POWER KIT EXTRA UPGRADE TO 1000CC - BMW R75, R80, R90 LATER MODELS 1975-1980/ SIEBENROCK
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The kit contains Nikasil coated cylinders with lighter (150g), spontaneous quiet running pistons. The kit also contains new piston rings, piston pins and stainless steel push rod tubes already installed in the cylinders. The piston shape is specially designed to require no further modifications to the head.
NOTE: The cylinders have groove at the base but do NOT require the rubber Oring even it it seems it needs the Oring.
The conversion increases torque and power over the entire range of rpm's from 57Nm to 72Nm and the horsepower increases from 49.3 to 59.2 hp and can even reach 63.1hp on the R80R models.
See preview of Siebenrock Expert Opinion on Modification and Installation Instructions.
INCLUDES FREE GASKET TOP END KIT!
Vehicle Manufacturer: BMW
Application: BMW Airhead Models
Make/Model: BMW R75/6, R90/6 and R90S from 9/75 and R75/7, R80/7, R80RT models
Model Years: 09/1975 - 9/1980
Manufacturer #: 1100085 Siebenrock