UMA Racing Timing Chain Gear for Yamaha Aerox 155 - 02TG0070

The UMA Racing Timing Chain Gear (02TG0070) is a high-performance engine component specifically engineered for the Yamaha Aerox 155 (V1 & V2).

 

Unlike a standard fixed gear, this unit combines adjustable timing with integrated decompression technology, making it a critical upgrade for riders using high-compression (high-CR) cylinder kits or performance camshafts.

 

Key Technical Specifications

Feature	Specification	Impact
Model Code	02TG0070	Specific to the Yamaha Aerox/NVX V2 platform.
Technology	Decompression Mechanism	Reduces cylinder pressure during startup.
Material	High-Grade Carbon Steel	Extreme durability and resistance to high-load wear.
Adjustability	+/- 5 Degrees	Allows for fine-tuning of the powerband.
Compatibility	Yamaha Aerox 155 / NVX	Fits both V1 and V2 models; also compatible with NMAX V2.

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Core Performance Benefits

• Effortless Engine Startups: The built-in pressure-reducing mechanism is designed to solve the "heavy cranking" common in modified Aerox engines. By bleeding off excess compression during the initial rotation, it ensures a smooth and easy start, whether using the electric starter or a kickstart.

   

• Reduced Starter Strain: By making the engine easier to turn over, this gear significantly prolongs the life of your starter motor and battery, preventing the burnout that often occurs with high-compression bore-up kits.

   

• Customizable Powerband: The adjustable timing gear allows you to shift your motorcycle's power delivery without needing a programmable ECU.

   

  • Advancing the timing generally improves bottom-end torque for better city acceleration.

  • Retarding the timing moves the power to the top-end for higher peak speeds on the highway.

• Enhanced Precision: Precision-machined from carbon steel, it provides a secured fitting and increased rigidity, ensuring your valve timing remains perfectly synchronized even at high RPMs.

   

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Why Use the 02TG0070?

The Aerox 155 is a popular platform for 62mm and 63mm bore-up kits. These modifications increase compression to a point where the stock starter system struggles. The UMA Racing Decompression Gear is the industry-standard solution for maintaining daily-driver reliability on a racing-spec scooter.

Installation Note

While this is a direct-fit component, installation involves accessing the timing chain and camshaft assembly. It is highly recommended that a professional technician performs the installation to ensure the TDC (Top Dead Center) marks are perfectly aligned and the adjustable bolts are torqued to spec.