Industrieweg 106, 2651 BD Berkel en Rodenrijs, Pays Bastél. 0031-10-5199210
The big side valve singles. Here are the main differences:M20 is 500cc and has a cast iron headM21 is 600cc and has an alloy head and differently shaped piston.
Copper fuel line with nuts, zinc plated. The carb end is 1/4GAS ( = 12mm), the fuel tap ends are 7/16GAS ( = 10mm)
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