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2Fast Cylinder Kit 86cc stroke=44mm Yamaha Aerox / MBK Nitro

2Fast Item no.: TFAST025

2Fast Cylinder Kit 86cc stroke=44mm Yamaha Aerox / MBK Nitro


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Data Sheet
Suitable for (46)


"2Fast" - a name that stands for excellent performance! 2Fast 86cc Cylinder Kit (44mm stroke / 50mm diameter) MBK Nitro / Aerox (Minarelli horizontal LC), also available as tuning kit (cylinder kit + crankshaft), only for Minarelli engines.

These cylinders differ from the "old" 47.6mm ones regarding several features:

  • Exhaust port is divided and bridged (no auxiliary boost ports).
  • Transfer ports were redesigned to match the new size.
  • 50mm piston with 13mm pin (HQ Malossi piston Big Bore 86cc)
  • Designed for 90mm connecting rod, new cylinder head shape, etc.. 

It has to be used with crankshafts with 44mm stroke, a 90mm connecting rod and a 13mm piston pin (small end bearing 13x17x17.5mm). Definitely one of the most powerful cylinder kits available in this category, since it will give you 25/26hp out of the box, without any modifications!

To unlock the enormous potential of this kit, we recommend combining it with a 30mm carburetor (minimum), a digital internal rotor ignition and a "Hyper Racing +70cc" exhaust (the "2Fast 86cc exhaust" is probably the best exhaust to go with this kit).

NOTE: you'll have to mill in the crankcase to make room for the cylinder base and the 44mm crankshaft (instructions in manual).

Data Sheet

Name 2Fast Cylinder Kit 86cc stroke=44mm Yamaha Aerox / MBK Nitro
Item No. TFAST025
Brand 2Fast
Homologation No
Displacement 86cc
Stroke 44 mm
Conrod Length 90 mm
Product Line Hyper racing
Material Aluminium
Bore 50 mm
Piston Pin 13 mm

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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