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.
Shipping information
Orders are prepared as quickly as possible. Delivery times and shipping costs are calculated at checkout based on the destination and items ordered.
Returns & warranty
Please verify fitment and part number before ordering. Contact Thrifty Scooters promptly if an item arrives damaged or incorrect.