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457
Breather Gears
Breather Parts
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 STD or +.030 O/S outside dimension.
VT No. Years
Size
Brand
12-9967 1936-47
STD
S&S
12-9968 1936-47
+.030
S&S
12-9907* 1948-77
STD
S&S
12-1536** 1948-77
STD
Sifton
12-9956* 1948-77
+.030
S&S
12-9906 1978-99
STD S&S
12-1537 1978-99
STD Sifton
12-9957 1978-99
+.030 S&S
12-9909 All
Washer Set S&S
12-9978 All
Washer Set Sifton
12-9909 All
Washer Set S&S
12-9978 All
Washer Set Sifton
*Note: Must be used with 1954-77 Pinion & Cam Gears.
**Note: Must be used with late 1979-82 type
thrustwashers only.
Thrust Washer Set, Breather Valve for 1950-78 BT. 4 steel, one
of each: 110, .115, .120, .125
VT No. 12-1509
Primary Breather Tubes for Big Twin models.
VT No. # OEM
Years
Item
12-1514 A 24912-48 1948-57
Tube
12-1448 A 29411-36 1936-47
Tube
12-1528 B 24918-64 1936-57
Snoot
12-9908* C Kit
1958-64
All
12-1513 D 24918-58 1958-64
Rubber Nipple
40-0547 E 24912-65 1965-66
Tube with Nut
40-0548 F 24913-67 1967
Tube with Nut
24914-58 1958-64
Stud Only
*Note: Includes 24925-58 spacer, 24914-58 stud, 24922-58
collar, 24923-58 cap and 24918-58 rubber ripple.
Breather Screens and Separator in
five packs fits 1936-69 BT.
VT No. OEM
Item
12-1517 25275-36 Screen
12-1518 25279-36 Separator
Sifton
T M
1948-77 Breather
Gear Kit is constructed of
precision ground steel with
screen installed. 8 piece
steel thrustwasher set
included.
VT No. 12-1538
A
A
B 12-1531
B 12-1534
C 12-1509
B-Stock Plastic Breather Valves.
VT No. OEM
Year
12-1534 25310-71A 1970-E77
12-1531 25310-82A L1977-99
C-Thrust Washer Set, Breather
Valve for 1950-99 BT includes one
of each size 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
Big Twin Pinion Parts. Kit is complete with proper parts.
VT No. Fits
Kit
12-0101 1936-53
5 pc. Kit
12-0102 1955-69
4 pc. Kit
Pinion Shaft Seal Ring is used on all 1940-53 OHV Big Twins,
sold each. Replaces 24697-40.
VT No. 12-1525
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
installation. Gear not included.
VT No. 12-1945
Installed
Chrome Oil Pump
Covers mount onto
the existing bolts on
Big Twin models
VT No. Years
42-0041 1970-84
w/chain oiler fitting
42-0011 1980-91