My Kep's 21 2006 rigger with Sirio S21 engine - own design cooling head & flywheel design. This flywheel is made of SS material - I have aluminium ones also. Its really short over the crank as I use the std SG type car crank with the 5 mm part cut off. Aquacraft linkage rubbers, russian 3:rd channel needle. Notice simple and light linkage with Z bended Du-Bro wire.