Patent ID: 8607758
Filing Date: 2013-12-17
Classification: F01L,F01P,F02B,F16H

Abstract:
1. A motorcycle engine comprising: a cylinder block disposed in a vehicle to have an axis extending perpendicularly or slightly inclined forwardly; and a cylinder head and a cylinder head cover defining a joint surface therebetween, said joint surface being inclined such that the rear joint surface is higher than the front joint surface, said cylinder head including: the intake port has an outer opening having a center disposed on a level upward of a center of an outer opening of the exhaust port, an upper end of the outer opening of the intake port being disposed near the rear joint surface; a camshaft and a rocker arm disposed higher than said joint surface; the engine hanger boss provided on either side of the cylinder head, the engine hanger boss has a centerline that crosses the intake port, and is disposed upwardly of an upper end of the outer opening of the exhaust port; and the cam chain tensioner lifter and the coolant temperature sensor mounting portion are disposed at an overlapping position in a side view, downwardly of the engine hanger boss and an open end of the intake port, wherein the center of a camshaft driven sprocket is located higher than the joint surface and the camshaft driven sprocket and the joint surface are disposed in an overlapping position, in side view, and a tension lifter is attached to a tension lifter mounting portion using a tensioner lifter mounting bolt, and wherein the tensioner lifter mounting portion is disposed downwardly of the engine hanger boss on the left of the intake port outer opening at the rear portion of the cylinder head.