Malossi MHR Overrange Torque Driver (Torque Drive) for Minarelli long – linear slope for maximum performance

Unlike many tuning torque drivers, the original torque driver has a rather curved slot progression. This often leads to a slight lack of initial acceleration – and when accelerating again, the RPM usually does not increase as abruptly.

The Malossi MHR Torque Drive starts here: With linearly optimized slopes, you get noticeably better acceleration and an optimized top speed. Manufactured in the usual very high Malossi quality from high-quality nitrided steel, this torque driver is particularly recommended for heavily tuned engines.

Especially for setups on popular scooters such as Yamaha Aerox 50, MBK Booster 50 or Aprilia SR 50, the Overrange concept is a strong basis if you tune it cleanly and rely on quality.

Advantages / Features

• Linear slopes (optimized progression) for better acceleration and top speed
• Very high, proven Malossi MHR quality
• Material: high-quality nitrided steel
• Recommended for heavily tuned engines
• Overrange (oversize) for performance-oriented setups

Important Notes on Installation & Tuning

• After using this torque driver, the variator must be retuned (weights, if necessary, counter spring).
• Overrange (oversize of the torque driver): The engine housing must be slightly modified, otherwise the torque driver will not fit.
• Perfect complement: Malossi Multivar variator.

Details / Comparison Numbers

• Version: Malossi MHR Overrange / Torque Drive
• Suitable for: Minarelli long
• OEM No. (for comparison purposes): 61 9733, 619733

Compatibility (Vehicles)

• Aprilia: Area 51 50; Scarabeo 50 2-stroke 1999-2009; Amico 50 GL; SR 50 Stealth LC water; SR 50 LC water 1994-1997; Gulliver 50 LC water; SR 50 WWW AC air 2000; SR 50 AC air 1994-1997; SR 50 Netscaper LC water; Rally 50 LC water
• Italjet: Dragster 50; Pista 50; Yankee 50; Scoop 50; Pista 2 50
• KTM: Go 50; Quadra 50; Tempo 50; Chrono 50; Ark 50 AC air; Ark 50 LC water
• MBK: Booster Track 50; Sorriso 50; Ovetto 50 from model year 07 2007 to model year 07 2007; Flipper 50; Nitro R 50 2-stroke 2013; Stunt Naked 50; Nitro Naked 50 2013; Booster 50 12 inch 5SA 5YA 2001-2003; Nitro 50 Naked 1PL 2013; Booster 50 NG 1999
• Malaguti: Ciak 50 2-stroke; Centro 50 Minarelli engine 2008; Yestarday 50; F12 Phantom 50 LC water 2000-2004; F12 Phantom R 50 LC water; F12 Phantom R 50 AC air; F12 Phantom 50 AC air 2003-2006; F15 Firefox LC water 2004; F15 Firefox AC air 2004
• PGO: G-Max 50; PMX 50
• Yamaha: Zuma II 50 vertical engine; Aerox R 50 2013; Why 50; Aerox R 50 Naked 2013; BWs 50 Original SA231 2011; BWS 50 NG 1999; Jog R 50 AC air; BWs 50 Naked SA231 2016; BWs 50 Easy 2DW 2013; Aerox 50 Cat 2003

Why Malossi MHR?

For years, Malossi has stood for precise manufacturing, thoughtful performance solutions, and reliable materials in scooter tuning. Especially with demanding setups (e.g., on Yamaha Aerox 50, MBK Booster 50 or Aprilia SR 50), this quality is evident in clean function and reproducible tuning.