1980 Johnson 2HP Service Manual, Page 10Get this manual
CLEARANCE CHART
316021 TEST WHEEL
Powerh ead +standard size 1.56751.5668 minPiston ring gap 0.025 0.01 (0.64 0.38 Piston ring groove 0.0040 0.0020 (0.102 0.51 Cylinder nd piston ,0.0055 0.0043 min(0.140 0.109 Lower unit Dri veshaft nd bushing in gear case 0.0028 0.0010 min(0.071 0.025 Gearcase head nd propeller sh aft 0.0022 0.0007 min(0.056 0.018 Propeller shaft 0.0057 0.0022 min(0 .145 0.056 Gearcase bushing to propeller 0.0007 min(0.056 0.018 sh aft 0.0022 determine correct size for oversiz piston, merely add oversize dimension to standard siz := ;;;
FOR 1116"