Caution – S&S Cycle General Flywheel User Manual

Page 4

S&S

warranty is void if flywheel tapers are lapped.

Check keys in groove of shafts. Keys should be light
hand press fit in grooves. If key is too tight in groove,
sand side key with fine sand paper on a metal plate or
other flat surface. Do not hammer key into groove.

Hammering tight key into groove may result in irreparable
damage to shaft.

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.

Lower End Assembly

Reclean mainshaft tapers, crankpin and flywheel tapers
with lacquer thinner.

Assemble mainshafts in respective flywheels. Lightly
coat taper and threads of each shaft with green
Loctite

during assembly. Install crankpin in camside

flywheel using Loctite

also. Refer to table below for

torque specifications.

If stock torque specs are exceeded with stock mainshafts
damage to the mainshaft may result. Flywheels or
connecting rod bearings damaged as a result of blocked oil
passageways that were not checked during assembly are not
covered under warranty.

After camside flywheel, pinion shaft and crankpin are
assembled, blow air through pinion shaft oil feed hole to
check for blockage or misalignment of oil feed passages.

Partially or completely blocked oil feed passageways may
cause irreversible damage to connecting rod bearings and
other engine components.

Measure width of female rod on crankpin end. See
Picture 2. Measurement should be 1.743"-1.745" for big
twins, and 1.481"-1.483" for Harley-Davidson

Sportster

models.

A pre-assembly connecting rod side play check should
be done before final assembly to determine if
connecting rod side play will fall within the specified
.015"-.035" range when crankpin nuts are final
tightened. Assemble left and right flywheels on
crankpin without rods. Moderately snug crankpin nuts.
Do not worry about flywheels being true. Measure
distance between connecting rod thrust pads on
flywheels. See Picture 3.

CAUTION

Picture 2

Picture 3

S&S

FLYWHEEL ASSEMBLY TORQUE SPECIFICATIONS

Stock Harley-

Davidson

Shafts

S&S Shafts

(Street)

S&S Shafts

(Racing)

BIG TWIN

Sprocket Shaft

290-320

400-450

450-0005

Pinion Shaft

140-170

275-300

Crankpin Nut

180-210

350-400

450-500

SPORTSTER

MODEL

Sprocket Shaft

100-120

340-360

350-400

Pinion Shaft -

Pre-1985

Sportster

Models

100-120

180-200

200-250

Pinion Shaft -

1985-Up

Sportster

Models

100-120

340-360

350-400

Crankpin Nut

150-075

290-310

350-400*

* Using S&S sprocket shaft nut on crankpin.