Bore 64 mm, stroke 58 mm, grey cast iron, control times: outlet 170°, overflow 120°, inlet - diaphragm controlled, outlet 25°.
The cylinder is delivered with a 24 / 25 mm intake manifold, so the original air filter box can continue to do its job with low noise. Thanks to the very narrow diaphragm block from the karting area there are no space problems to the frame or side cover. Only the cylinder head cover has to be modified slightly because of the intake manifold.
The performance of the kit is early on, so long gear ratios can be driven and a decent cruising speed is already available at a low rpm level. With Mikuni TM 24 carburetor and the Clubman exhaust the power is 13-14 hp. With the old AF NK exhaust, the power output is already 16 hp.
The Granturismo comes with cylinder, intake manifold, reed block, upper conrod bearing, screws and gaskets and the high quality Yamaha piston. Besides its good driving performance the cylinder also convinces with quite moderate consumption values. At 60 mph (96km/h) the carburettor is supposed to deliver significantly less than 4 litres of fuel.
FAZIT: The Granturismo is the ideal cylinder for all those who don't want to change their vehicle optically but at the same time don't want to miss out on extra power to be able to go on longer tours in a relaxed way. AI-translation/sub>