All attempts to get more acceleration out of an engine with little power, for example with a different clutch or variator, are usually unsuccessful, as they only try to transfer the available power perfectly to the road. If there is little power available, even the best sports variator can do little to improve acceleration. That is why our base kits start directly where the power is generated, in the heart of the engine. Here, not only is the torque greatly improved with the help of a larger displacement, but the inner cylinder design of the scavenging channels and their larger dimensions also considerably improve performance across the entire rev range.
The cylinder we have selected, the DR 70, which has proven itself over decades, is the proverbial jack of all trades. The DR combines a very good starting torque with a wide range of torque under load. This enables it to master the normally difficult balancing act of good acceleration and high top speed and also responds very well to further tuning measures such as a sports exhaust.
The kit contains the basic parts to enable the engine to develop its full power. An open intake manifold and larger carburetor allow the intake tract to breathe freely, while the cylinder responds with a greatly improved performance and better durability thanks to increased internal cooling. The sets can be easily combined with the standard exhaust, are then absolutely inconspicuous and already considerably more powerful than with a standard cylinder.
An inconspicuous sports exhaust in a standard design, such as those offered by Tecnigas or LeoVince, rounds off the overall package perfectly. Even better performance in combination with a quiet exhaust with approval already makes a 50cc scooter a very fast vehicle that does not draw attention to itself in everyday life through noise and revs.
In order to be able to individually adjust the carburettor to the different existing conditions, such as a sports exhaust, each kit includes a jet set for the respective carburettor. If a main jet that is too small is used, the engine can become lean within a very short time and destroy the cylinder. The basic rule for a durable and well-tuned engine is very easy to realize. It always starts with choosing a main jet that is so large that it causes the engine to stutter under load. Starting from this, you slowly work your way down, i.e. starting with a jet size 88, for example, you select a smaller and smaller jet size (86, 84, 82 etc.) (in the respective jet gradation) until the scooter no longer stutters under full load. This gives you a very good starting point for further fine-tuning via the carburettor needle, secondary jet, etc.
A DR 70 with a 17.5 mm carburettor and a corresponding exhaust already mobilizes around 9 hp at the rear wheel, which means it could easily pull a longer gearbox if a further increase in top speed is desired.
Conclusion: All in all, the foundation stone for a solid engine tuning that remains suitable for everyday use and low in consumption despite the increased power.
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