An air cleaner fitting structure for a motorcycle forms an ideal frame line without being limited to the position of the internal combustion engine and the fuel supply system, which can bring about favorable maintenance conditions. In an air cleaner fittin...

The invention provides a balancer-fitting configuration of an internal combustion engine. With the balancer-fitting configuration, the vibration control of an internal combustion engine with forward-inclined cylinders is achieved effectively by using paire...

A two-cycle internal combustion engine has an ignition timing that varies with engine speed. A plurality of ignition patterns (the relationship between ignition timing and engine speed) arc used. The engine exhaust gas temperature is sensed and is used to ...