Sharpen throttle response and unleash rapid engine revving. Precision-balanced and weight-optimized, the KOSO High Performance Ignition Rotor reduces rotational mass for Yamaha 125cc-155cc liquid-cooled engine platforms without compromising charging reliability.
Detailed Product Description Transform the throttle dynamics and acceleration curve of your Yamaha scooter with the KOSO High Performance Lightweight Ignition Rotor (KV073010). Designed specifically for Yamaha's modern liquid-cooled 4-valve engine family, this precision-engineered flywheel upgrade significantly reduces crankshaft rotational inertia, allowing your engine to rev up faster and transfer usable horsepower directly to the rear wheel.
Precision-machined from premium materials and balanced to strict tolerances, the KOSO ignition rotor delivers an instant improvement in mid-range throttle pickup and corner-exit acceleration. By shedding unnecessary mass compared to the heavy stock factory rotor, it minimizes parasitic drag on the crankshaft while maintaining consistent magnetic flux to ensure steady electrical generation and reliable ignition timing. It installs cleanly using factory mounting locations with zero engine case cutting or modifications required.
Key Features and Benefits
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Optimized Rotational Inertia: Lightened architecture substantially reduces crankshaft drag, providing noticeably quicker engine spool-up and crisper throttle snap.
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Enhanced Acceleration: Improves pulling power and responsiveness through the mid-to-high RPM range, making highway passing and corner exit seamless.
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Precision Dynamic Balance: Rigorously balanced to eliminate high-speed harmonic vibration, protecting your crankshaft bearings and engine internals.
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Stable Power Generation: Engineered with high-coercivity magnets to deliver strong, consistent charging current to the ECU and electrical system.
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Broad Yamaha Fitment: Directly compatible across Yamaha's popular liquid-cooled platform, from the 7th Gen Cygnus XR to the 6th Gen Gryphus, Zuma 125, NMAX, and AEROX.
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Direct Bolt-On Fitment: Designed around OEM crankshaft taper and keyway tolerances for a clean, hassle-free installation.
Specifications
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Brand: KOSO Origin: Made in Taiwan
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Product Code: KV073010
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Category: Performance / Electronics / Ignition Rotor (高速輕量化電盤)
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Fitment Compatibility:
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Yamaha Cygnus XR 125 / 155 (7th Generation)
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Yamaha Cygnus Gryphus 125 (6th Generation)
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Yamaha Zuma 125 (2022+ Liquid-Cooled / US Models)
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Yamaha FORCE 2.0 155 / X FORCE 155
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Yamaha AUGUR 155
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Yamaha NMAX 155 (2020+)
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Yamaha AEROX 155 (2021+)
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Package Includes: 1x KOSO High Performance Ignition Rotor