Grey cast iron cylinder with a full displacement plus to 70ccm. The processing is on a very good level and is to be compared throughout with the quality of the series cylinders.
The cylinders of the company D.R. (Diffusione Ricambi) enjoy a very good reputation. Already in the shift scooter sector DR has developed powerful cylinders with a long life span at a reasonable price. So one can almost make a general recommendation for the automatic sector for those who want to make their scooter faster without much effort.
The DR distinguishes itself by a generous plus in displacement, optimized control times and above all larger channel widths, especially the overflow valve. The DR philosophy is to give the cylinders a wide speed band with plenty of torque from the lower speed range. This also makes the DRs interesting for tuning mufflers, so there's not much effort required.
The DRs respond extremely well to further -after-treatment - by means of a suitable exhaust and carburetor. This way the performance is increased again significantly without any loss of reliability.
The 70cc D.R. is our secret favourite. The price/performance ratio is very good and the performance is almost at Polini level. But the D.R. has the richer torque and rides fuller. Longevity is not an issue with these cylinders and they even forgive the one or other jam in case the joy of experimentation was too much.
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