S&S Cycle Balancing Kit - Manual (Page 4)

Owner’s name: John Doe 1234 Viola Street, La Crosse, WI
Front Piston Weight
Piston 400
Wristpin 100
Clips 5
Rings 40
Wristpin 100
Total 545
Rear Piston Weight
Piston 395
Wristpin 100
Clips 5
Rings 40
Wristpin 100
Total 540
Total
of Both 1085
Reciprocating Weight
Total of Both Pistons
1085
WP End of Front Rod 209
WP End of Rear Rod 204
Total Reciprocating Weight 1498
Rotating Weight
Total of Crankpin, Nuts, etc.
700
Front Rod
CP End of Front Rod 381
CP End of Rear Rod 481
Total Rotating Weigth 1562
Total Reciprocating Weight 1498
Multiply Times balance Factor .60
Reciprocating Weight 898.8
Add Total Rotating Weight 1562.0
Total Bobweight for 2 wheels 2460.8
Divide by 2 2
Total Weight of Bobweight
to be used on Each Flywheel 1230.4
Connecting Rods
Crankpin 550
Nuts 80
Cages 30
Bearings 40
Nut Locks
& Screws not used
Total 700
Front Rod
WP End 209
CP End 381
Total 590
Act. Wt. 590
Rear Rod
WP End 204
CP End 481
Total 685
Act. Wt. 685
Date:
04-15-10
Big Twin
Sportster®
Year of Engine
1987
Bore
3 1/2" +.005
Stroke
4 5/8"
Rod Type
S&S 7100
Cage Type
Alloy
X
Notes:
Front Rod Rear Rod WP WP CP CP
wp
=
208
g
CP
=
379
g
587
g
wp
=
205
g
CP
=
483
g
688
g
590
-
587
3
208
+
1
209
205
-
1
204
379
+
2
381
483
-
2
481
Figure 2
Picture 1 Picture 2