Mega ZX21 DSII+ EM


High performance competition level engine, hand worked and assembled by Eduardo Picco, this motor is based on the durable and high performance ZX21 DSII+.


This Eduardo Modified (EM) version of the ZX21 DSII+ 3.5cc motor features internal work done by engine master Eduardo Picco. The crankshaft has been lightened and filled with red silicone, while the 7+2 port liner has been worked with tear dropping done on some of the ports to optimise fuel flow and improve performance. Each engine uses hand selected parts including the conrod and piston liner, and all have been had assembled by Eduardo himself.



This black 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 carburettor 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.



Made from high strength steel the crank pin is incorporated into the single piece crankshaft and then further hardened using a special treatment. The shaft has been further lightened, and filled with red silicone, while the bell crank sports a large scoop for better fuel flow.



This 7+2 port high-density hard-chromed sleeve, offers incredible durability coupled with highly effective porting ensure that maximum revs are achieved as well as producing a wide power band. The liner has also had some tear dropping done on some of the ports to optimise fuel flow and improve performance further.


Piston & Conrod

This machined piston contacts with the liner less, allowing for high revs and more speed. It also features 2 rings around its circumference for aiding lubrication and, along with the lightened piston pin, has changes that reduce the overall weight of the assembly. 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 has been strengthened with more material now surrounding both bushings for better durability.



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. This carburettor comes with 3 different venturi inserts that can be easily interchanged to fine tune your fuel economy.


Combustion Chamber

Made from the finest quality alloy the combustion chamber now features a different profile which is deeper and now features a less sloping entry to the plug which aids the ease of tuning of this motor. This part is precision made to ensure a prefect seal even under extreme temperatures. Glow plug is supplied (Mega 7 Cold #200171).


Cooling Head

The cooling head features thinner fins to reduce overall weight and to improve airflow while the sides of the fins have had the anodising removed for better cooling. The head has also been machined around the edges to allow better access to the engine mount screws. On top of the cooling head is the Mega Symbol, ZX21 logo, DSII+ logo and the new EM logo, all laser etched.



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

Source : Serpent

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