The 75cc D.R. is one of the most frequently used cylinders in the fifties sector. A very wide usable speed range and a powerful starting torque make this cylinder the first choice when riding in pairs. Its outstanding durability and versatility make it a trouble-free companion.
speeds of 65-75km/h can be reached without any problems. For the 40km/h version of the 50N, make sure to use an open exhaust and replace the SHB 16/10 carburettor with that of the 50km/h version (SHB 16/16).
The compression is about 10,7:1 and it is not necessary to install a bigger carburetor or a longer gear ratio.
When using a SHB 16/16 carburetor and the unthrottled original exhaust the main jet should be increased to 70-74.
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