• YAMAHA RZ350 64 mm ICBM aluminum sleeve cylinder — Bridge-Port spec, iNOUE BORING Japan
  • YAMAHA RZ350 64mm cylinder rebuild service — nickel-silicon-carbide plated aluminum sleeve
  • YAMAHA RZ350 φ64mm ICBM cylinder — Bridge-Port pillar structure detail, iNOUE BORING
  • YAMAHA RZ350 cylinder bore — precision ICBM aluminum sleeve finish, Kawagoe Japan
  • YAMAHA RZ350 64mm ICBM sleeve — seizure-proof, lightweight, no break-in required
  • YAMAHA RZ350 φ64mm cylinder — nickel-silicon-carbide plating, 5x heat transfer of cast iron
  • YAMAHA RZ350 ICBM cylinder rebuild — Bridge-Port spec by iNOUE BORING, Saitama Japan
  • YAMAHA RZ350 64mm rebuilt cylinder — quality-guaranteed engine machining by iNOUE BORING
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INOUE BORING

YAMAHA RZ350 64.0 mm STD Port with bridge ICBM Aluminum Sleeve Finish Cylinder Processing

YAMAHA RZ350 64.0 mm STD Port with bridge ICBM Aluminum Sleeve Finish Cylinder Processing

$1,500.00
$1,500.00
Sale Sold out
Shipping calculated at checkout.

Item Specifics

Condition Service Machine Type N/A
Compatible Model YAMAHA RZ350 Bore Diameter φ64.0 mm STD
Port Spec Bridge-Port Sleeve Material Aluminum (Nickel-Silicon-Carbide Plated)
Engine Type 2-Stroke Brand YAMAHA
Service Type ICBM Cylinder Processing Turnaround Approx. 20 business days
Country/Region of Manufacture Japan Manufacturer iNOUE BORING
Performance Part Yes UPC N/A


About This Service

This is a cylinder rebuild service for YAMAHA RZ350 (φ64mm).
Upon receipt of your cylinder, we will rebuild it and return it to you.
Please send us only the cylinder and the corresponding piston, with payment in advance.

We will install an aluminum sleeve plated with nickel-silicon-carbide (hardness second only to diamond) and ensure proper piston clearance before returning it to you.

This rebuild also features Inoue Boring's original "Bridge-Port" specification, a unique pillar-type port structure designed to enhance durability and gas flow stability — ideal for high-performance and long-lasting results.


Never Wears Out. Seizure-Proof. Lightweight.

  • Ride right away — no break-in required
  • Exceptionally long-lasting
  • One-third the weight of cast iron
  • 5× the heat transfer of cast iron
  • Rust-free


What is ICBM Processing?

  1. Remove the original cast-iron sleeve.
  2. Install a precision nickel-silicon-carbide-plated aluminum sleeve.
  3. Ride with a lightweight, ultra-durable cylinder that preserves itself as you go.


How to Order

  1. Click [Add to Cart] to purchase the machining service only.
  2. Complete the quote/service form below.
  3. Within one business day we'll confirm schedule by email.
  4. Print the confirmation PDF and include it when you ship us your parts.
  5. After machining, we inspect every component and ship it back to you.


We Buy Your Spare Cylinders

Upgraded to ICBM cylinders? Sell your leftover originals to us — just submit a buy-back request through Quote & Service Form.

**Need pistons supplied? Request a quote on our Estimate Request page.
Processing takes about 20 business days.

All work is completed in our insured, domestic facility, and every component is quality-guaranteed. Ride with confidence — preserve your engine for the next generation.


Compatibility

Year Make Model Bore Notes
YAMAHA RZ350 φ64.0 mm STD Bridge-Port spec


Frequently Asked Questions

▶ What is ICBM cylinder processing?

ICBM (Inoue Boring Cylinder Bore Finishing Method) involves removing the original cast-iron sleeve, installing a precision nickel-silicon-carbide-plated aluminum sleeve, and finishing to exact piston clearance. The result is a lightweight, ultra-durable cylinder that is seizure-proof and requires no break-in.

▶ What is the Bridge-Port specification?

Bridge-Port is iNOUE BORING's original pillar-type port structure that enhances durability and gas flow stability. It is ideal for high-performance and long-lasting engine results on the YAMAHA RZ350.

▶ How do I order the cylinder rebuild service?

Add the service to cart, complete the quote/service form, and wait for email confirmation within one business day. Then ship your cylinder and piston to iNOUE BORING Co., Ltd., 671 Shimoakasaka Onohara, Kawagoe, Saitama 350-1155, Japan.

▶ How long does processing take?

Processing takes approximately 20 business days. After machining, every component is inspected and shipped back to you.

▶ Can iNOUE BORING supply pistons?

Yes. If you need pistons supplied, please request a quote on the Estimate Request page before ordering.


Learn More About iNOUE BORING Technology


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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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