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MXS Cylinder Kit "GP90" stroke=45mm Yamaha Aerox / MBK Nitro

MXS Racing Item no.: MXSGP008

MXS Cylinder Kit "GP90" stroke=45mm Yamaha Aerox / MBK Nitro


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Data Sheet
Suitable for (46)


Maxiscoot and MXS Racing proudly present the result of many years of development: the MXS 90cc Cylinder Kit GP2 (45mm stroke) MBK Nitro / Aerox! And, as a matter of course, to be had for a very good price!

The MXS 90cc Cylinder Kit GP2 (45mm stroke) has an original patented design and includes a 90cc cylinder (d=50mm / stroke=45mm / conrod 90mm => 88cc). These cylinder kits were developed for "Hyper Racing" and are, accordingly, extremely powerful!

Among the new developments for version GP2 - differently shaped exhaust ports and a newly designed combustion chamber for the cylinder head to boost the performance of the MXS cylinder kit even more. In combination with the right components, but without any additional modification, this kit can reach between 26 and 28hp. The special transfer port design will give you phenomenal torque of 18N·m - even in the low rpm range!

The MXS GP2 90cc cylinder is very powerful at take-off, has impressive acceleration and top speed. Thanks to well-thought-out design and the use of top quality materials this kit is also top-of-the line regarding reliability and durability (manufactured in Europe).

The kit has to be combined with the MXS crankshaft GP 45mm stroke (90mm conrod), the MXS exhaust GP90, a 30mm carburetor (38mm would be ideal), a racing clutch, an oversize variator, a "long" transmission and a digital inner rotor ignition (Stage6 R/T).


  • You'll have to mill in the front of your crankcase a little to make room for the connecting rod and the cylinder base (manual included)
  • It is possible to get even more power out of this kit by using a racing combustion chamber for the cylinder head that is sold separately (can only be run with high-octane fuel); the kit can now easily reach 28 / 29hp.


Data Sheet

Name MXS Cylinder Kit "GP90" stroke=45mm Yamaha Aerox / MBK Nitro
Item No. MXSGP008
Brand MXS Racing
Homologation No
Displacement 90cc
Stroke 45 mm
Conrod Length 90 mm
Product Line Hyper racing
Material Aluminium
Engine Type 2-stroke
Cooling Type LC
Bore 50 mm
Piston Pin 12 mm
Number of Piston Rings 1
Cylinder Head Included

Your product goes with the following manufacturers and their models:

Adly (Her Chee)

AirTech 50cc LC


Area 51 LC

Gulliver 50cc LC

Rally 50cc LC

SR 50cc LC (1994 - 1997) - Minarelli horiz.

SR 50cc Netscaper LC - Minarelli horiz.

SR 50cc Racing LC (before 2000) Minarelli

SR 50cc Stealth LC - Minarelli horiz.

Sonic 50cc LC


491 50cc RR LC (before 2003) - Minarelli horiz.

491 50cc RR Replica LC (before 2003) - Minarelli horiz.

491 50cc ST LC (before 2003) - Minarelli horiz.

491 50cc Sport LC (before 2003) - Minarelli horiz.

K2 50cc LC - Minarelli horiz.


Ark 50cc LC - Minarelli horiz.

Eikon 50cc LC - Minarelli horiz.


GTR 50cc LC - Minarelli horiz.


GSP 50cc LC


Dragster 50cc LC


Ark 50cc LC


Galactica 3.0 50cc LC


Speedjet 50 LC 2-stroke


MachG 50cc CAT LC (after 2003)

MachG 50cc LC (before 2003)

Nitro 50cc CAT LC (after 2003)

Nitro 50cc LC (after 1999)

Nitro 50cc LC (after 2013)

Nitro 50cc LC (before 1999)

Nitro Naked 50cc LC

Nitro Naked 50cc LC (after 2013)


F12 Phantom 50cc LC

F12 Phantom 50cc LC (after 2004)

F12 Phantom R 50cc LC

F15 Firefox 50cc LC

F15 Firefox 50cc LC (after 2004)


Crogen RS 50cc LC 2-stroke

Magnet RS 50cc LC 2-stroke


Speedjet RS 50cc LC


Aerox 50cc LC (after 1999)

Aerox 50cc LC (before 1999)

Aerox 50cc LC CAT (after 2003)

Aerox Naked 50cc LC (after 2013)

Aerox Naked 50cc LC CAT (after 2003)

Aerox R 50cc LC (after 2013)

Jog RR 50cc LC (before 2003)

Jog RR 50cc LC CAT (after 2003)

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