Twin cylinder motorcycle engine
A rocker box, pushrod assembly, oil delivery system, tappets and tappet guides are provided for an engine, particularly a shovelhead motorcycle engine. The rocker box includes a separable upper portion and lower portion with a seal for sealing the upper portion and lower portion when coupled together. The pushrod assembly includes an adjusting unit that collapses into a pushrod shaft. The oil delivery system includes an oil passageway(s) in a rocker shaft of a rocker arm assembly, and at least one of an oil passageway(s) in a rocker box and an oil passageway(s) in a pushrod assembly.
1 .- 45 . (canceled)
46 . A tappet guide assembly for a motorcycle engine, comprising:
a shovelhead style tappet block including:
at least one pushrod counterbore for receiving a corresponding pushrod cover; and
at least one tappet bore for receiving a corresponding evolution style tappet; and
the evolution style tappet positioned within each tappet bore for actuating a corresponding pushrod assembly.
47 . The tappet guide assembly of claim 46 , further comprising at least one 0-ring for sealing the shovelhead style tappet block with the pushrod cover(s).
48 . The tappet guide assembly of claim 46 , further comprising at least one gasket for sealing the shovelhead style tappet block with a mounting surface on a crankcase.
49 . A shovelhead motorcycle engine including the tappet guide assembly of claim 46 .
50 . A motorcycle including the shovelhead motorcycle engine of claim 49.