Testing Motors on a Snow Day

Published on January 25, 2026
Duration: 5:27

This video details advanced motorcycle engine rebuild and modification techniques, focusing on Shovelhead engines. Dragonman, an experienced mechanic and business owner, explains flywheel lightening for higher RPMs, dual spark plug head modifications, and camshaft lift considerations. The content highlights the shop's capability to perform comprehensive engine services, including pricing for basic rebuilds to fully tuned assemblies.

Quick Summary

Dragonman's shop offers motorcycle engine rebuilds with tiered pricing: $1,200 for a basic rebuild, $1,700 for a complete assembly, and $1,800 for a fully run and tuned motor. Key modifications include flywheel lightening for faster revving and dual spark plug head work using Champion JHH8 plugs, with considerations for camshaft lift and valve springs.

Chapters

  1. 00:00Introduction & Shovelhead Motor
  2. 00:48Flywheel Machining & National Jobs
  3. 01:54Pricing for Engine Rebuilds
  4. 02:53Head Work & Dual Spark Plugs
  5. 03:42Shaved Flywheels & Cam Specs
  6. 04:55Contact Information & Location

Frequently Asked Questions

What are the different pricing tiers for Dragonman's engine rebuild services?

Dragonman offers a basic rebuild with gaskets for $1,200, a complete motor assembly for $1,700, and a fully run and tuned motor on a stand for $1,800, catering to various customer needs and budgets.

How does flywheel machining affect motorcycle engine performance?

Machining flywheels to reduce their weight, typically by about 2.5 lbs, allows the engine to rev faster and achieve higher RPMs more readily, enhancing acceleration.

What spark plugs are recommended for dual spark plug head modifications?

For dual spark plug cylinder head modifications, Champion JHH8 spark plugs are specifically recommended to ensure proper fitment and avoid interference with the piston during operation.

What is the significance of camshaft lift in engine performance?

Cam lift dictates how far the engine's valves open. Exceeding a .450 lift threshold generally requires upgraded valve springs to maintain proper valve control and prevent damage at higher RPMs.

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