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MXS Cylinder Kit "MXS Racing" 70cc piston pin=12mm Yamaha BW's / Slider

MXS Racing Item no.: MXS31445476

MXS Cylinder Kit "MXS Racing" 70cc piston pin=12mm Yamaha BW's / Slider

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Data Sheet
Suitable for (32)


MXS Racing Kit - Cylinder, Piston and Cylinder Head - designed and developed by MXS, Maxiscoot's Racing Department.

The Nikasil-plated aluminium cylinder has 5 transfer ports and an oval exhaust port. It comes with a HQ single-ring piston (12mm pin) and a high-compression cylinder head (port timings: 196°/132°/134°).

With 19hp out of the box and in combination with the right set-up, but without any major modifications, this kit will wow even the most demanding pilot.

To unlock the full potential of this cylinder kit, we recommend a 28mm carburetor (at least 21mm), a "Big Valve" reed valve, a digital inner rotor ignition and a high-quality racing crankshaft.

You will have to use a high-end acing exhaust to go with this kit, otherwise the cylinder will overheat! We recommend the MXS Racing 2014, Stage6 R1400 or at least the Yasuni Carrera 16 (flange diam. 26mm and stinger pipe diam. at least 16mm!).

The kit comes with complete piston (pin, circlips and ring included) and the proper gaskets for mounting. To make sure to get maximum power and reliability out of this cylinder kit, you should definitely adjust "squish clearance" when mounting it (cylinder spacers are included).

For vertical Minarelli engines.
Bore: 47.6mm - Stroke: 39mm
Note: piston pin = 12mm.

Data Sheet

Name MXS Cylinder Kit "MXS Racing" 70cc piston pin=12mm Yamaha BW's / Slider
Item No. MXS31445476
Brand MXS Racing
Homologation No
Displacement 70cc
Stroke Original
Conrod Length Standard
Product Line Hyper racing
Material Aluminium
Bore 47,6 mm
Piston Pin 12 mm

Your product goes with the following manufacturers and their models:

Adly (Her Chee)

Rapido 50cc


Amico 50cc AC (1991 - 1992)

Amico 50cc ac (after 1993)

Amico GL 50cc AC

Amico Sport 50cc AC

SR 50cc AC (before 1994) - Minarelli vertical


Pista 2 50cc AC

Pista 50cc AC

Scoop 50cc


Booster 50cc AC (1992 - 1999)

Booster 50cc AC (after 2004)

Booster Next 50cc AC (after 1999)

Booster Next 50cc AC (before 1999)

Booster One 50cc until 2013

Booster Rocket 50cc AC

Booster Spirit 50cc AC (before 2004)

Booster Track 50cc AC

Stunt 50cc AC

Stunt 50cc AC CAT (after 2004)

Stunt Naked 50cc AC


BW's 50cc AC

BW's 50cc AC (after 2004)

BW's Bump 50cc AC

BW's Easy 50cc 2013

BW's NG 50cc AC (after 1999)

BW's NG 50cc AC (before 1999)

Slider 50cc AC (before 2004)

Slider 50cc AC CAT (after 2004)

Spy 50cc AC

Target 50cc

Zuma 50cc AC

Zuma II 50cc AC

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