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Hi Knut,You are absolutely right. The reduction of the cylinder height of the G80CS and G85CS engines comes from the realization of the RICKMANN-Métisse motorcycles with Matchless engines - There was not enough space between the engine and the frame to be able to remove the cylinder head, without falling down the engine. To resolve the problem, on the advice of Andy LEE, Ken DeGroome and I have modified the engines by mounting a shorter G50 rod, to reduce the cylinder height by 12.7mm (1/2 ") and so to be able to easily dismount the head !! In addition, the crankshaft had less inertia and the engine was more smooth - I have often mounted G50 pistons to bring the engine to 540cc.As for my Typhoon engine, I had simply adapted the height of the piston and its dome (piston manufactured especially in Switzerland) so as not to touch the G85CS cylinder height.Jean-Paul
Hi Knut,
You are absolutely right. The reduction of the cylinder height of the G80CS and G85CS engines comes from the realization of the RICKMANN-Métisse motorcycles with Matchless engines - There was not enough space between the engine and the frame to be able to remove the cylinder head, without falling down the engine. To resolve the problem, on the advice of Andy LEE, Ken DeGroome and I have modified the engines by mounting a shorter G50 rod, to reduce the cylinder height by 12.7mm (1/2 ") and so to be able to easily dismount the head !! In addition, the crankshaft had less inertia and the engine was more smooth - I have often mounted G50 pistons to bring the engine to 540cc.
As for my Typhoon engine, I had simply adapted the height of the piston and its dome (piston manufactured especially in Switzerland) so as not to touch the G85CS cylinder height.
Jean-Paul