Longevity for your engine, heritage in every mile.
In No Way Boring.
Inoue Boring is not boring at all.
We engineer the future of engines — from classic machines to hydrogen-powered motorcycles.
Preserving 20th-century engine heritage
with 21st-century engineering.
Eternal Engine Pulse with Aluminium Sleeves
- Long-lasting, super durable
- Preserve your engine as you ride
- Feel the engine's pulse forever
“We want to create a cylinder that never wears out.”
That has been our long-held dream.
Our technology dramatically enhances cylinder-bore durability by producing aluminum sleeves and applying a proprietary plating to their inner diameter.
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
Blog
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All Process of ICBM™︎, Episode 6
All Process of ICBM™︎, Episode 6 – from material to finish In previous episodes, we explained that ICBM™︎ is not a single machining trick. In this episode, we...
All Process of ICBM™︎, Episode 6
All Process of ICBM™︎, Episode 6 – from material to finish In previous episodes, we explained that ICBM™︎ is not a single machining trick. In this episode, we...
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ICBM™ is not a single “trick,” — EPISODE 5
Chapter 1 — Why We’re Talking About the Whole Process Up to now, we have often spoken about ICBM™ through its results: durability, fewer failures, and the ability to keep...
ICBM™ is not a single “trick,” — EPISODE 5
Chapter 1 — Why We’re Talking About the Whole Process Up to now, we have often spoken about ICBM™ through its results: durability, fewer failures, and the ability to keep...
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What Is Plateau Honing? Episode 4
Plateau Honing: Why It Is Our Standard Finish Episode 4 Plateau honing is a cylinder finishing process performed after boring.At Inoue Boring, this is not an optional upgrade — it...
What Is Plateau Honing? Episode 4
Plateau Honing: Why It Is Our Standard Finish Episode 4 Plateau honing is a cylinder finishing process performed after boring.At Inoue Boring, this is not an optional upgrade — it...
ICBM™ Insight
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ICBM™: Revive Vintage Engines. No Rust or Warm-...
Our ICBM™ aluminum sleeves solve common vintage engine issues. Uniform thermal expansion and rust-proof properties ensure stable clearances and long-term reliability.
ICBM™: Revive Vintage Engines. No Rust or Warm-...
Our ICBM™ aluminum sleeves solve common vintage engine issues. Uniform thermal expansion and rust-proof properties ensure stable clearances and long-term reliability.
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ICBM™: Ultimate Heat & Seizure Defense for Your...
ICBM™ technology enhances vintage bikes with superior heat dissipation and seizure resistance, ensuring reliable performance and peace of mind in even the toughest conditions.
ICBM™: Ultimate Heat & Seizure Defense for Your...
ICBM™ technology enhances vintage bikes with superior heat dissipation and seizure resistance, ensuring reliable performance and peace of mind in even the toughest conditions.
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The ICBM™ Feel: Lighter, Sharper, Smoother
Discover how ICBM™'s low friction and weight reduction benefits vintage motorcycles. Lighter, smoother engines mean better response, handling, and durability.
The ICBM™ Feel: Lighter, Sharper, Smoother
Discover how ICBM™'s low friction and weight reduction benefits vintage motorcycles. Lighter, smoother engines mean better response, handling, and durability.