boring cylinders, the recommended clearance is typically between 1.5 to 2 thousandths of an inch. This precise clearance ensures proper piston movement without excessive play or binding, contributing to engine longevity and performance.

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