Abstract: An any-gear-start horizontal engine for a motorcycle, including a crankshaft having a drive gear, a main shaft having a clutch platen, a clutch driven plate and a clutch housing, a clutch driven gear is mounted on the clutch housing, the clutch driven gear engaging with the drive gear, and a starting shaft extending into a right crankcase through a right crankcase cover. An idle gear rotates freely on right end of a countershaft, the idle gear, and engages with a starting gear which rotates freely on the starting shaft. The main shaft has a spline rotating freely thereon, the spline connects the clutch housing through a spline slot, and the spline engages with the idle gear. This type of engine can be restarted after being shut off without having to shift back to neutral, so it is more effort saving and convenient.

Abstract: The invention provides an any-gear-start horizontal engine for motorcycle, comprising a crank shaft (2) having a drive gear (1), a main shaft (6) having a clutch platen (12), a clutch driven plate (11) and a clutch housing (4), a clutch driven gear (3) is mounted on the clutch housing (4), the clutch driven gear (3) engages with the drive gear (1), a starting shaft (15) extends into a right crank case (19) through a right crank case cover (20), characterized in that: an idle gear (10) rotates freely on right end of a countershaft (13), the idle gear (10) engages with a starting gear (16) which rotates freely on the starting shaft (15), the main shaft (6) has a spline (5) rotating freely thereon, the spline (5) connects the clutch housing (4) through a spline slot, and the spline (5) engages with the idle gear (10). This type of engine can be restarted after being shut off without backing to neutral, so it is more effort saving and convenient.