Dr. Pulley
Description
Fine-tune your CVT transmission performance and extend component longevity with Dr. Pulley 23x18 Round Roller Weights. Precision-engineered for 250cc and 300cc liquid-cooled scooter, go-kart, and UTV engines, these round rollers utilize a proprietary low-friction composite material designed to withstand high temperatures, reduce wear, and deliver smooth, consistent variator shifting across your entire powerband.
Key Features
- Proprietary Composite Construction: Engineered with low-friction, high-durability polymer material that significantly outlasts standard OEM nylon weights.
- Exceptional Thermal Resistance: Formulated to maintain structural integrity under extreme heat and heavy continuous loads without warping or flat-spotting.
- Smooth Variator Shifting: Minimizes internal variator ramp drag, allowing your drive belt to move smoothly through the pulleys for linear acceleration.
- Complete 6-Piece Set: Packaged as a precisely matched set of six (6) 23mm x 18mm roller weights for balanced variator rotation.
Vehicle & Engine Compatibility
The 23x18mm weight profile is a standard footprint for 250cc to 300cc liquid-cooled engines, including Honda CN250/CF250 and 172mm engine architectures:
| Brand / Engine Family | Compatible Models & Engine Platforms |
|---|---|
| Honda | Helix (CN250), Elite 250 (CH250), Reflex (NSS250), Big Ruckus (PS250), Foresight 250, Forza 250 |
| KYMCO | People 250 / 250S / 300i, Xciting 250 / 300, Bet & Win 250, Grand Vista 250, Yager GT 200i / 300i |
| CFMoto & 172mm Engines | V3 (CF250T-3), V5 (CF250T-5), Fashion 250, Glory 250, and liquid-cooled 172mm / 172mm-A / 172mm-B 4-stroke engines |
| 250cc Buggies & Go-Karts | Hammerhead SS 250 / GTS 250, Joyner 250, TrailMaster 250, Roketa 250, BMS 250, SunL 250 |
| Import 250cc Scooters | Roketa, Ice Bear, Jonway, Lance, Tank, Vitacci, ZNEN, and Diamo 250cc water-cooled models |
Roller Weight Tuning Guide
Choosing the correct weight is essential for tailoring transmission response. Lighter weights (10g–16g) increase engine RPMs for quicker off-the-line launches and hill-climbing. Heavier weights (22g–26g) lower cruising RPMs for smoother highway riding and higher top speeds.
Technical Specifications
- Outer Diameter: 23mm
- Width: 18mm
- Package Quantity: Set of 6
- Engine: 250cc–300cc Liquid-Cooled 4-Stroke (172mm / CN250 / CF250)
- MPN: RR2318
- Country of Origin: Taiwan (TW)
Mechanic's Installation Tip: Ensure variator ramps and center boss are clean and dry before installation. Use brake cleaner and a lint-free towel to remove belt dust. Do not apply grease — Dr. Pulley composite rollers are designed to run completely dry.
Product Diagrams
Features
Specifications
MPN: RR2318 | Size: 23mm x 18mm | Qty: Set of 6 | Engine: 250cc-300cc Liquid-Cooled 4-Stroke | Architectures: 172mm, CN250, CF250 | Origin: Taiwan
Model Fitments
Honda CN250/CH250/NSS250/PS250, KYMCO People 250/300i/Xciting 250-300, CFMoto 172mm engines, 250cc buggies/go-karts, import 250cc water-cooled scooters
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
