HOT CAMS Camshaft - Stage 1 Yamaha YFM660R 4011-1Developed on test benches and tested by leading teams, HOT CAMS camshafts are available in three levels. Stage 1 : increases torque and power with no additional modifications. Ideal for basic tuning. Stage 2 : better suited to large machines, requires further improvements such as hi compression pistons and larger carburetor to deliver its potential. Stage 3 : specifically developed for Supermotard or to increase cylinders (use original valve springs
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