Universal Parts 50cc Minarelli Variator Kit - 17 Spline
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Restore smooth acceleration, eliminate low-end hesitation, and maximize your CVT’s top-end belt transition with the Universal Parts 50cc Minarelli Stock Variator Assembly. An exact OEM-spec replacement for air-cooled and liquid-cooled 49cc/50cc 2-stroke Minarelli-clone engines, this complete kit repairs a grooved or worn front pulley face and includes pre-calibrated 5-gram roller weights to re-establish optimal CVT shift points for stock and mildly tuned commuter setups.
What’s Included
- Movable Pulley Face: Smooth, optimized ramp profile for clean, consistent belt travel without premature wear.
- Backplate with 3 Slide Guides: Rugged construction for reliable roller tracking.
- Inner Boss Slider Sleeve: Exact factory alignment for 17-spline crankshafts.
- 6 Roller Weights (5g each): Pre-calibrated for balanced off-the-line takeoff and steady cruising RPMs.
Specifications
- Crankshaft Spline Count: 17 teeth
- Back Plate Inner Diameter: 12.5mm
- Roller Weight: 5.0 grams each
- Engine Compatibility: 1PE40QMB / 41QMB 2-stroke Minarelli clones
- SKU: 1100-1233
Compatibility
Fits vehicles using the 1PE40QMB / 41QMB 2-stroke Minarelli-clone engine with a 17-spline crankshaft:
| Manufacturer | Compatible Models |
|---|---|
| Yamaha | Zuma 50 (2002–2011 “Bug Eye”) | Jog 50 (CY50/CG50) | Vino 50 2-Stroke |
| Genuine Scooter Co. | Buddy 50 | Roughhouse 50 | Rattler 50 |
| Adly | Fox 50 | Jet 50 | Noble 50 | Thunderbike 50 | Panther 50 |
| CPI / Keeway | CPI Oliver 50 | CPI Hussar 50 | Keeway Hurricane 50 | Keeway Matrix 50 |
| Avanti / Diamo / PGO | Avanti Beta 50 | Diamo Velocity 50 | PGO Big Max 50 |
| Malaguti | Phantom F12 50cc (horizontal Minarelli variants) |
Important — Spline Check Required: Minarelli-style engines were produced with two crankshaft variations: 15-spline and 17-spline. Count the physical teeth on your crankshaft before ordering. If you need the 15-spline version, see related items.
Installation Tips
- Use a holding tool: Never use an impact gun directly on the variator nut without a strap wrench or holding tool — excessive torque can strip the 17 crankshaft splines or crack the kickstart engagement gear.
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