The all new Sonic ProStock.21 3,5ccm on-road engine is designed especially for club and regional racers that are looking for a competition engine for a good price. Additionally the ProStock.21 is easy to adjust and to handle which helps the racer to focus on driving and setting up the car.
Equipped with a 5 ports sleeve and a CNC machined flat piston the engine provides great power over the entire RPM range while having a very efficient fuel consumption.
The optimized crankcase and the the "knife edged" aerodynamic connecting rod help even more to reduce turbulences inside the engine.
A special turbo combustion chamber with a cooling fin and the lightweight cooling head ensure best heat dispersion to keep the engine temperatur at a moderate level.
High quality ball bearings and a modern composite valve carburetor with an 8mm aluminium
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