Abstract: In a housing structure for a lawn mower, a rear scroll guide member is provided adjacent and along the width of an entrance of a cut-grass discharge passage, and this rear scroll guide member has upper and lower flanges together defining a channel-shaped concave portion for insertion and retention therein of a front end portion of a bottom plate that closes the bottom of the cut-grass discharge passage. Back plate is provided adjacent and along the width of an exit of the cut-grass discharge passage, and this back plate has a locking hole. The bottom plate has, on its rear end portion, a projection for fitting engagement with the locking hole of the back plate. Thus, the bottom plate is secured to the body of the housing with the front end portion inserted in the concave portion of the rear scroll guide member and the projection on the rear end portion fitted in the locking hole of the back plate.

Abstract: A fuel supply control system for an internal combustion engine. A load condition sensor detects a load condition of the engine, and an ECU increases the amount of fuel to be supplied to the engine when a predetermined high load condition of the engine is detected by the load condition sensor, and sets a delay time period from detection of the predetermined high load condition of the engine by the load condition sensor to execution of increase of the amount of fuel, according to operating conditions of the engine. A time period elapsed from the detection of the predetermined high load condition is counted. The set delay time period is corrected based on a ratio of the set delay time period to the counted time period and the load condition of the engine detected by the load condition sensor before the detection of said predetermined high load condition.