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Motoforce Sport MKII 70cc Cylinder Kit- Aerox/ Minarelli LC



The Motoforce Sport MKII 70cc for Yamaha Aerox is a grey cast iron cylinder suitable  for daily use.
It offers excellent value for money and is an ideal entry-level solution for those considering providing your engine with more torque and power.
This cylinder is a 'sport' cylinder meaning low revving reliability (suitable for use on standard crank) for everyday use but still with a very substantial increase in power.

Depending on exhaust fitted this cylinder will reach approx 9-10 hp.
Comes with cylinder head, gasket set and piston.

10mm gudgeon pin.

Use short reach BR8HS spark plug with this kit.

Motoforce MF26.16601

  • Malaguti 50cc F12,F15
  • MBK (liquid cooled)
  • MBK Nitro 50
  • Yamaha Aerox 50
  • Yamaha Jog RR (liquid cooled)
  • Q. hi, what size is the piston in mm,just so i can order a ring compressor?
  • A.

    hi, you don't need a piston ring compressor for these, they can be easily fitted by hand

  • Q. Hi , I have a Leo Vince ZX exhaust (de restricted ) on my AEROX 50 Would it be suitable for above cylinder ? Not looking for a radical tune. What carb should I use?
  • A.

    Go for the Stage6 Streetrace kit instead if you want to use a Leo Vince ZX pipe.
    Aerox Stage6 Streetrace Kit
    The Leo Vince pipe is quite mild but will work fine with the Streetrace albeit not at the kits full potential.The Motoforce kit however is really quite revvy and will not work as well when being 'restricted' by the ZX pipe as the Streetrace cylinder kit will.
    The standard Aerox carb is really quite restrictive at 12mm and a sports 70cc kit will see a significant improvement on an Aerox when fitted with a 17mm or 19mm Dellorto carb.
    See this blog for more details.