Cushman Tune-up & Engine Specs

Cushman Tune-up & Engine Specs


18hp & 22hp OMC Engines

Point Gap: .020”

Plug Gap: .025”

Valve Lash, Intake Cold: .003”-.004”

Valve Lash, Exhaust Cold: .003”-.004”

Bore, Standard: 3.500” (88.90mm)

Bore, .020” (.51mm) Over: 3.5200”-3.5210” (89.40mm-89.43mm)

Bore, .030” (.76mm) Over: 3.5300”-3.5310” (89.66mm-89.69mm)

Piston Clearance: .000”-.002” measured at bottom of skirt 90 degrees to pin

Ring End Gap, Compression: .010”-.020” (.25mm-.51mm)

Ring End Gap, Oil: .015”-.045” (.38mm-.1.14mm)



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