Industrial engines. They are still used by several manufacturers (most notably Blata on their entry level bike) and typically produce between 2.5 and 3.5 horse power (hp). All are air-cooled. Tuning and performance parts are very limited.
The Chinese 47/49cc. These engines are used in the Chinese made mk2, and mk3 minimotos. They are air cooled and produce between 2.5 and 3.5 horse power (hp). This engine is different from the industrial engine that is used in the Blata, as it is specifically created for mini moto use.
Polini 4.2 engine. This is the basic Polini engine and, as its name suggests, it produces 4.2 hp in standard form. It is air-cooled and uses the series I crankcase with the 3-port cylinder. There is plenty of scope and parts for tuning but few people bother because most racing classes for the 4.2 wont allow any modifications.
Polini 6.2 engine. The top end of this engine is the same as the 4.2 (3-port) but is available with either water or air-cooling. The bottom end uses the series II crankcase. This helps to make it more powerful. Race regulations dont allow modification to the engine internals but do allow performance parts, the most...
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