(4) Rotax Vilted Spy Seal 28x38x7mm FPJ Teflon

€4.99
  Tax included
Reference: K110

The Crankshaft spy seal 28x38x7mm fpj (ref. 650480) is a high-tech component designed to seal the low engine at the crankshaft silks. His contact lip is manufactured in Teflon (PTFE), a material offering exceptional thermal resistance and an extremely low friction coefficient. This is the standard used on the engines Rotax Evo To maximize power while ensuring perfectly air seal and mixture.


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Full description: why teflon (FPJ)?

Unlike classic rubber seals, the model FPJ Teflon Offer decisive benefits for competition:

  1. Discount friction: Teflon slips better on the steel of the crankshaft. This makes it possible to free up some precious horses by limiting the mechanical strength during rotation.

  2. Thermal resistance: The low driving force of a Rotax heats a lot. Teflon retains its sealing properties where rubber could harden or melt.

  3. Pneumatic sealing: A defective spy seal creates an "air intake". The FPJ seal guarantees a constant pre-compression in the housing, ensuring a frankly climb and a stable idle.

  4. Increased longevity: Its structure is designed to withstand the chemical aggressions of modern mixing oils and octane high-index fuels.


💡 Michel's trick

"Listen well, because that's where we recognize the real mechanos: We never go up a teflon sealBut we do not go up no matter what! Unlike old joints, teflon lip is very fragile at editing. My advice: Check that the silk of the crankshaft is clean as a mirror. Use a protective sleeve or some tape on the grooves to not cut the lip in the thread. And be careful, the seal rises with the lip (the spring) towards the interior of the engine. If you go upside down, you'll suck the air and your engine will tighten in two minutes! "


🎓 TUTO: installation and precautions

  1. Cleaning: Massage perfectly with the housing. The outer edge of the seal must be clean for "biting" aluminum.

  2. Lubrication: Put a thin film of engine oil on the inner lip before sliding the seal on the crankshaft.

  3. Positioning: Use a laying tool (or a large diameter sleeve) to press the seal well flat. It must be perfectly perpendicular to the axis.

  4. Verification: Once in place, the crankshaft must rotate freely by hand. If there is suspicious resistance, the seal may be misplaced.


✅ Features

  • Dimensions: 28 mm (interior) x 38 mm (outside) x 7 mm (thickness)

  • Material: FPJ / Teflon (brown / black depending on arrival)

  • Compatibility: Rotax 125 Max, Junior, Senior, Master, DD2 (All Versions Evo and Pre-Evo)

Note Magickart: Sold individually. A motor Rotax need Two Spy Joints crankshaft. We advise you to change them systematically at each revision of the low engine.

K110
6 Items

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