Variable valve timing system for an engine

An engine for a two-wheeled vehicle, the engine comprising:

• at least one cylinder comprising a combustion chamber and a cylinder head positioned adjacent the combustion chamber;
• a crankcase coupled to the at least one cylinder and including a crankshaft positioned within a crankshaft housing of the crankcase;
• and
• a valve train operably coupled to the crankshaft and comprising:
• at least one intake valve fluidly coupled to the combustion chamber;
• at least one exhaust valve fluidly coupled to the combustion chamber;
• at least one pushrod operably coupled to one of the at least one intake valve or the at least one exhaust valve;
• a cam chest operably coupled to the at least one pushrod;
• a cam phaser assembly operably coupled to the cam chest, wherein the cam chest and the cam phaser assembly are positioned outward of the crankcase housing and the at least one cylinder in a top view of the engine;
• and
• a phase sensor electrically coupled to the cam phaser assembly, wherein the phase sensor axially overlaps the cam chest and the cam phase assembly in the top view of the engine, and wherein the phase sensor defines an axially outermost component of the valve train.

An engine for a two-wheeled vehicle, the engine comprising:

• at least one cylinder comprising a combustion chamber and a cylinder head positioned adjacent the combustion chamber;
• a crankcase coupled to the at least one cylinder and including a crankshaft;
• and
• a valve train operably coupled to the crankshaft and comprising:
• at least one camshaft operably coupled to the crankshaft and vertically overlapping a portion of the crankshaft in an axial direction;
• a drive assembly operably coupled to the at least one camshaft;
• a timing wheel operably coupled to the drive assembly;
• and
• a cam phaser assembly operably coupled to the at least one camshaft and positioned outward of the crankcase,
• wherein the timing wheel is positioned axially intermediate the cam phaser assembly and the drive assembly.

An engine for a two-wheeled vehicle, the engine comprising:

• a crankcase including a crankshaft configured to rotate about an axis of rotation;
• a first cylinder coupled to the crankcase and having a first axis and a first piston configured to reciprocate between a first top-dead-center position and a first bottom-dead-center position, wherein the first top-dead-center position defines a first firing plane of the first piston, wherein the first axis is perpendicular to the first firing plane and extends through the axis of rotation of the crankshaft;
• a first cylinder head coupled to the first cylinder;
• a second cylinder coupled to the crankcase and having a second axis and a second piston configured to reciprocate between a second top-dead-center position and a second bottom-dead-center position, wherein the second top-dead-center position defines a second firing plane of the second piston, wherein the second axis is perpendicular to the second firing plane and extends through the axis of rotation of the crankshaft;
• a second cylinder head coupled to the second cylinder;
• and
• a valve train operably coupled to the crankshaft and comprising:
• an intake camshaft operably coupled to the crankshaft;
• a first exhaust camshaft operably coupled to the first cylinder;
• a second exhaust camshaft operably coupled to the second cylinder;
• a drive assembly operably coupled to the at least one camshaft;
• a timing wheel operably coupled to the drive assembly;
• and
• a cam phaser assembly operably coupled to the intake camshaft, wherein the intake camshaft and the cam phaser assembly are positioned within an envelope defined by the first and second firing planes and the first and second axis,
• wherein the first and second exhaust camshafts are positioned outside of the envelope,
• wherein the timing wheel is positioned axially intermediate the cam phaser assembly and the drive assembly.