for R100 models up to 9/1980
More power and torque for all R100 models (up to 1980) in the complete range of the numbers of revolutions. Also have a look at Replacement Kit Extra (article 1100105).
Gasket set article 1100102 is required for installation.
Less exhaust fumes and lower fuel consumption. The forged pistons are about 110 grams lighter than the originals parts. With a compression of 9,5.