Jackshaft, Gear Ratio, and Speed Calculators
The Fairbanks-Morse and Comet need a dual sprocket clutch like this one from OldMiniBikes on the engine.
The Fairbanks-Morse uses a standard clutch on the jackshaft.
The Comet requires a hard-to-find jackshaft clutch that fixes the bell to the shaft, and floats the clutch shoes on a bearing.
You can easily experiment with gear ratios, tire sizes, and RPM's to see what various speeds would be happening.
If you have Excel, download these spreadsheets, put in your numbers, and experiment freely:
No Jackshaft
2-Speed Jackshaft
Plain Jackshaft
No Excel? Don't "get" spreadsheets? Easily use them online, no software needed:
No Jackshaft
2-Speed Jackshaft
Plain Jackshaft
Jon
The Fairbanks-Morse and Comet need a dual sprocket clutch like this one from OldMiniBikes on the engine.
The Fairbanks-Morse uses a standard clutch on the jackshaft.
The Comet requires a hard-to-find jackshaft clutch that fixes the bell to the shaft, and floats the clutch shoes on a bearing.
You can easily experiment with gear ratios, tire sizes, and RPM's to see what various speeds would be happening.
If you have Excel, download these spreadsheets, put in your numbers, and experiment freely:
No Jackshaft
2-Speed Jackshaft
Plain Jackshaft
No Excel? Don't "get" spreadsheets? Easily use them online, no software needed:
No Jackshaft
2-Speed Jackshaft
Plain Jackshaft
Jon