Description

race alternator kit for BMW S1000RR (2009-18) and HP4 (2012-15)

With a rotor of only 164 grams and 45 mm in diameter, it achieves greater throttle response, less gyroscopic forces and more power in any rpm range, in addition to removing weight at the end of the crankshaft, it also significantly reduces inertia in the crankshaft by reducing the diameter of the original rotor by less than half.

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