Page 19 - Big Twin
P. 19
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 BIG TWIN
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
Pinion Shaft Gears. Orange is largest, black is the smallest.
Size 1977-89 1993-99
OHV BT Evo Big Twin
Orange 12-9938 —
White 12-9943 —
Yellow 12-9945 —
Red 12-9940 12-1210
Blue 12-9941 —
Green 12-9942 — 12-1425 –– 43 .060 Cam Gear Washer
Black 12-9939 — 12-1426 –– 43 .065 Cam Gear Washer
12-0507 24023-54 25 1970-89 Pinion Gear Nut 12-1427 –– 43 .070 Cam Gear Washer
.075 Cam Gear Washer
43
––
12-1428
12-0613 As Above Jims 12-1429 –– 43 .080 Cam Gear Washer
12-0512 24022-90 25 1990-92 Pinion Gear Nut
12-0577 7916A 25 1993-up Pinion Gear Nut 12-1430 –– 43 .085 Cam Gear Washer 12-1438
12-1431
.090 Cam Gear Washer
43
––
10-0703 24641-36 28 1970-up Oil Pump Shaft Bush 12-1432 –– 43 .095 Cam Gear Washer
12-1539 24703-54B 29 1970-89 Pinion Gear Spacer 12-1433 –– 43 .100 Cam Gear Washer
12-9922 24704-90 29 1990-up Pinion Gear Spacer 17-0908 25550-57 44 1958-up Lock Washer, 5 pack
15-0871 25225-70B 33 1970-92 Gasket and Seal Kit
15-0872 25225-93 33 1993-up Gasket and Seal Kit 17-1281 25550-57A 45 Cam Washer, 5 pack
10-0705
1970-up Bushing
46
25581-70
12-9906 25313-77 38 1978-99 Breather Valve, S&S 10-2525 As Above 46 .005 Oversize
12-9957 –– 38 As Above .030 O.S. 10-0708 25582-73 47 1973-92 Bushing Standard
12-9909 S&S 37 Washers for Above (Set) 10-2529 As Above 47 1973-92 Bushing .005 Oversize
12-1537 25313-77 38 1978-99 Breather Gear, Sifton Steel
12-1531 25310-82 38 1982-90 1992-up Breather Valve(Plastic) 10-8536 25582-93 47 1993-up Bushing
10-8556
1993-up Bushing .005 O/S
47
As Above
12-1530 Nylon 39 1982-up .130-.165 Set, 8 pack 12-1407 26345-73 50 1973-up Drive Gear, 24T 12-1439
12-1533 25329-91 39A 1991-up Big Twin Air/Oil Separator 12-0805 26346-70 52 1970-up Gear Shaft
12-1508 25550-36 43 1970-up Cam Gear 12-0205 26348-15 53 1936-up Oil Pump Key, 10 pack
Washer Set .050-.095 (10 pieces)
10-1254 25550-84 43 1984-up .045 Thick, 5 pack 12-1392 26349-84 54 1984-89 Drive Gear
1990-92 Drive Gear
26354-90
54
12-1438
12-1440 –– 43 .050 Cam Gear Washer 12-1439 26354-93 54 1993-up Drive Gear
12-1441 –– 43 .055 Cam Gear Washer
Breather Gear
Sifton Breather A A-Big Twin Steel B 12-1531 C 12-1510
TM
Gear Kit is con- Breather Valve
structed of precision is a machined
ground steel with breather valve and
screen installed. 8 gear. Designed to
piece steel thrust replace the stock
washer set included. Fits 1978-85 BT. steel or plastic units.
VT No. 12-1540 Order 8-piece thrust washers separately. B-Stock Plastic Breather Valves.
12-1949 S&S Reed Available in stock duration only with either VT No. OEM Year
Breather features standard or +.030 oversize outside dimen- 12-1531 25310-82A L1977-99
three steel reeds sion. 12-1953 As Above .005 Oversize
that are normally VT No. Years Size Brand C-Thrust Washer Set, Breather Valve for
in the closed posi- 12-9906 1978-99 Standard S&S 1979-99 Big Twin includes one of each
tion. The down- 12-1537 1978-99 Standard Sifton size as noted.
ward cylinder 12-9957 1978-99 +.030 S&S VT No. Fits Set
motion increases 12-9909 All Washer Set S&S 12-1510 1979-82 8 Steel
crankcase pressure to open the reeds. On 12-1510 All Washer Set Sifton .110, .115, .120, .125
the upward stroke a vacuum is created. .130, .135, .140, .145
VT No. 12-1949 12-1530 1982-99 8 Plastic
.130, .135, .140, .145
12-1945 12-1945 .150, .155, .160, .165
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. Installed
VT No. 12-1945
163
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 BIG TWIN
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
Pinion Shaft Gears. Orange is largest, black is the smallest.
