BMW Airhead Boxer 1000cc Conversion Kit (R75, R80 & R90 - 9/1975 on)

BMW Airhead Boxer 1000cc Conversion Kit (R75, R80 & R90 - 9/1975 on)


BMW Airhead Boxer 1000cc Conversion Kit (R75, R80 & R90 models made from 09/1975 on)

Power kit to replace your existing engine cylinders on your BMW R75, R80 and R90/6 & R90S with alloy Nikasil plated ones mated with forged, lighter (by circa 140gr) pistons and  its rings, gudgeon pins and circlips. 

Available for all R75/5 & R75/7, R80 (/7 & Monolever) and R90/6 & R90S engines, please state your engine number.

It includes:

  • Pair of new alloy Nikasil plated cylinders
  • Pre-fitted stainless pushrod tubes (4)
  • Pair of lighter forged pistons offering 9.5:1 compression ratio, 
  • Complete set of piston rings
  • Piston gudgeon pins and circlips
  • All the necessary gaskets and rubbers to fit it on your engine 


It comes complete with pre-fitted stainless steel pushrod tubes and all the necessary gaskets and rubbers to fit it on your engine.

Compression of 9.5:1, this kit offers a noticeable and usable increase in power. Using the R80 models with 32mm CV Bings as a example, this kit typically shows a real output increase from 49HP to 59-63+, depending on carburetion, ignition, camshaft fitted etc.

Very usefully, this Conversion kit eliminates the typical BMW torque dip between 4000 and 5000 rpm.

Thanks to its modern materials and very accurate machining and tighter tolerances offered by new technologies, not only this kit offer a noticeable improvement in performance but also a longer working life and quieter running.

Particularly attractive option if your engine cylinders bores/pistons are worn out as this kit offers a straight replacement at lower cost of the original replacement components.

For full performance advantage, we would suggest fitting a Sports Camshaft and our Dell'Orto carburettor Conversion Kit. Please see our other listings or contact us for more details.

Straight swap, no modifications are required!


IMPORTANT

1 - Please note that these kits are only available as a straight fit for the R75, R80 and R90 engines made after September 1975 with 97mm cylinder opening the engine block. This kit will NOT fit the earlier engine blocks (70-75).

2 - Specialist fit. Extensive knowledge about these engines and specific BMW Typ 247 engine tools are required to assemble and fit this kit. We strongly recommend that you entrust this job to a competent and renowned BMW specialist if uncomfortable or lack experience with this type of work.

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