Ace Redrive – V-Twin 627–993cc Toothed Belt PSRU
Maximum power transfer, zero slip — the precision toothed belt PSRU for high-output V-Twin engines, now available in the USA.
When you need every horsepower to reach the propeller without slippage, the Ace Aviation Toothed Belt Redrive is your answer. Designed for builders running higher-output V-Twin engines up to 50HP, this unit uses a precision toothed (synchronous) belt for a positive, locked drive ratio — no belt creep, no power loss under load. With over 700 Ace redrives flying worldwide, this is a proven platform trusted by builders across the globe.
As the exclusive US & Canada distributor, Ace Redrives USA ships from domestic stock — no more 6–12 week overseas waits or surprise tariff invoices.
🔧 Engine Compatibility
Fits V-Twin engines from 627cc to 993cc, including:
- Briggs & Stratton (all popular models)
- Predator 670cc
- Honda V-Twin
- Subaru V-Twin
- Kohler Command V-Twin
- Kawasaki V-Twin
- Lifan V-Twin
- Yamaha V-Twin
- And many others with a standard parallel crankshaft (1" to 1-7/16")
⚙️ Technical Specifications
| Drive Type |
Toothed (Synchronous) Poly Belt |
| Standard Ratio |
1.8:1 |
| Redrive Weight |
3.9 kg (8.6 lbs) |
| Bearings |
Premium SKF (industrial grade) |
| Max HP |
Up to 50HP |
| Crankshaft Requirement |
Standard parallel, 1" to 1-7/16" |
| Ships As |
Fully assembled |
🆚 Toothed Belt vs. V-Groove Belt — Which Do I Need?
| Feature |
Toothed Belt |
V-Groove Belt |
| Drive Type |
Positive / No-slip |
Friction-based |
| Best For |
Higher HP, precision ratio |
Budget builds, lower HP |
| Shock Absorption |
Moderate |
Higher (belt slip acts as buffer) |
| Price |
Higher |
Lower |
✅ Why Builders Choose Ace
-
Eccentric Shaft Tensioner — Ace Aviation's signature design lets you dial in belt tension perfectly in under 5 minutes with a single Allen key.
-
SKF Bearings — Industrial-grade bearings built for hundreds of flight hours.
-
Fraction of the Cost — Significantly less expensive than a Rotax gearbox, with comparable build quality.
-
US-Stocked — Ships from the USA. No import delays, no surprise tariffs.
-
Fully Assembled — Arrives ready to bolt on. No machining required.
📦 What's Included
- Complete Ace Aviation Toothed Belt Redrive unit (fully assembled)
- All nuts and bolts for joining redrive components
⚠️ Note: Keyless bush for small pulley-to-crankshaft connection is not included (customer-supplied). Mounting bolts from backplate to engine crankcase are not included (customer-supplied).
Questions about fitment? Contact Ace Redrives USA — we're here to help you get the right unit for your build.
