S&S Cycle Bore Big Twin Stroker Kit 1936–1999 3 7/16 - 3 1/2 - Manual (Page 6)

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C. Inspect keyways and oil holes for burrs in flywheels and remove if necessary.
D. With key in shaft, insert into respective tapered hole in flywheel and check to see that key does not bottom in groove. If key bottoms out,
file flat side of key, not rounded side, until shaft with key in place fits in flywheel without bottoming out. Check crankpin and crankpin key
also.
E. Using lacquer thinner, clean mainshaft tapers, crankpin and flywheel tapers again.
F. Assemble mainshafts in respective flywheels. Coat taper and threads of each shaft with green Loctite® during assembly. Install crankpin
in camside flywheel using Loctite also. Tighten all nuts to at least factory torque specs minimum. When S&S shafts are used, follow
instructions included with them.
NOTE:S&S® recommends to tighten nuts very tight. We use a 3⁄4" drive breaker bar and a five foot piece of pipe when assembling flywheels.
After right side flywheel, pinion shaft and crankpin are assembled, blow air through pinion shaft oil feed hole to check for blockage.
Partially or completely blocked oil feed passageways may cause irreversible damage to bearings and other engine components.
G. Measure width of female rod on crankpin end. See Picture 3, below left. Measurement should be 1.743" to 1.745".
H. Assemble left and right flywheels and moderately snug nuts. Do not worry about them being true. Measure distance between connecting
rod thrust pads. See Picture 4, below right.
NOTE: S&S recommended rod side play is .015" to .035". Rod Side Play = (Distance from Pad to Pad) - (Female Rod Width)
Incorrect connecting rod side play may cause excessive rod side thrusting and potential damage to rods, flywheels and other engine
components.
If difference is less than .020", female rod must be ground on sides as final tightening will pull wheels closer together. Rod side play diminishes
about .015" when crankpin nut is final tightened. Take equal amounts off each side if amount to be removed is more than .010". If there is
no rod side play try different crankpin. If rod side play is more than .035", try different crankpin. We have run side play of as much as .045"
without serious consequences. If crankpin is changed check rod bearing clearance. If side play is excessive and different crankpins do not correct
problem, contact us.
Picture 2
CAUTION
Picture 3 Picture 4
CAUTION