163
BIG TWIN
1984-99 Big Twin Pinion Hardware
1984-99 Big Twin Pinion Hardware
VT No.
OEM
#
Year/Item
12-1184
275
1
1970-up Bushing Pin
12-1153
358
2
1970-up Dowel Pin
8761-7
Kit
4
1970-92 Chrome Allen Screw Set
9305-7
Kit
4
1970-92 Stock Chrome Screws
9306-7
Kit
4
1970-92 Stock Cadmium Screws
9633-50
6099
14
1970-up Washer, Chrome
12-0316
9058
18
1970-up Needle Bearing
37-8971
10046
19
1981-up Wire Clamp
12-0901
11002
20
1970-up Oil Pump Retainer Ring
12-0202
23985-54
23
1970-up Key, Gear Shaft
Note:
24/26 See Chart for Pinion Gear Listing
12-0507
24023-54
25
1970-89 Pinion Gear Nut
12-0613
As Above
Jims
12-0512
24022-90
25
1990-92 Pinion Gear Nut
12-0577
7916A
25
1993-up Pinion Gear Nut
10-0703
24641-36
28
1970-up Oil Pump Shaft Bush
12-1539
24703-54B
29
1970-89 Pinion Gear Spacer
12-9922
24704-90
29
1990-up Pinion Gear Spacer
15-0871
25225-70B
33
1970-92 Gasket and Seal Kit
15-0872
25225-93
33
1993-up Gasket and Seal Kit
12-9906
25313-77
38
1978-99 Breather Valve, S&S
12-9957
––
38
As Above .030 O.S.
12-9909
S&S
37
Washers for Above (Set)
12-1537
25313-77
38
1978-99 Breather Gear, Sifton Steel
12-1531
25310-82
38
1982-90 1992-up Breather Valve(Plastic)
12-1530
Nylon
39
1982-up .130-.165 Set, 8 pack
12-1533
25329-91
39A 1991-up Big Twin Air/Oil Separator
12-1508
25550-36
43
1970-up Cam Gear
Washer Set
.050-.095 (10 pieces)
10-1254
25550-84
43
1984-up .045 Thick, 5 pack
12-1440
––
43
.050 Cam Gear Washer
12-1441
––
43
.055 Cam Gear Washer
12-1425
––
43
.060 Cam Gear Washer
12-1426
––
43
.065 Cam Gear Washer
12-1427
––
43
.070 Cam Gear Washer
12-1428
––
43
.075 Cam Gear Washer
12-1429
––
43
.080 Cam Gear Washer
12-1430
––
43
.085 Cam Gear Washer
12-1431
––
43
.090 Cam Gear Washer
12-1432
––
43
.095 Cam Gear Washer
12-1433
––
43
.100 Cam Gear Washer
17-0908
25550-57
44
1958-up Lock Washer, 5 pack
17-1281
25550-57A
45 Cam Washer, 5 pack
10-0705
25581-70
46
1970-up Bushing
10-2525
As Above
46
.005 Oversize
10-0708
25582-73
47
1973-92 Bushing Standard
10-2529
As Above
47
1973-92 Bushing .005 Oversize
10-8536
25582-93
47
1993-up Bushing
10-8556
As Above
47
1993-up Bushing .005 O/S
12-1407
26345-73
50
1973-up Drive Gear, 24T
12-0805
26346-70
52
1970-up Gear Shaft
12-0205
26348-15
53
1936-up Oil Pump Key, 10 pack
12-1392
26349-84
54
1984-89 Drive Gear
12-1438
26354-90
54
1990-92 Drive Gear
12-1439
26354-93
54
1993-up Drive Gear
12-1438
12-1439
Breather Gear
B 12-1531
B-Stock Plastic Breather Valves.
VT No. OEM
Year
12-1531 25310-82A L1977-99
12-1953 As Above .005 Oversize
C-Thrust Washer Set, Breather Valve for
1979-99 Big Twin includes one of each
size as noted.
VT No. Fits
Set
12-1510 1979-82
8 Steel
.110, .115, .120, .125
.130, .135, .140, .145
12-1530 1982-99
8 Plastic
.130, .135, .140, .145
.150, .155, .160, .165
C 12-1510
A-Big Twin Steel
Breather Valve
is a machined
breather valve and
gear. Designed to
replace the stock
steel or plastic units.
Order 8-piece thrust washers separately.
Available in stock duration only with either
standard or +.030 oversize outside dimen-
sion.
VT No. Years
Size
Brand
12-9906 1978-99 Standard S&S
12-1537 1978-99 Standard Sifton
12-9957 1978-99 +.030
S&S
12-9909 All
Washer Set S&S
12-1510 All
Washer Set Sifton
A
Sifton
TM
Breather
Gear Kit is con-
structed of precision
ground steel with
screen installed. 8
piece steel thrust
washer set included. Fits 1978-85 BT.
VT No. 12-1540
S&S Reed
Breather features
three steel reeds
that are normally
in the closed posi-
tion. The down-
ward cylinder
motion increases
crankcase pressure to open the reeds. On
the upward stroke a vacuum is created.
VT No. 12-1949
12-1949
12-1945
Installed
12-1945
Sifton Air Ramp fits S&S/Sifton
Breather Gear on 1936-99 models to
remove more air and oil from crankcase.
Requires removal of screen for installa-
tion. Gear not included.
VT No. 12-1945
Pinion Shaft Gears. Orange is largest, black is the smallest.
Size
1977-89
OHV BT
1993-99
Evo Big Twin
Orange
12-9938
—
White
12-9943
—
Yellow
12-9945
—
Red
12-9940
12-1210
Blue
12-9941
—
Green
12-9942
—
Black
12-9939
—