Description
Reviews (0)

Truett & Osborn Flywheels

Part numbers for Truett & Osborn Flywheels are determined by combining the model code and the desired stroke length. This chart lists replacement flywheels (stock cubic inch displacement) by year and model. See stroke availability chart below for additional stroke lengths. Big Twin flywheels from 1939-1999 are available in two different styles (TorqueMonster Weight & Lighter Weight). The TorqueMonster flywheels are direct replacement weight (heavy) for years 1930-1981. The left side flywheel is much wider and heavier than the right side. The Lighter weight flywheels are the same width and weight for both right and left sides (similar to Evolution flywheels and S&S). Late Shovelheads and Evolutions from 1982-1999 the Lighter weight would be the direct replacement weight. TorqueMonster weight is available for these models as an option to increase low-end torque in Evos.

YEAR/MODEL FITMENT		SPECIFICATIONS			MODEL CODES
Years	Engine Size/Model	Stock Stroke	Outside Diameter	Notes	TorqueMonster Weight	Lighter Weight
1929-1973	Harley 45”	3 13/16	7 7/8			HD45
1929-1973	Special HD 45"	3 13/16	7 7/8	Uses XL C-pin/Rods	*	HD45XL

1952-1953	K-model	3 13/16	7 7/8	Press in shafts&C-pin	*	52K
1954-1956	KH-model	4 9/16	7 7/8	Lip on sprocket hole	*	54KH

1958-1970	XLR-model	3 13/16	7 7/8		*	XLR
1957-E1981	Sportster	3 13/16	7 7/8			EXL
L1981-1985	Sportster	3 13/16	7 7/8			LXL
1986-2003	Sportster*	3 13/16	7 7/8	S&S special shafts*	*	EVXL

1915-1920	61” J model	3 1/2	8 3/4		*	J
1921-1929	74” JD model	3 31/32	8 3/4		*	JD

1930-1936	74” Flathead	3 31/32	8 1/8	4" stroke also avail.	30T
1936	80" Flathead	4 1/4	8 1/8		30T
1937-1948	74”/80”Flathead*	4 9/32	8 9/32	Use 1941-later C-pin*	37T

1936-1940	61” Knucklehead*	3 ½	8 1/8	Use 1941-later C-pin*	36T
1941-1947	61” Knucklehead	3 ½	8 ½		39T
1948-1952	61” Panhead	3 ½	8 ½		39T

1941-1954	74” Pan/Knuckle	3 31/32	8 ½		39T	39
1955	74" Panhead	3 31/32	8 ½	56-64 Sprocket Shaft	56T	56
1956-1969	74” Pan/Shovel	3 31/32	8 ½		56T	56
1970-1971	74” Shovelhead	3 31/32	8 ½		70T	56
1972-1981	74” Shovelhead*	3 31/32	8 ½	82-up Sprocket Shaft*	82/72T	82/72
1972-1981	80” Shovelhead*	4 ¼	8 ½	82-up Sprocket Shaft*	82/72T	82/72
1982-1984	80” Shovelhead	4 ¼	8 ½		82T	82
1985-1999	80” Evolution	4 ¼	8 ½		82T	82

Flywheels for 74" & 80" OHV models are available in Lighter Weight or Torquemonster version.
Flywheels for 61" OHV & Big Twin Flathead models are only available in Torquemonster version.*see note*
Flywheels for 45" Flathead, K-model, Sportster, and JD models only available in stock Weight.

STROKE AVAILABILITY CHART

* = Available at extra charge for reducing outside diameter *see note* x = Available

Harley Davidson Flywheels

Model Code & Stroke
3 1/2" 3-13/16" 3-31/32" 4" 4-1/4" 4-5/16" 4 9/32" 4-7/16" 4 9/16" 4-1/2" 4-5/8" 4-3/4" 5"

HD45 x x x x

45XL (XL C-pin) x x x x

52K x

54KH x

XLR (Race XL) x

EXL & LXL x x x x x x

EVXL x x

J & JD Model x x x x x x

30T (flathead) x x x

37T (flathead) * * x * * * *

36T (OHV) x * * * * * *

39 & 39T x x x x x x x

56 & 56T x x x x x x

70T x

82/72 & 82/72T x x x x x x

82 & 82T x x x x x

Flywheels for 74" & 80" OHV models are available in Lighter Weight or Torquemonster version.
Flywheels for 61" OHV & Big Twin Flathead models are only available in Torquemonster version.*see note*
Flywheels for 45" Flathead, K-model, Sportster, and JD models only available in stock Weight.

*Please Note*JD ,45XL, XLR, EVXL, K, and KH flywheels are specialty flywheels, priced the same as Torquemonster Flywheels. HD45 flywheels & Sportster flywheels are priced the same as Lighter Weight Flywheels.

*Please Note*1972-1981 Original Harley flywheels used sprocket shaft part # 24001-72. This shaft was very large taper, set at 8 degrees, and had a lot of problems with slippage in the flywheel. We make our flywheels for these years to use the 1982-later 23909-80 shaft.

*Please Note*Flywheels for 1937-1948 Big Twin Flathead and 1936-1940 61" Knucklhead are made with the 1941-later OHV crankpin, NOT the stepped crankpin as original. I only make the stock stroke flywheels (4-9/32 & 3-1/2) in the TorqueMonster version, but since we make them with the later crankpin, the only difference between these and 1939-later OHV flywheels is the outside diameter. We can take a set of 1939-later OHV Lighter Weight or TorqueMonster flywheels that are available in other strokes and turn the O.D. to be used in Flathead or 61" Knuckle engines.

*Please Note*Flywheels for Evolution Sportster models require the use of special "big taper" S&S brand sprocket shaft and pinion shaft. Other parts such as pinion gears and bearings must also be changed, depending on the year/model.

Write a review

Your Name

Your Review

Note: HTML is not translated!

Rating Bad Good

Tags: Truett & Osborn, Harley Davidson, Engine Components, Flywheel

AMERICA'S LARGEST AFTERMARKET HARLEY-DAVIDSON

V-TWIN & INDIAN MOTORCYCLE PARTS STORE!