"Indian" & "Scout" names for reference purposes only. Not affiliated with Indian Motocycle Co.
Indian Junior Scout Stroker Pistons
This is a brand-new quality product from the famous “Truett & Osborn” company designed for use in Harley-Davison 45” stroker engines for street or racing use.
At first glance, they appear to be a fair match for Indian Junior Scout and military 741/GDA engines when overbored to 2-3/4” (2.745” or 69.72mm) and stroked to 3-13/16” (3.8125” or 96.84mm) using
Harley-Davison 45 or Sportster stock flywheels and rods. The final product is 45.12” or 739.5cc, the same as the H-D 45.
The actual pistons are shown right, click the image for a larger version. Please: you must do your own research, measurements and calculations. No assembly has been made so far using these pistons in a 741, so this is still unexplored territory, but they offer a competitive (and price) advantage to those bold enough to attempt this ambitious project. The compression distance (measured from the wrist pin center to the piston’s top surface) is approximately 1.23”, which appears to be slightly taller than needed for this stroke, so a cylinder base shim, machining off the piston dome etc. may be needed. Final deck height is the responsibility of your engine builder and must be set properly for safe and effective use of these pistons. The H-D wrist pin at .791” is larger than the Scout at .750” but may fit the Scout pin bushing after reaming. I cannot provide any more information on this subject. Information on adapters to use H-D flywheels in the 741 are available here: .
The pistons are suitable for flywheels with 3-13/16” (3.8125”) and slightly larger strokes. Larger strokes will require small base shims (equal to 50% of the added stroke above 3-13/16”) and potentially minor skirt clearancing. You cannot use these pistons with stock Scout or Junior Scout flywheels, or any stroke smaller than 3-13/16”. You cannot use these pistons with “pop-up” heads, such as Sport Scout Bonneville, 648 etc. The pistons are cast in low expansion aluminum alloy, and use the thinner, late H-D 45 & K rings available anywhere.
The available pistons and rings are shown in the table below. You must specify the exact size you need. Sizes are based on std. = 2.745”. Sizes are nominal -.005” for skirt clearance. For example: a +.020” piston is actually 2.760” and requires a finish honed bore size of 2.765”, &c. Please measure your cylinders accurately, no refunds or exchanges will be made after purchase.
For ring sizes not available, the choices are:
1. Order the next larger pistons with rings.
2. Order your original size, but with .010” larger rings (for example: +.060” pistons with +.070” rings, etc.) so you can file the rings to get the correct end gap yourself.
3. Order your original size, but without rings, and purchase a ring set from another source. If you do this, deduct $20.00 from the price.
Piston & ring sizes available
This is more complex than a normal rebuild, requiring prior experience and other assembly work. Victory does not install these parts.
For information on using these pistons in the H-D 45 engine click here: .
ICTORY is the original source of side-valve performance since 1971. Click here for a brief bio on the author: .
Payment & shipping instructions: please read carefully. Price per set (1 pair): $145.00 plus shipping, insurance and handling (& sales tax if delivery to NY State address).
The pistons will be shipped to your address by Priority mail (U.S.) or First Class Mail International (foreign) on receipt of payment, direct from the U.S. manufacturer, complete with a full ring set and fitted piston pins & locks as shown, to save you freight in a strong box to insure safe delivery. There may (rarely) be a delay in shipment depending on production volume. You will be immediately notified if this occurs and offered a choice of waiting, an alternate oversize, 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.
All foreign orders must include your local telephone number for our customs declaration.
Mail your postal or bank money order only,
please, (no personal or business checks) to:
Post Office Box 133
West Hempstead, NY 11552-0133 U.S.A.
Please include your e-mail address.
All other foreign
Use Visa or Mastercard to pay with PayPal
All payments must be in US dollars. You must specify the piston size and your phone number
All other foreign countries
Due to the fees 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 you prefer, use your local postal or bank money order.