The Harley-Davidson Big Twin online service manual was derived from the original Harley-Davidson factory service manual. It provides service, repair and maintenance information for the 1940-1947 OHV 61 Cubic Inch (1000cc), 74 Cubic Inch (1200cc) engines, Side Valve 74 Cubic Inch (1200cc) engines and 80 Cubic Inch (1300cc) engines found in 1940-1947 Harley-Davidson motorcycles.

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The Harley-Davidson Big Twin online repair manual covers the following motorcycles:

1947 Harley-Davidson Model UL 74 SV (1214cc)
1947 Harley-Davidson Model U 74 SV (1214cc)
1947 Harley-Davidson FS Knucklehead Sidecar 74ci 1214cc
1947 Harley-Davidson FL Knucklehead Special Sport Solo 74ci 1214cc
1947 Harley-Davidson F Knucklehead Solo 74ci 1214cc
1947 Harley-Davidson ES Knucklehead Sidecar 61ci 1000cc
1947 Harley-Davidson EL Knucklehead Special Sport Solo 61ci 1000cc
1947 Harley-Davidson E Knucklehead Solo 61ci 1000cc
1946 Harley-Davidson Model UL 74 SV (1214cc)
1946 Harley-Davidson Model U 74 SV (1214cc)
1946 Harley-Davidson FS Knucklehead Sidecar 74ci 1214cc
1946 Harley-Davidson FL Knucklehead Special Sport Solo 74ci 1214cc
1946 Harley-Davidson F Knucklehead Solo 74ci 1214cc
1946 Harley-Davidson ES Knucklehead Sidecar 61ci 1000cc
1946 Harley-Davidson EL Knucklehead Special Sport Solo 61ci 1000cc
1946 Harley-Davidson E Knucklehead Solo 61ci 1000cc
1945 Harley-Davidson Model UL 74 SV (1214cc)
1945 Harley-Davidson Model U 74 SV (1214cc)
1945 Harley-Davidson FS Knucklehead Sidecar 74ci 1214cc
1945 Harley-Davidson FL Knucklehead Special Sport Solo 74ci 1214cc
1945 Harley-Davidson F Knucklehead Solo 74ci 1214cc
1945 Harley-Davidson ES Knucklehead Sidecar 61ci 1000cc
1945 Harley-Davidson EL Knucklehead Special Sport Solo 61ci 1000cc
1945 Harley-Davidson E Knucklehead Solo 61ci 1000cc
1944 Harley-Davidson Model UL 74 SV (1214cc)
1944 Harley-Davidson Model U 74 SV (1214cc)
1944 Harley-Davidson FL Knucklehead Special Sport Solo 74ci 1214cc
1944 Harley-Davidson F Knucklehead Solo 74ci 1214cc
1944 Harley-Davidson EL Knucklehead Special Sport Solo 61ci 1000cc
1944 Harley-Davidson E Knucklehead Solo 61ci 1000cc
1943 Harley-Davidson Model UL 74 SV (1214cc)
1943 Harley-Davidson Model U 74 SV (1214cc)
1943 Harley-Davidson FL Knucklehead Special Sport Solo 74ci 1214cc
1943 Harley-Davidson F Knucklehead Solo 74ci 1214cc
1943 Harley-Davidson EL Knucklehead Special Sport Solo 61ci 1000cc
1943 Harley-Davidson E Knucklehead Solo 61ci 1000cc
1942 Harley-Davidson Model UL 74 SV (1214cc)
1942 Harley-Davidson Model U 74 SV (1214cc)
1942 Harley-Davidson FL Knucklehead Special Sport Solo 74ci 1214cc
1942 Harley-Davidson F Knucklehead Solo 74ci 1214cc
1942 Harley-Davidson EL Knucklehead Special Sport Solo 61ci 1000cc
1942 Harley-Davidson E Knucklehead Solo 61ci 1000cc
1941 Harley-Davidson Model ULH 80 SV (1312cc)
1941 Harley-Davidson Model UL 74 SV (1214cc)
1941 Harley-Davidson Model UH 80 SV (1312cc)
1941 Harley-Davidson Model U 74 SV (1214cc)
1941 Harley-Davidson FS Knucklehead Sidecar 74ci 1214cc
1941 Harley-Davidson FL Knucklehead Special Sport Solo 74ci 1214cc
1941 Harley-Davidson ES Knucklehead Sidecar 61ci 1000cc
1941 Harley-Davidson EL Knucklehead Special Sport Solo 61ci 1000cc
1940 Harley-Davidson Model ULH 80 SV (1312cc)
1940 Harley-Davidson Model UL 74 SV (1214cc)
1940 Harley-Davidson Model UH 80 SV (1312cc)
1940 Harley-Davidson Model UA US Army 74 SV (1214cc)
1940 Harley-Davidson Model U 74 SV (1214cc)
1940 Harley-Davidson ES Knucklehead Sidecar 61ci 1000cc
1940 Harley-Davidson EL Knucklehead Special Sport Solo 61ci 1000cc

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TROUBLE CHART

INITIAL SERVICING OF NEW MOTORCYCLE

ENGINE LUBRICATION

ENGINE OVERHAUL

ELECTRICAL SYSTEM

SERVICING CARBURETOR

TRANSMISSION AND CLUTCH

WHEELS, HUBS AND TIRES

FORK, FRAME AND HANDLEBARS

SIDECAR

DETAILED INDEX

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