Engine crankshaft RACING 7564085

Schmitt «Sportfreund» crankshaft with a 44 mm stroke and 85 mm connecting rods, compatible with Simson / Mokick S51, S53, S70, S83, SR50, SR80, KR51/2 mopeds with M531, M541 and M741 engines. The standard is redefined here! A precision, hand-crafted and balanced crankshaft with a 44 mm stroke and 85 mm connecting rods, designed for standard and mid-range tuning engines. The reinforced joint between the crank pin and crank web makes the Schmitt crankshaft noticeably stiffer and more resistant to high revs. With noticeably smoother running and greater acceleration capacity, the Schmitt crankshaft stands out with its reinforced connecting rods and silver-plated needle bearing. The connecting rod is guided by the lower connecting rod bearing with silver-plated thrust washers, eliminating the need to fit the complicated adjustment washers on the piston pin. Special attention has been paid to the fit precision of the ignition taper on this crankshaft, maintaining the original 1:5 ratio. This means that inaccuracies when fitting modern flywheels are no longer a problem. Runout and bearing seat fit also meet the latest measurement and manufacturing standards and are not comparable to those of mass-produced or Asian-made crankshafts. Technical data: Balance factor: ≈64 % with Ø38 mm pistons, ≈59 % with Ø41 mm pistons, ≈52 % with Ø45 mm pistons Weight: 1380 g Connecting rod: 85 mm Stroke: 44 mm