Malossi 50mm Big Bore Cylinder & Stage 6 44mm Stroke Crank Kit

When it comes to capacity, Malossi's 86cc cylinder kit is unbeatable. The cylinder is based on the smaller 77cc big bore kits, however with the difference that the 86cc version can only be used with the special big bore crankshaft with 44mm stroke and 13mm gudgeon pin.

Due to the extreme increase in capacity, 26 hp are possible. In order to install this cylinder, the crankcase has to be milled to 56.7mm.

The new BIG BORE Ø 50 cylinder kit comes from the technology of the famous Malossi 7 ports cylinders. They are designed for both Minarelli and Piaggio engines.

All pilots, thrilled about the news, wished to test them. The expectations were not disappointed : the power increase and the absolute reliability proved, once again, the high quality of the products and Malossi professionalism.

Technical specifications:

- 7 ports cylinder, H2O, gravity melted in aluminium alloy, cylinder casing coated in cermetal, lapped with diamond tools

- Bore 50

- 1 ring, strengthen and rounded head piston

- KDN5 cast iron piston ring Ø 50 x 0.8

- Modular head in primary aluminium alloy, drained, with calculated and orientated convoying system of cooling circuit.

Technical note : the BIG BORE cylinder kits must be used only coupled with Malossi crankshafts.

ATTENTION: to grant the due stiffness to the cylinder kit, the cylinder has an introduction diameter into the crankcase of 56,2 -0,1/-0,2 mm.

Therefore, it is necessary to bore the crankcases with a boring bar of 56,7 + 0,0/0,1 mm for a depth of 21 mm.