Description Crankshaft 8.1 R-18 for Minarelli horizontal crankcaseCrankshaft with 39,3 mm stroke (original stroke) and 85 mm connecting rod for Minarelli horizontal engines (Yamaha Aerox, Malaguti F12 / F15 and many more) from Italian tuning expert Ottopuntouno (8.1). This is a high-end racing crankshaft made of high-quality steel, with 85mm connecting rod and 18mm crankpin. The crankwebs have a diameter of 75 mm, perfect balancing of the crankshaft is achieved by tungsten inserts. Construction and balancing are perfectly designed for the 70 cc cylinder 8.1 from Ottopuntouno. The crankshaft was developed for use with an OttopuntoUno cylinder, but can of course also be used with other 70 cc or 80 cc cylinders.The R-18 version is designed for installation in a standard Minarelli horizontal crankcase (original / OEM quality), but the case must be slightly milled to make room for the larger crankwebs.Crankweb diameter: 75mmTo ensure optimum performance, we recommend using high quality crankshaft bearings Stage6 by SKF.High-end crankshaftStroke: 39.3 mm (original)Connecting rod: 85 mmCrankweb diameter: 75 mmSmall end bearing: 12x17x15 mmCrankpin: 18 mmBalance factor 50 %Weight: 1.6 kgFor Minarelli horizontal (Aerox, F12, F15, Jog R ...)Made in Italy Questions about the product

• Brand: Ottopuntouno Racing Parts
• SKU: OPU002
• Availability: In stock

Notes and Safety How to change a crankshaft?The crankshaft is one of the main components of the engine and is responsible for the smooth operation of motorcycle, scooter and moped, whether with two-stroke or four-stroke engine. The longevity of the engine depends not only on the proper condition of the crankshaft, but also on the fact that it is properly mounted.For a correct installation of the crankshaft, we recommend our tutorial: Crankshaft disassembly and assembly.How can I tell if my crankshaft is Damaged?A broken crankshaft causes metallic noises, unusual vibrations, leaking oil seals and drastically reduces the performance of the two-wheeler. In any case, the vehicle must be stopped