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SUN Racing CVT Center Spring (1000 RPM) for Yamaha Mio MXi 125
Product Overview
Upgrade your scooter’s continuous variable transmission (CVT) performance with the SUN Racing 1000 RPM Center Spring. Engineered specifically for the Yamaha Mio MXi 125, this premium upgrade delivers a highly responsive throttle and smoother power delivery.
By increasing tension over the stock spring, the 1000 RPM rating ensures your pulley shifts at the optimal powerband, eliminating lag during sudden acceleration and improving overall belt grip to prevent slippage.
Key Features
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Optimized Tension (1000 RPM): Perfectly balanced stiffness that provides immediate throttle response and a quicker snap back into lower gears when decelerating or climbing inclines.
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Premium Spring Steel Construction: Built using high-fatigue, heat-resistant alloy steel to maintain consistent tension and resist sagging even under high-load, daily commuting conditions.
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Anti-Belt Slip Technology: Enhances the grip of the secondary pulley on the CVT belt, maximizing power transfer from the engine directly to the rear wheel.
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Perfect Fitment: Tailored specifically to meet the dimensions and operational tolerances of the Yamaha Mio MXi 125 CVT system.
Specifications
| Attribute | Details |
| Brand | SUN Racing Performance Parts |
| Product Type | CVT Center Spring (Secondary Clutch Spring) |
| RPM Rating | 1000 RPM |
| Compatibility | Yamaha Mio MXi 125 (Fi / Carb) |
| Material | High-Tensile Carbon Steel Alloy |
Performance Benefits
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Better Low-to-Mid End Power: Noticeable jump in initial acceleration, making it perfect for stop-and-go city riding.
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Improved Incline Performance: Keeps the transmission in the correct gear longer when tackling steep hills or carrying pillion riders.
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Seamless Downshifting: Quick back-shifting when you roll off the throttle, giving you instant power the moment you twist it again.
💡 Pro-Tip for Tuning
The 1000 RPM center spring is an excellent choice for riders looking for a sportier performance profile over stock without drastically increasing engine stress or sacrificing fuel efficiency. For best results, pair this with matching SUN Racing flyballs/roller weights and a performance pulley set.
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