I realize this is probably off-topic, but I post this for the "engine guys" on this forum. I recently rebuilt a totally worn-out Cushman scooter engine for a friend and posted the ordeal on SmokStak. Here is the link:
https://www.smokstak.com/forum/threads/cushman-scooter-engine-rebuild.191619/
It was interesting in that it was the first Cushman engine I've ever worked on. Comparing this design to the venerable Kohler K-series, the Kohler is a much more robust engine in most all respects. The few things I liked about the Cushman was the forged steel con-rod and the novel, plunger-type oil pump with centrifugal slinger on the crankshaft. The Kohler excels in larger crankpin and main bearing journals, larger camshaft diameters including cams, long and well-supported valve stems and guides, and heavy duty ball main bearings (versus the Timken tapered roller bearings that are a pain to get shimmed correctly).
The Cushman engine turned out well and runs very nicely. The scooter was restored by a professional outfit that did a beautiful job. I hope to get a chance to ride this beautiful machine soon.
https://www.smokstak.com/forum/threads/cushman-scooter-engine-rebuild.191619/
It was interesting in that it was the first Cushman engine I've ever worked on. Comparing this design to the venerable Kohler K-series, the Kohler is a much more robust engine in most all respects. The few things I liked about the Cushman was the forged steel con-rod and the novel, plunger-type oil pump with centrifugal slinger on the crankshaft. The Kohler excels in larger crankpin and main bearing journals, larger camshaft diameters including cams, long and well-supported valve stems and guides, and heavy duty ball main bearings (versus the Timken tapered roller bearings that are a pain to get shimmed correctly).
The Cushman engine turned out well and runs very nicely. The scooter was restored by a professional outfit that did a beautiful job. I hope to get a chance to ride this beautiful machine soon.
