Pump pinion pion d4 l 15.8 Rotax Max (8)

€0.99
  Tax included
Reference: RX232731

The Pion of water pump pinion (D4 x 15.8 mm) is the mechanical link axis that crosses the water pump shaft to secure the drive sprocket. With its diameter of 4 mm and its precise length of 15.8 mmHe acts as a transmission pin. It is he who physically transmits the rotary motion of the bottom motor to the propeller of the water pump.


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Full description: what is the purpose of this piece?

Despite its small size, this pawn (ref. 229471) is a critical link of the kinematic chain:

  1. Power transmission: It locks the plastic pinion onto the metal axis. Without him, the pinion would turn in the void and the water pump would no liquid.

  2. Dimensional precision: Its length of 15.8 mm is calculated to fit perfectly into the gableback housing without exceeding, thus avoiding any friction against the engine crankcase.

  3. High resistance material: Made of rectified and treated steel, it supports the significant shear forces during brutal motor mounted.

  4. Thermal safety: By guaranteeing the constant drive of the pump, it is the guarantor of the temperature stability of your cylinder.


💡 Michel's trick

"It's the room that everyone loses when you dismount the clutch housing! This small 4mm pawn has a false tendency to slide from the axis and finish at the bottom of the motor housing if you do not pay attention. My advice: to reassembly, Turn a small tip of thick fat on the pawn for it to be glued in its housing on the axis time to slide the pinion over it. And check that it is not marked or twisted: if the pawn pawn is the immediate overheating and the engine that goes up in smoke!"


🎓 TUTO: assembly and precautions

  1. Cleaning the axis: Make sure the transverse hole on the water pump shaft is clean and no burr.

  2. Insertion: Slide the pawn (4x15.8) into the axle. It must be perfectly centered.

  3. Alignment of the pinion: Present the water pump pinion by aligning the internal notch with the pawn. The pinion must snap off without forcing.

  4. Securing: Once the pinion is in place, do not forget the wedge and the circlip who come to lock the set to prevent the pawn from getting out of his housing.


✅ Compatibility

  • Rotax 125 Max (Junior, Senior, Master, Evo)

  • Rotax 125 DD2

  • 125 micro & mini max engines

Note Magickart: Original room Rotax. A safety element to have imperatively in its "backup box" on the circuits.

RX232731
8 Items

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