• Kawasaki H1 500SS Mach III machined billet cylinder head — iNOUE BORING Japan
  • Kawasaki H1 500SS Mach III machined billet cylinder head — product overview video by iNOUE BORING Japan
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  • Kawasaki H1 500SS billet cylinder head — polished finish, vintage motorcycle performance part Japan
  • Kawasaki H1 Mach III machined cylinder head — race-proven combustion chamber shape, iNOUE BORING
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iNOUE BORING

Kawasaki H1 500SS Mach III Machined Billet Cylinder Head

Kawasaki H1 500SS Mach III Machined Billet Cylinder Head

$1,699.00
$1,699.00
Sale Sold out
Shipping calculated at checkout.

Item Specifics

Condition New Machine Type N/A
Items Included N/A Manufacturer Part # N/A
Compatible Model H1 Material Aluminum
Superseded Part # N/A Vintage Part No
Engine Type 2-Stroke Brand Kawasaki
Type Cylinder Head Interchange Part # N/A
Manufacturer Warranty 3 Months OE/OEM Part # no, N/A
Country/Region of Manufacture Japan Finish Polished
Performance Part Yes UPC N/A
  • Kawasaki 500SS H1 Cylinder Heads New Billet
  • Long-established internal combustion engine shop Mach (H1) machined cylinder heads Inoue Boring Kawagoe City Japan NEW!!
  • In the world situation where engine production will eventually cease, we want to leave engines for the future of the 22nd century.
  • Excellent durability and heat dissipation, and high-efficiency combustion chamber shape proven in races
  • Beautiful high performance that only machined cylinder heads can provide, and an appearance that enhances the quality of Mach H1.

Why the H1 Cylinder Head Needed a Solution

  • The Kawasaki H1 500SS Mach III is a legendary 2-stroke triple, but original cylinder heads suffer from heat dissipation limitations and age-related degradation.
  • Worn or cracked original heads compromise compression, combustion efficiency, and overall engine performance.
  • A precision machined billet replacement restores and exceeds original performance standards.

Machined Billet Cylinder Head Design

  • High-efficiency combustion chamber shape proven in race applications — optimized for the H1 500SS engine.
  • Precision CNC machining ensures perfect sealing surface flatness and consistent port geometry.
  • Polished aluminum finish enhances both heat dissipation and visual quality.

Why Choose iNOUE BORING?

  • Long-established internal combustion engine specialist based in Kawagoe City, Japan.
  • 3-month manufacturer warranty on all machined components.
  • Committed to preserving vintage motorcycle engines for future generations.
  • Custom sizes available — Please fill out the form below.


Compatibility

Year Make Model Submodel Notes
1969 Kawasaki H1 Mach Ⅲ


Frequently Asked Questions

▶ What is a machined billet cylinder head?

A machined billet cylinder head is precision CNC-machined from a solid block of aluminum, rather than cast. This results in superior dimensional accuracy, better heat dissipation, and a higher-efficiency combustion chamber shape compared to original cast heads.

▶ Which Kawasaki H1 models is this compatible with?

This cylinder head is compatible with the Kawasaki H1 500SS Mach III (1969). Please contact us if you need compatibility information for other years or variants.

▶ What are the advantages over the original cylinder head?

The machined billet cylinder head offers excellent durability, superior heat dissipation, and a high-efficiency combustion chamber shape proven in races — performance that only precision machining can provide.

▶ Can I order a custom specification?

Yes. If you require a different specification or size, we can manufacture to order. Please fill out the form below.

▶ What warranty is included?

All machined components from iNOUE BORING include a 3-month manufacturer warranty.


Learn More About iNOUE BORING Technology


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Please fill out the form below:

Enter your engine information and click “Submit.” We’ll confirm you within one business day.

ICBM™ gives your engine alive again!

  1. Long-lasting super durability
  2. Preserve your engine while riding
  3. Feel the engine's pulse forever!

“We want to create a cylinder that doesn't wear down...” This has been Inoue Boring’s long-held dream. This technology dramatically improves the durability of the cylinder bore by manufacturing an aluminum sleeve and applying a special plating to the inside diameter.

LEARN MORE

Why ICBM™ is "Revolutionary”

✔ Exceptional wear resistance
✔ Lightweight
✔ Low friction (reduces ring wear)
✔ Highly resistant to seizure
✔ Excellent heat dissipation
✔ Uniform expansion rate
✔ And it’s rust-resistant!

TESTIMONIALS

”Elegance Reborn: My Mach III Runs Like New”

My Kawasaki Mach III is over 50 years old. Many parts were worn out, so I used Inoue Boring’s modern engine work to bring it back. With  ICBM™ treatments, it runs smooth and strong. It won First Place at a restoration contest hosted by Inoue Boring. This bike is old—but alive.

-Mr.Hirakawa　Kawasaki H1 Owner　
Japan

”Back to Life: My Orange H1-B with ICBM™”

“After years in storage, I brought my H1-B back with Inoue Boring’s ICBM™ treatment. The old cast-iron sleeve was replaced with an aluminum one, letting me return to the standard bore. I even added a bridge port. It’s not about more power—it’s about bringing back the ride I remember.”

-Mr. Katsumi Taguchi　Kawasaki H1-B Owner
Japan

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