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Truett & Osborn Flywheels

Truett & Osborn Flywheels

Select variant:
63-725
fits Big Twin Flathead 1937-1948; 74"/1200cc & 80”/1300cc; Ø 8-9/32”; stroke: 4-9/32 ”; replaces OEM HD 340-37, and 341-37; NOTE: Must be assembled with 1941→ 74” OHV crank pin
63-752
fits J/F models 1915-1929; 61"/1000cc; Ø 8-3/4”; stroke: 3-1/2 ”
63-728
fits JD/FD models 1921-1929; 74"/1200cc; Ø 8-3/4”; stroke: 3-31/32 ”
63-724
fits JD/FD models 1921-1929; 74"/1200cc; Ø 8-3/4”; stroke: 4 ”
63-746
fits W, WR, WLDR and G models 1937-1973; 45”/750 cc ; Ø 7-7/8”; stroke: 3-13/16 ”; replaces OEM HD 338-32, 339-37, 23916-32, and 23936-37
63-742
fits V series models 1930-1936; 74"/1200cc; Ø 8-1/8”; stroke: 4 ”; replaces OEM HD 340-30A, and 341-30A
63-743
fits V series models 1930-1936; 80”/1300cc; Ø 8-1/8”; stroke: 4-1/4 ”
63-754
fits Knucklehead 1936-1940; 61”/1000 cc; Ø 8-1/8”; stroke: 3-1/2 ”; replaces OEM HD 338-36, and 339-36; NOTE: Must be assembled with 1941→ 74” OHV crank pin
63-729
fits Knucklehead and Panhead 1941-1954; 61”/1000 cc; Ø 8-1/2”; stroke: 3-1/2 ”; replaces OEM HD 23922-41, 23942-41, 338-41, and 339-41; NOTE: Must be assembled with 1941→ 74” OHV crank pin
63-726
fits Knucklehead and Panhead 1941-1954; 74"/1200cc ; Ø 8-1/2”; stroke: 3-31/32 ”; replaces OEM HD 338-37, 339-37, 23919-41, and 23940-41
63-727
fits Panhead and Shovelhead 1956-1969; 74"/1200cc ; Ø 8-1/2”; stroke: 3-31/32 ”; replaces OEM HD 23940-41, 23919-56, and 23919-65
63-757
fits Shovelhead 1972-1981; 74"/1200cc ; Ø 8-1/2”; stroke: 3-31/32 ”; replaces OEM HD 23919-72, and 23940-41A; NOTE: Must be assembled with 1982→ sprocket shaft. Can be used →1984 with → early 1981 crank pin.
63-755
fits Shovelhead 1972-1981; 80”/1340 cc; Ø 8-1/2”; stroke: 4-1/4 ”; replaces OEM HD 23922-78, and 23924-78; NOTE: Must be assembled with 1982→ sprocket shaft. Can be used →1984 with → early 1981 crank pin.
63-756
fits Evolution Big Twins 1985-1999 ; 80”/1340 cc; Ø 8-1/2”; stroke: 4-1/4 ”
Price and stock:
Item №
63-725
Price incl. VAT
1,131.81 €
Available
3
Ready for immediate delivery from our Würzburg, Germany warehouse
The price includes 180.71 € German VAT.
set
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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 and 45”), with the same weight and resulting 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.

  • Flywheels by Truett & Osborn
  • fits Big Twin Flathead 1937-1948
  • 74"/1200cc & 80”/1300cc
  • steel
  • Ø 8-9/32”
  • stroke: 4-9/32 ”
  • replaces Harley-Davidson part number HD 340-37, and 341-37
  • USA
  • NOTE: Must be assembled with 1941→ 74” OHV crank pin
  • gross weight: 13.5 kg

See also:

Have any questions?

Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com