1 is a sectional view of a combustion chamber of a four-stroke cycle engine shown in FIG. 4; FIG. 2 is a view showing the combustion chamber of 5 FIG.

7 size and weight of the four-stroke-cycle engine, thus obtaining a four-stroke- cycle engine suitable for mounting on a portable work machine which requires ...

For this prior art four stroke cycle engine 10, four strokes of each piston 16, ie inlet, compression, expansion and exhaust, and two revolutions of the ...

A four stroke internal combustion engine, comprising: a crankcase; a cylinder head connected to the crankcase, wherein the cylinder head and the crankcase ...

The four stroke internal combustion engine according to claim 1, wherein the open loop cooling system includes an exhaust gas cooling assembly for cooling ...

A four stroke internal combustion engine as set forth in claim 1 wherein said respective driven wheels have generally the same diameter. 3.

1 SPLIT FOUR STROKE ENGINE CROSS REFERENCE TO RELATED APPLICATIONS This patent application is a continuation in part application of US application Ser. No.

More particularly, the invention relates to an improved, lightweight four-stroke internal combustion engine having a favorable power to weight ratio and ...