The bearing 6005 TN9 C3 of balancing shaft X30 (mark 131 on IAME technical view) is a precision bearing mounted on theBalancing shaft Engine IAME X30. It is a model SKF, designed with a polyamide cage (TN9) and one Internal game C3, adapted to high speeds and thermal conditions of karting.

Role of rotation

LBalancing shaft the X30 engine is used to compensate vibrations caused by the alternating movement of the piston and crankshaft. It rotates in the opposite direction to balance the rotating masses.

The 6005 TN9 C3 bearing allows this shaft to spin freely and accurately in the crankcase, while supporting the dynamic forces generated by the rapid rotation of the engine (up to more than 16,000 rpm). A smooth and well-guided rotation of the balancing shaft guarantees the mechanical stability and reduces overall engine fatigue.

Technical specifications

• Type: one row ball bearing.
• Full reference6005 TN9 C3.
• Dimensions25 mm (inside) × 47 mm (outside) × 12 mm (thickness).
• Cage TN9: in reinforced polyamide (technical plastic material), lighter and quieter than a steel cage.
• Game C3: Internal game increased to support the thermal expansion at high temperature, without risk of tightening.
• Manufacturer: SKF, renowned for its high speed precision bearings.

This configuration allows more flexible operation1 noise and friction reduction, and one increased lifetime in a very high engine environment.

Benefits of polyamide cage (TN9)

• Less friction and noise than a metal cage.
• Better resistance to shocks and vibrations.
• Lighter, which reduces the inertia of the bearing.
• Good temperature and lubricant handling of modern two-stroke engines.

This type of cage is perfectly suited to a balancing shaft, where the rotation speed is high but radial loads remain moderate.

The bearing 6005 TN9 C3 is therefore a key element in the smoothness and longevity of the X30 engine. With its lightweight design and adapted play, it contributes directly to the vibration reduction and mechanical reliability the whole engine.