Abstract: A steering stem assembly for rotatably coupling a steering assembly to a steering head of a motorcycle main frame. The steering stem assembly includes a first stem member configured to support a first end of the steering assembly on a first end of the steering head and a second stem member configured to support a second end of the steering assembly on a second end of the steering head. The second stem member is formed separately from the first stem member. A joint is defined between the first and second stem members and fixedly secures the first stem member with the second stem member.

Abstract: A steering stem assembly for rotatably coupling a steering assembly to a steering head of a motorcycle main frame. The steering stem assembly includes a first stem member configured to support a first end of the steering assembly on a first end of the steering head and a second stem member configured to support a second end of the steering assembly on a second end of the steering head. The second stem member is formed separately from the first stem member. A joint is defined between the first and second stem members and fixedly secures the first stem member with the second stem member.

Abstract: A vented, unitary sealing grommet for establishing a first liquid-tight interface between a ignition coil and a spark plug adapter tube and a second liquid-tight interface between the ignition coil and a valve cover includes a hollow main body portion having a substantially cylindrical shape with a longitudinal axis and including a pair of annular sealing ribs, a planar flange portion which is disposed within a geometric plane which is substantially perpendicular to the longitudinal axis, the main body portion being designed to fit between the ignition coil and the spark plug adapter tube such that the annular sealing ribs are compressed due to the interference fit. The planar flange portion is designed to fit between ignition coil and the valve cover.

Abstract: An improved sealing boot for a spark plug assembly is provided which includes a sealing and venting feature capable of preventing pressurized contaminants from reaching the spark plug by effectively sealing the spark plug mounting bore while permitting pressurized gas accumulating in the plug well to be vented to the engine overhead. The sealing and venting feature includes at least one annular sealing rib formed on the outer surface of the boot. The radial length and width of the sealing rib, and the resiliency of the material forming the rib, are selected to cause the rib to deflected outwardly an optimal degree, when the assembly is positioned in the bore, and to engage the bore wall with a sealing force so as to permit the desired sealing and venting. The optimal deflection causes the creation of an additional sealing force due to the pressure of fluid against the deflected portion of the rib thereby ensuring sealing.