This is for bikes produced up to 09/1975, with a 97mm crankcase opening and 16mm diameter pushrod tubes.
This kit consists of two nickasil plated alloy cylinders, two graphite forged, light weight pistons (each weight reduced by approx. 140g), the corresponding sets of piston rings and gudgeon pins.
Supplied with stainless steel pushrod tubes fitted.
A top end gasket set is also supplied with this kit, excluding the barrel base O-ring as this is not used in the upgrade kit. You can fit ENA19125 or use OIA62376 instead.
They are designed for straightforward installation in about two hours. Benefits include an increase in power from 49.3 to 59.2hp with the R80GS or 63.1hp for the on road R80 models (using standard BMW 1000cc barrels and pistons with 800cc heads can result in a decrease in engine power output!)
In addition to increased power outputs, the kit reduces emissions and fuel consumption and increases torque from the original 57Nm to 72Nm, and produces a much smoother spread of useable torque throughout the rev range. More details available on request. Compression ratio 9.5:1.
The Bosch spark plug WR6DC is required for this conversion; see SIA38145A ( please order separately )