Brand: Top Performances (TPR) · SKU: 86TPR · MPN: 9924240 (AM6 version reference) or 9926560 (Horizontal version reference) · Category: Components
The Maxi TPR kit by Top Performances is a high-end racing engine pack for Minarelli AM6 or Horizontal engines (like MBK Nitro/Yamaha Aerox). It features a top-of-the-range aluminum cylinder with a 50mm bore and a reinforced 44mm stroke, full-mass crankshaft, over-balanced via 4 masses, developing 86cc of power. It is not homologated for open road use and is formally reserved for competition. The kit includes a forged piston, reinforced bearings, an offset/woodruff ignition key, and a high-compression studded cylinder head for better heat extraction. It is noted for producing significant torque and high revs when paired with appropriate components like a 28mm carburetor and high-end racing exhaust.
| Bore | 50mm |
|---|---|
| Displacement | 86cc |
| Tuning Level | High-end Racing |
| Exhaust Diagrams | 190° |
| Cylinder Material | Aluminum (with Nikasil coating) |
| Stroke Crankshaft | 44mm |
| Transfer Diagrams | 130° |
| Recommended Squish | 0.90mm +/- 0.10mm |
| Piston Pin Diameter | 12mm |
| Connecting Rod Length | 85mm (for horizontal Minarelli version) |
| Effective Compression Ratio | 8.1:1 |
| Geometric Compression Ratio | 14.8:1 |
| Warranty | Not explicitly stated, typical for racing parts is limited or none due to high stress. |
| Weight | 4.04 kg (Maxi Kit with Crankshaft) |
| Dimensions | Bore: 50mm, Stroke: 44mm |
The Top Performances TPR 86cc kit is a competition-focused big-bore kit for 50cc engines, utilizing a long-stroke 44mm crankshaft and a 50mm bore aluminum cylinder to achieve 86cc. It is designed for maximum power output in racing scenarios, demanding supporting high-performance parts for optimal results (e.g., 28mm carb, inner rotor ignition, racing exhaust). Engine case milling is required to fit the 44mm stroke crankshaft.
Yes, this Maxi kit TOP PERFORMANCES RACING TPR aluminum 86cc with crankshaft (86TPR) is 100% genuine Top Performances (TPR) hardware. All our products are verified by certified technicians and come with clean serial numbers ready for service contract registration.
This Maxi kit TOP PERFORMANCES RACING TPR aluminum 86cc with crankshaft includes our standard 3-Year Warranty covering all manufacturing defects. We also offer advanced replacement options for minimal downtime.
We offer free ground shipping which typically takes 3-5 business days. Expedited shipping options are available at checkout for faster delivery.
Yes, we have a 30-day return policy on all products. Restocking fees may apply for opened items. Please see our return policy for complete details.
Please check the specifications tab for detailed compatibility information. Our technical team is available to assist with compatibility questions for the 86TPR.