HD Engine/Transmission Repair & Machine Shop Services

At Bay Choppers, we specialise in the machining and repair of Harley-Davidson engines and transmissions from 1936 to 1999. Whether you're bringing a vintage motor back to life, restoring or modifying a classic Harley, or rebuilding a tired engine for reliable everyday riding, we have the experience, equipment, and attention to detail to deliver quality long lasting results.

Based in Dunedin, New Zealand, we work with customers throughout the country to keep their Vintage HD's running smooth and munching miles. 

Need a quote? Contact us today to discuss your project.


Mail-In Engine & Machining Services

Not located in Dunedin? No problem.

We regularly work with customers throughout New Zealand who ship their engines, cylinders, heads, flywheels, carburetors and transmission components to us for reconditioning and machining. Simply send us your parts, and we'll assess the work required before providing a detailed quotation.


Harley-Davidson Engines We Service

We specialise in:

  • Flathead
  • Knucklehead
  • Panhead
  • Ironhead
  • Shovelhead
  • Evolution (Evo)
  • Evolution Sportster

From stock rebuilds to performance-oriented builds, we understand the unique requirements of each Harley-Davidson engine platform.


Engine & Transmission Repair

Our workshop offers complete re-conditioning services, including:

  • Complete engine rebuilds
  • Top-end rebuilds
  • Bottom-end rebuilds
  • Flywheel assembly, truing and balancing
  • Connecting rod re-conditioning
  • Cam chest rebushing
  • Transmission rebuilding and repair
  • Engine inspection and fault diagnosis
  • Performance upgrades and modifications

Machine Shop Services

We provide a wide range of machining services for Harley-Davidson engines and components, including:

  • Cylinder boring & honing
  • Head and cylinder resurfacing
  • Piston fitting and clearance checking
  • Valve guide replacement
  • Valve seat cutting
  • Multi-angle valve machining
  • Lifter block & rocker arm honing & refinishing 
  • Flywheel assembly, balance, and truing
  • Bearing and bushing replacement and sizing
  • Rod race replacement and sizing
  • Aluminium welding & repair
  • Ultrasonic cleaning
  • Vapour and Abrasive blasting

    All machining is completed using precision equipment to ensure accurate tolerances and dependable performance.


    Contact Us

    If you're planning an engine rebuild, transmission overhaul, custom project, or require machining services, get in touch with Bay Choppers today.

    We'll be happy to discuss your project and provide honest advice and a no-obligation quotation.

    Andy@BayChoppers.co.nz
    027-346-766
    Dunedin, New Zealand