Size 1977-89 1993-99
OHV BT Evo Big Twin
Orange 12-9938 —
White 12-9943 —
Yellow 12-9945 —
Red 12-9940 12-1210
Blue 12-9941 —
Green 12-9942 — 12-1425 –– 43 .060 Cam Gear Washer
Black 12-9939 — 12-1426 –– 43 .065 Cam Gear Washer
12-0507 24023-54 25 1970-89 Pinion Gear Nut 12-1427 –– 43 .070 Cam Gear Washer
.075 Cam Gear Washer
43
––
12-1428
12-0613 As Above Jims 12-1429 –– 43 .080 Cam Gear Washer
12-0512 24022-90 25 1990-92 Pinion Gear Nut
12-0577 7916A 25 1993-up Pinion Gear Nut 12-1430 –– 43 .085 Cam Gear Washer 12-1438
12-1431
.090 Cam Gear Washer
43
––
10-0703 24641-36 28 1970-up Oil Pump Shaft Bush 12-1432 –– 43 .095 Cam Gear Washer
12-1539 24703-54B 29 1970-89 Pinion Gear Spacer 12-1433 –– 43 .100 Cam Gear Washer
12-9922 24704-90 29 1990-up Pinion Gear Spacer 17-0908 25550-57 44 1958-up Lock Washer, 5 pack
15-0871 25225-70B 33 1970-92 Gasket and Seal Kit
15-0872 25225-93 33 1993-up Gasket and Seal Kit 17-1281 25550-57A 45 Cam Washer, 5 pack
10-0705
1970-up Bushing
46
25581-70
12-9906 25313-77 38 1978-99 Breather Valve, S&S 10-2525 As Above 46 .005 Oversize
12-9957 –– 38 As Above .030 O.S. 10-0708 25582-73 47 1973-92 Bushing Standard
12-9909 S&S 37 Washers for Above (Set) 10-2529 As Above 47 1973-92 Bushing .005 Oversize
12-1537 25313-77 38 1978-99 Breather Gear, Sifton Steel
12-1531 25310-82 38 1982-90 1992-up Breather Valve(Plastic) 10-8536 25582-93 47 1993-up Bushing
10-8556
1993-up Bushing .005 O/S
47
As Above
12-1530 Nylon 39 1982-up .130-.165 Set, 8 pack 12-1407 26345-73 50 1973-up Drive Gear, 24T 12-1439
12-1533 25329-91 39A 1991-up Big Twin Air/Oil Separator 12-0805 26346-70 52 1970-up Gear Shaft
12-1508 25550-36 43 1970-up Cam Gear 12-0205 26348-15 53 1936-up Oil Pump Key, 10 pack
Washer Set .050-.095 (10 pieces)
10-1254 25550-84 43 1984-up .045 Thick, 5 pack 12-1392 26349-84 54 1984-89 Drive Gear
1990-92 Drive Gear
26354-90
54
12-1438
12-1440 –– 43 .050 Cam Gear Washer 12-1439 26354-93 54 1993-up Drive Gear
12-1441 –– 43 .055 Cam Gear Washer
Breather Gear
Sifton Breather A A-Big Twin Steel B 12-1531 C 12-1510
TM
Gear Kit is con- Breather Valve
structed of precision is a machined
ground steel with breather valve and
screen installed. 8 gear. Designed to
piece steel thrust replace the stock
washer set included. Fits 1978-85 BT. steel or plastic units.
VT No. 12-1540 Order 8-piece thrust washers separately. B-Stock Plastic Breather Valves.
12-1949 S&S Reed Available in stock duration only with either VT No. OEM Year
Breather features standard or +.030 oversize outside dimen- 12-1531 25310-82A L1977-99
three steel reeds sion. 12-1953 As Above .005 Oversize
that are normally VT No. Years Size Brand C-Thrust Washer Set, Breather Valve for
in the closed posi- 12-9906 1978-99 Standard S&S 1979-99 Big Twin includes one of each
tion. The down- 12-1537 1978-99 Standard Sifton size as noted.
ward cylinder 12-9957 1978-99 +.030 S&S VT No. Fits Set
motion increases 12-9909 All Washer Set S&S 12-1510 1979-82 8 Steel
crankcase pressure to open the reeds. On 12-1510 All Washer Set Sifton .110, .115, .120, .125
the upward stroke a vacuum is created. .130, .135, .140, .145
VT No. 12-1949 12-1530 1982-99 8 Plastic
.130, .135, .140, .145
12-1945 12-1945 .150, .155, .160, .165
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. Installed
VT No. 12-1945
163
