A method for an engine is presented, comprising, following an engine-off event, positioning a first engine cylinder with an intake valve open, opening a canister purge valve; and purging contents of the first engine cylinder to a fuel vapor canister. In this way, uncombusted fuel that may otherwise be emitted from the engine during a prolonged diurnal soak may be stored within the fuel vapor canister, thus decreasing overall vehicle emissions.

An air intake chamber for a motorcycle is disposed downstream of a supercharger, for pressurizing and supplying an intake air to an engine, and upstream of a throttle body, for controlling the amount of the intake air to be supplied to an air intake port of the engine. The air intake chamber serves to accumulate the high pressure intake air discharged from the supercharger. The air intake chamber is provided with an injector, which has a fuel injecting port positioned at a location displaced from an axis of an outlet of the air intake chamber.

A control device for an internal combustion engine includes first and second intake ports (16a, 16b) independent of each other, and first and second fuel injection valves (30a, 30b) provided for the first and second intake ports (16a, 16b), respectively, in each cylinder. Under a situation where an exhaust variable valve mechanism (38) is controlled such that a first exhaust valve (32a) is opened earlier than a second exhaust valve (32b), first and second air-fuel ratios A/F1, A/F2 are respectively obtained in a first half and a second half of an exhaust stroke. When the obtained first air-fuel ratio A/F1 (or the second air-fuel ratio A/F2) is lean, a fuel injection amount in a next cycle by the first or second fuel injection valve (30a, 30b) corresponding to the first air-fuel ratio A/F1 (or the second air-fuel ratio A/F2) that is lean is reduced.

An off-road vehicle includes an internal combustion engine, a supercharger, an intercooler, an intake tank, a throttle body, first injectors, and at least one second injector. The engine includes cylinders. The supercharger supplies intake air to the engine. The intercooler is provided at an intake conduit provided between the supercharger and the engine. The intake tank is provided at the intake conduit and defines an intake chamber inside the intake tank. The throttle body is provided at the intake conduit, and includes intake conduits and throttle valves. The intake conduits are respectively connected to intake ports of the cylinders. The throttle valves are respectively provided in the intake conduits. The plurality of first injectors are provided at the throttle body and inject fuel to the respective intake conduits. The at least one second injector is provided at the intake tank and injects fuel to the intake chamber.