Mega ZX 21 2005


Mega .21 X high quality engine for use in Off road buggies and monster trucks.
Manufactured with top quality piston and liner set, swiss-made bearings, latest design carburettor, orange cooling head and superbly finished grey anodised crankcase.

High performance at realistic prices, the new Mega ZX21 Rally X proves this by offering truly high performance without seriously denting your wallet.
Made for Serpent by Picco Micromotori in Italy, this engine has a real strong pedigree.


This all new grey anodised crankcase has been forged from high grade aluminium and is therefore very strong and highly durable.
The design incorporates many cooling fins to keep the temperature under control whilst the internal porting ensures optimised gas flow.
To ensure a perfect seal, when the carburretor is mounted, the opening for the carb has been fitted with a rubber o-ring whilst to enable the smoothest possible movement of the crankshaft the casing has been fitted with Swiss-made high quality bearings.
For looks, the side of the crankcase sports the new Mega Symbol on the front side and the ZX21 logo on the rear side.

Cooling Head

This extra large Orange anodised cooling head features 11 cooling fins for regulating the temperature of your engine.
The head has been machined around the edges to allow access to the engine mount screws as well as to make it look nicer.
On top of the cooling head is the Mega logo and ZX21 logo, all laser etched.

Combustion Chamber

Made from the finest quality alloy this combustion chamber for normal plugs, is precision made to ensure a prefect seal even under extreme temperatures.
Glow plug is not supplied.


Made from high strength steel the crankshaft is finished to the highest standard.
It has a large bore intake which is optimised to best accomodate the fuel flow into the combustion chamber.
The big end pin has been designed to be used with a pull start or electrical start system.


This easy to adjust 2 needle carburettor maintains its needle settings, regardless of temperature, thanks to its design and the materials used in its construction.

Piston & Conrod

This super lightweight piston has been machined from high grade aluminium and features 2 rings around its circumference for aiding lubricaton.
The piston has been made using true ABC (aluminium piston, brass sleeve with chrome plating) construction for ultra long usage with little or no visible wear.
Utilising bronze bushings top and bottom the conrod is aerodynamic and lightweight therefore reducing resistance and allowing the piston to move faster.

This 3 port high-density hard-chromed sleeve, offers incredible durability as well as high levels of bottom end power.


The crankcase backplate is cast and features a 0-ring groove and 2 aerodynamic lugs for improved mixture flows and lubrication.


Comes in a newly designed Mega box along with instruction manual, reference sheet, and decal sheets.


Archive Pictures by Fabien Mannien