Crank Center Labyrinth Seal for Kawasaki H1 500SS – LABYRI ☆Inoue Boring☆

This is a crank center labyrinth seal specifically designed for the Kawasaki H1 500SS.
Manufactured and precision-machined by Inoue Boring (井上ボーリング), this seal offers outstanding durability and airtightness, ideal for high-performance 2-stroke engines.

• 🔧 Compatible Model: Kawasaki H1 500SS

• 🔩 Type: Center Labyrinth Seal (LABYRI)

• 🏭 Manufacturer: Inoue Boring (Japan)

• ⚙️ High-precision machining for optimal sealing performance

• 🇯🇵 Made in Japan – trusted by vintage motorcycle restorers and tuners

Ensure proper crankcase pressure management and long engine life with this high-quality replacement part.

The biggest weakness of 2-stroke engines — center seal failure — is finally solved with the LABYRI labyrinth seal.

With LABYRI, you no longer need to fear seal blowout.
This advanced design eliminates pressure loss and energy leakage, delivering:

• ⚡ Sharper throttle response

• 🌀 Smooth, resistance-free rotation

• 🚫 Zero energy loss

Experience a dramatic improvement in pickup and engine behavior, all thanks to a precision-engineered solution trusted by professionals.

This is our fully original, proprietary product —
a non-contact, metal labyrinth-style crank center seal:
LABYRI™ by INOUE BORING.

Unlike conventional contact-type seals, LABYRI is non-wearing.
Thanks to its precision-engineered labyrinth structure, it eliminates friction and ensures:

• 🛠 Zero wear over time — truly built to last

• ⚡ Zero energy loss — no friction, no drag

• 🌀 Smooth, resistance-free crank operation

Because it’s a non-contact metal seal, LABYRI not only improves engine responsiveness, but also delivers eternal sealing performance — a revolutionary solution for 2-stroke engines.

Proudly developed and manufactured in Japan by INOUE BORING.

🔧 Key Features & Advantages

• ✅ No modification required — fits directly onto the stock crankshaft without machining

• 🎯 Crisp, defined appearance — adds a sharp, functional aesthetic to your engine

• 🛡️ Anodized finish for corrosion resistance — built to withstand harsh conditions

• 🔄 OEM-like design — faithfully follows original shape for seamless integration

• 🎯 Precision inner bore — anodizing is intentionally omitted on the inner diameter to preserve dimensional accuracy

• ⚙️ Zero friction — non-contact design means no rotational drag

• 🪙 Fully metal construction — unlike rubber seals, this will never degrade with age
  

✨ Manufactured by INOUE BORING — Trusted by performance engine builders across Japan.