This is a brand-new quality product made in America by the famous “Truett & Osborn” company for late 1981 on Harley-Davidson alternator (“cone”) big twin motors with late (commonized) 6° tapered shafts and crankpin, for street or racing use. The left flywheel is machined for the keyway used in 1986-88 engines, and will accept both the original 1981-85 non-keyed sprocket shaft, the original 1986-88 keyed sprocket shaft, as well as any aftermarket direct replacement shaft.

    It may also be used in the earlier 1972-81 (pre-commonized) 74” (1200) & 82” (1340) engines with the correct (late) shafts and minor small parts, and we strongly suggest these later parts be used in preference to the original tapers. Click for a larger view.
    Looking for other stroker flywheels? Click here: .
    The flywheels are lighter than stock, which helps throttle response and acceleration.
    These flywheels can also be ordered in the famous “

” heavyweight variety with about 4 lbs. more weight at $55.00 extra cost. In absolute terms, acceleration will be slower with heavier flywheels, most noticeable in 1st gear. Desite the name, they do not produce extra torque, they store extra torque. However, they do make starting and riding at low speeds easier, improve idle quality, and require less concentration for clutch operation, especially with large engine and transmission sprockets and heavy bikes. Read more about inertia here: .     The flywheels are 4¼” (4.250”), which is the stock 1978-* stroke for the original factory 1978-83 80” shovelhead and 1983-* Evo engines. It can also be used to stroke earlier 1972-77 74” shovelhead engines to 78.9”; see details below.

    To identify your 1981 or unknown engine: the 1972-early 1981 sprocket shaft with 8½° (steep) taper is 1.400” at the largest point just before the collar. The 1981-88 shaft with 6° (shallow) taper is 1.310”. Click the picture for a larger view.
    1989-* motors with the original 3-piece flywheels (shafts integral with flywheel half) must use the older 1981-88 original or aftermarket replacement separate shafts sprocket and pinion shaft (not included). All other std. lower-end components, including your own rod set, bearings, etc. including the

commonized 1981-* OHV big twin 1¼” crank-pin (not included) may be re-used. No special parts (other than pistons, and shafts as described) are required for installation, and no welding or expensive machine work; this means that your project is less expensive.
    The flywheel material is far superior to the original factory cast-iron. Every individually crafted flywheel begins as a 80-55-06 ductile (nodular) iron blank, which is then heat-treated to 220-250 BHN. 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. If properly installed and maintained, they will not wear out, but give many years of trouble-free service. Ductile cast-iron is the superior material for flywheels, since its surface provides a better “grip” on the crankpin and shaft tapers than a steel forging to prevent slippage. Cast-iron also damps out internal vibrations better than steel.     Warning: this is more complex than a normal rebuild on a 74” engine, requiring prior experience and other assembly work. Flywheels must be balanced to your components.

V

ICTORY is the original source of side-valve performance since 1971.
Click here for a brief bio on the author: .

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    Payment & shipping instructions: please read carefully, and be sure to read Terms at the bottom of these instructions. Delivery to U.S. and specific foreign addresses only, sorry.
    The flywheels will be promptly shipped to your address in a strong box to insure safe delivery direct from the U.S. manufacturer to save you freight. You pay only the total price shown.
    There may (rarely) be a brief delay in shipment depending on production volume, you will be immediately notified if this occurs and offered a choice of waiting, an alternate stroke length, or a full refund.
    My address is below. Sorry, I can’t take your credit card directly, read below. All payments must be in US dollars, payable to Victory Library. The prices shown below in red are the total including postage, insurance and handling. Note: in some cases the foreign postage will be slightly less, which will be refunded. Important: you must include your local telephone number on all foreign orders for our customs declaration. Important: all postal charges were increased May 14, and the prices and tables below do not yet have the corrections. If your payment is not sufficient you will ne notified or receive a PayPal request for the correct amount. This inconvenience will be corrected as quickly as possible.

US

Priority Mail, Std.

Priority Mail, TM

U.S.A. (49 states, except New York)

$ 288.90

$ 344.95

New York State (includes 8.75% sales tax)

$ 325.05

$ 375.13

Country

Airmail, Std.

Surface, Std.

Airmail, TM

Surface, TM

Canada

$ 317.10

$ 300.25

$ 367.10

$ 350.25

Europe: Belgium, Denmark, Finland, France, Germany, Great Britain, Greece, Iceland, Ireland, Israel, Italy, Netherlands, Norway, Portugal, Spain, Switzerland

$ 378.65

$ 315.45

$ 428.65

$ 365.45

Sweden

$ 378.65

$ 338.35

$ 428.65

$ 388.35

Pacific: Australia, Japan, New Zealand

$ 403.95

$ 327.90

$ 453.95

$ 377.90

All other foreign countries not listed above: click here for a Table of Postage categories if you're not sure which rate applies to you: .

Use your Visa or Mastercard to pay with PayPal

Standard Weight Stroker Flywheels

U.S.A.

Canada

Europe

Sweden

Pacific

Other Foreign

Priority

Airmail

Surface

Airmail

Surface

Airmail

Surface

Airmail

Surface

Airmail

Surface

“

” Stroker Flywheels

U.S.A.

Canada

Europe

Sweden

Pacific

Other Foreign

Priority

Airmail

Surface

Airmail

Surface

Airmail

Surface

Airmail

Surface

Airmail

Surface

    Due to the high fee that PayPal charges me, a service charge is included in this purchase. This is less than it costs me to collect this money, and more convenient than your bank. If this is not convenient, use your local postal or bank money order.

If you prefer, use a postal or bank money order only, please (no personal or business checks), and mail to:

Victory Library
Post Office Box 133
West Hempstead NY
11552-0133

Please include your e-mail address.