is a brand-new quality product made in America by the famous “Truett & Osborn” company for all Harley-Davidson 74” F-Series
motors with Timken bearing (not roller) sprocket shafts 1956-71 including 1956-65 panhead, 1966-69 generator shovelhead and 1970-71 alternator shovelhead for street or racing use. This is exactly what you need as the foundation for your high-performance motor. Click the picture for a larger view.
These flywheels can also be installed in the later 1972-early 1981 alternator engines by using a 24001-70 sprocket shaft (which has the correct taper for these flywheels, and fits the 1970-* alternator engines for length and spline), and the correct pinion shaft for your own engine (1972: 24006-58; 1973-81: 24006-73).
Looking for other stroker flywheels? Click here: .
Nothing adds torque like stroker flywheels! Gives
you the power for high cruising speed, and better acceleration, also increases compression. The flywheels are lighter than stock, which also helps throttle response and acceleration.
These flywheels can also be ordered in the famous “
” heavyweight variety with about 4 lbs. more weight at $50.00 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: . Important: for TorqueMonsters I must know the year of the crankcases you are using: generator (1955-69) or alternator (1970-71).
This is a very reasonable investment - it’s only
a small part of your total motor cost, and does more in one step than
anything else - more than hot cams, bigger carburetor, etc., although those
parts will work even better on your stroker motor. This is not a radical, dangerous and short-lived modification, 80” panhead stroker motors have been built for over 40 years.
The motor will not explode, overheat, be difficult to start, or wear
out immediately (the extra piston travel does shorten the time between top
end rebuilds slightly, but we’re talking about years, not months).
The flywheels are 4½” (4.500” stroke = 84”) stroke, are furnished in the original 8.50” outside diameter which will safely clear the case scraper in all motors, and are a direct replacement (except for stroke length and weight) for the original flywheels in these motors. This is the largest stroke that I feel is practical for long-term street use, only ¼” longer than the factory 80” shovelhead and Evo motors.
These flywheels use all std. 74” F-Series lower-end components, including your own rod set, shafts, bearings, etc. No special parts (other than
pistons) 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, requiring prior experience and other assembly work. Flywheels must be balanced to your components.
the original source of side-valve performance since 1971.
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Price: $425.00 + postage, insurance, handling & customs fees. Payment & shipping instructions: please read carefully, and be sure to read Terms at the bottom of these instructions.
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.
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.
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Terms: the product being sold pursuant to the instructions listed above, and safe delivery of same to the buyer, are warranteed only by the manufacturer and the carrier, respectively, and are not warranteed by Victory, Jeffrey Diamond, or any person acting on their behalf. All sales are final unless the product is not as described. Any claim for loss, damage, or defective product must be made against the carrier or the manufacturer, respectively. By purchasing this product you agree to these terms, and to hold Victory, Jeffrey Diamond, or any person acting on their behalf harmless from any claim, direct or indirect, arising from this transaction or any subsequent transaction, and to seek satisfaction solely and exclusively from the manufacturer and/or carrier. If these terms are not acceptable to you, please do not purchase. If you have a question, or require additional explanation of these terms, please e-mail before purchasing.