Home Shop Engine Lower End Flywheel Assemblies Truett & Osborn Flywheels
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Truett & Osborn Flywheels

Worn flywheels are a major obstacle during the rebuild of an engine, mostly with big expenses required to put them back into service. In such a case it is often more economic and safer to go for a new set. The Truett & Osborn flywheels offered here are manufactured from 80-55-06 ductile iron blanks, which are then heat treated. The 80,000 pound tensile strength blanks undergo an exacting 20-step manufacturing process, utilizing both CNC and conventional precision milling and machining. This insures accurate surfaces, legendary reliability, and excellent „truability“, an absolute necessity when setting up high performance motors to blueprint specifications.

They are made just like the stock counterparts, i.e. the left wheel is thicker than the right one (exc. JD), with the same weight and resulting torque.

An exception are the flywheels for Evolution Big Twins. They come as Torque Monster flywheels, i.e. unlike stock they feature a thicker left wheel for more lower end torque.

All versions are unbalanced and require adaption to the respective lower end components. All T&O flywheels feature pre-installed and replaceable connecting rod thrust washers, providing increased service-life and restorability.

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Flywheels by Truett & Osborn, steel, USA
W&W# Picture Price incl. VAT* Available from warehouse Germany?
63-752 Truett & Osborn Flywheels fits J/F models 1915-1929, 61"/1000cc, Ø 8-3/4”, stroke: 3-1/2 ” 741.07 € set
in stock
63-728 Truett & Osborn Flywheels fits JD/FD models 1921-1929, 74"/1200cc, Ø 8-3/4”, stroke: 3-31/32 ” 741.07 € set
in stock
63-724 Truett & Osborn Flywheels fits JD/FD models 1921-1929, 74"/1200cc, Ø 8-3/4”, stroke: 4 ” 741.07 € set
in stock
63-725 Truett & Osborn Flywheels fits Big Twin Flathead 1937-1948, 74"/1200cc & 80”/1300cc, Ø 8-9/32”, stroke: 4-9/32 ”, replaces OEM 340-37, and 341-37, NOTE: Must be assembled with 1941→ OHV crank pin 741.07 € set
in stock
63-754 Truett & Osborn Flywheels fits Knucklehead 1936-1940, 61”/1000 cc, Ø 8-1/8”, stroke: 3-1/2 ”, replaces OEM 338-36, and 339-36, NOTE: Must be assembled with 1941→ OHV crank pin 741.07 € set
in stock
63-726 Truett & Osborn Flywheels fits Knucklehead and Panhead 1941-1954, 74"/1200cc , Ø 8-1/2”, stroke: 3-31/32 ”, replaces OEM 338-37, and 339-37 741.07 € set
in stock
63-727 Truett & Osborn Flywheels fits Panhead and Shovelhead 1956-1969, 74"/1200cc , Ø 8-1/2”, stroke: 3-31/32 ”, replaces OEM 23940-41, 23919-56, and 23919-65 741.07 € set
in stock
63-757 Truett & Osborn Flywheels fits Shovelhead 1972-1981, 74"/1200cc , Ø 8-1/2”, stroke: 3-31/32 ”, replaces OEM 23919-72, and 23940-41A, NOTE: Must be assembled with 1982→ sprocket shaft. Can be used →1984 with → early 1981 crank pin. 741.07 € set
in stock
63-755 Truett & Osborn Flywheels fits Shovelhead 1972-1981, 80”/1340 cc, Ø 8-1/2”, stroke: 4-1/4 ”, replaces OEM 23922-78, and 23924-78, NOTE: Must be assembled with 1982→ sprocket shaft. Can be used →1984 with → early 1981 crank pin. 741.07 € set
in stock
63-756 Truett & Osborn Flywheels fits Evolution Big Twins 1985-1999 , 80”/1340 cc, Ø 8-1/2”, stroke: 4-1/4 ” 741.07 € set
in stock
* The price includes German VAT (19% or reduced rate of 7% for Books).

See also:

  • Cannonball Knucklehead Crankcases

    Cannonball Knucklehead Crankcases Reproduction crankcases which meet or exceed highest restoration demands. Cast from state-of-the-art materials and machined on CNC equipment for strength and ...

  • Cannonball Panhead Crankcases

    Cannonball Panhead Crankcases Reproduction crankcases which meet or exceed highest restoration demands. Cast from state-of-the-art materials and machined on CNC equipment for strength and ...

  • Cannonball Big Twin Flathead Crankcases

    Cannonball Big Twin Flathead Crankcases Reproduction crankcases which meet or exceed highest restoration demands. Cast from state-of-the-art materials and machined on CNC equipment for strength and ...

  • Jims Crankshaft Truing Tools

    Jims Crankshaft Truing Tools Use this professional tool to fine tune flywheel assemblies when truing. The tool comprises both a flywheel expander, and a contractor in one easy to use ...

  • IC Flywheel Assembly Jigs

    IC Flywheel Assembly Jigs Top-quality Harley flywheel rebuilding jig. The heavy-duty baseplate can be fixed in a vise and holds the flywheels with two studs for loosening or tightening ...

  • Jims Flywheel Sockets

    Jims Flywheel Sockets These sockets are machined of heat treated tool steel. With a low profile, all sockets are just long enough to give 100% nut to socket and 100% drive end ...

Have any questions?

  • Our sales team will be glad to help out:
    Mondays - Fridays 08:00-18:00 CET, Saturdays 09:00-13:00 CET
    Phone: +49 / 931 250 61 16
    eMail: sales@wwag.com