Mega ZX21 DSII

Mega ZX21 DS II (development stage II)

This Picco Micromotori made engine has been further developed to improve durability. The performance, combined with low fuel-consumption was already very good, but has improved further.

The combination of a lighter piston and lighter piston pin and redesigned conrod creates a more durable and higher reving engine. The cylinder head has been sligtly modified to reduce vibrations. The superbly machined one pieces balanced crankshaft has a nice black finish.

The EFRA 2033 pipe with conical header ( # 203045) is the best working option for 3-chamber pipes and the 9897 pipe for the 2-chamber pipes (#203013 = outlaw).

Crankcase

This 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

The cooling head has been redesigned to have thinner fins to reduce overall weight and to improve airflow. 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 Symbol, ZX21 logo, DSII logo and the engine categorisation symbols, all laser etched.

Combustion Chamber

Made from the finest quality alloy this combustion chamber is precision made to ensure a prefect seal even under extreme temperatures. Glow plug is not supplied (recommend Mega 7 Cold #200171).

Crankshaft

Made from high strength steel the crankpin has now been incorporated into the single piece crankshaft and then further hardened using a special treatment. The fuel flow through the crankshaft has also been improved to enhance overall engine performance.

Carburettor

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 venturies that can be easily interchanged to fine tune your fuel economy.

Piston & Conrod

This machined piston features 2 rings around its circumference for aiding lubricaton and, along with the piston pin that has also been lightened, features 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.

Sleeve

This 7 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.

Backplate

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