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MXS Tuning Kit "Racing" 70cc MBK Booster / Stunt

MXS Custom Item no.: MS-PKMMXSRACE

MXS Tuning Kit "Racing" 70cc MBK Booster / Stunt


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Data Sheet
scope of delivery (3)
Suitable for (32)


A powerful combination of high-end racing components for little money - the MXS Tuning Kit "Racing" (12mm) MBK Booster / Stunt.

Speed freaks will be thrilled by this racing kit (not street-legal!) with its incredible acceleration and fantastic top speed.


The kit includes:


All of these top quality components are well-tried and tested with successful results in drag racing. With the right set-up (28mm carburetor and oversize variator), the MXS Tuning Kit "Racing" (12mm) MBK Booster / Stunt can easily reach 19hp!

Data Sheet

Name MXS Tuning Kit "Racing" 70cc MBK Booster / Stunt
Brand MXS Custom
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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  1. MXS Racing

    MXS Racing Exhaust Yamaha BW's / Slider

    Not available.
    Straight out of our own MXS Custom workshops, the result of many months of development - MXS Racing Exhaust 2014 MBK Booster / Stunt (Minarelli vertical). Here are the details: Thin sheet metal expansion chamber, made by using a special, highly accurate manufacturing technique Laser-cut "MXS Racing" logo (expansion chamber) Weather-resistant clear coat Brushed aluminium silencer Laser-cut bracket 2-part take-apart flange Removable Venturi tube (stinger pipe) Silencer protected by rubber lining underneath the clamp Heat-resistant "MXS Racing" sticker (silencer) street-legal / with CE-homologation This exhaust is definitely state-of-the art in terms of performance and quality. It was developed by MXS, Maxiscoot's racing department, to go with our MXS Racing 70cc cylinder. In combination with this cylinder, it will get you 1 to 1.5hp more when compared to the previous version. As a (hyper) racing exhaust, it is of course most powerful at high rpm and can be combined with other 70cc racing and "Hyper Racing" cylinders. Designed for racing + road use, WITH CE-homologation! Ready-to-install, all small parts needed for mounting are included. Learn More

    MXS Racing

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  2. MXS Racing

    MXS Cylinder Kit "MXS Racing" 70cc piston pin...

    Not available.
    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 right off the bat, in combination with the right set-up, but without any modifications to the cylinder or the bottom end, 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 full-circle crankshaft (12mm). You will have to use a Hyper Racing 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. Diameter: 47.6mm - Stroke: 39mm Note: piston pin = 12mm. Learn More

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  3. Stage6

    Stage6 Crankshaft HPC piston pin=12mm

    Shippable in 10 to 12 working days.
    Stage6 HPC Crankshaft MBK Booster / Stunt, HPC (High Primary Compression) crankshaft for 12mm piston pin. HQ full-circle crankshaft for higher primary compression in the crankcase. It is entirely made of hardened steel, with reinforced connecting rod. Stage6 opted for a full-circle design instead of the standard design with inserts; this way the crankshaft has greater rotational inertia at high rpm. Excellent balancing (45%) reduces vibrations that stress materials and may lead to engine failure.  It is suitable for 50cc and 70cc racing and even "Hyper Racing"engines. We have had excellent experiences when combining it with our MXS 70cc racing cylinders.  Details: excellent balancing full-circle reinforced connecting rod 12mm piston pin Learn More


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