Summary: the water circuit tightness

The external cylinder head seal is a high diameter o-ring that ensures the peripheral sealing between the cylinder and cylinder head cover on the latest generation TM Racing motors (KZ10C, R1, R2). Unlike the internal seal (which seals the combustion chamber), the mission is to contain the coolant and to avoid any leakage to the outside of the engine.

Made in a high temperature elastomer, it retains its elasticity despite repeated heating cycles and intense vibrations characteristic of the Queen Kz category.

- Why choose the original TM Racing seal?

Exact tolerances: a diameter and a section perfectly calibrated to fit into the groove of cylinder without pinching.

Thermal resistance: material specifically chosen to withstand the temperature variations of the coolant without cracking.

Reliability in the race: avoids pressure losses in the cooling system, ensuring that your engine remains at its optimum operating temperature.

Longevity: Mechanical properties above adaptable joints, allowing (sometimes) several disassemblies if the state allows it.

💡 Michel's trick

"The external seal, it is the one that warns you if there is a concern! My Pro Council: never goes up completely to dryness. The trick: put a thin film of silicone grease or a little coolant on the seal before placing the Cylinder head. It helps him to get in place in his throat without squirming. CAUTION: If you see traces of limestone or blue liquid on the fins of your cylinder, does not look, this seal is cooked. An external seal that is fleeing, it is a fire heater insured because of pressure loss!"

- Mounting & Maintenance Guide

Cleaning: Before laying, make sure the cylinder groove is perfectly clean. A grain of sand is enough to create a micro-leak.

Tightening: Imperatively observe the cross tightening torque recommended by TM Racing for the cylinder head, in order to crush the joint uniformly.

Replacement: to change systematically during each high engine revision or if you notice a seepage.

- Technical specifications

Brand: TM Racing (Italy).

Type: Circular Section O-ring.

Position: External (periphery of the cylinder head).

Compatibility: * TM KZ10 / KZ10B / KZ10C

TM R1 / R1-L1

TM R2

Material: Viton / high temperature elastomer.

❓ FAQ SEO (Frequently Asked Questions)

Q: Can I reuse this joint if I dismount my cylinder head just to inspect the piston?

A: If the seal is recent and is not "flattened", it is possible, but for the price of the room, we strongly recommend putting a new seal to avoid spoiling a rolling session.

Q: Is this joint the same as that of the combustion chamber?

A: No, this one is the big outdoor seal. The combustion chamber seal (internal) is smaller and often in black or green vit.

✅ Why buy at Magickart?

Standing stock: We know it's an indispensable maintenance piece.

100% Origin: No copies, only TM factory part.

Technical advice: We know TM engines by heart, do not hesitate to solicit us.