WICHITA, Kansas based performance specialist Truett & Osborn say that their new cast stroker pistons for Harley 25 inchers are "the perfect choice to go along with our stroker flywheels for the 45 cubic inch flatheads."
Made with correct cam grind and material to eliminate problems with piston seizing and loose fit, they come complete with rings, pins and clips and are available in Std, +.010, +.020, +.040 and +.060.
These pistons are said to arrive at the same height in the cylinder as a stock piston, when used with 4 7/16” stroke. They are also available for 4 ½” and 4 5/8” strokes. The piston will arrive approximately .030” higher in cylinders with 4 ½”, and the piston will “pop-up” above head gasket surface when used with 4 5/8” stroke.
Founded in 1970 by Paul Osborn, Truett & Osborn owe their v-twin performance engineering credentials to the legendary drag racing exploits of Sturgis Hall of Fame inductee Bonnie Truett.
Truett started racing in the 1960s, and was constantly working to get more out of his drag bikes. He started by changing the flywheels in his own Sportster, but eventually he and Paul Osborn started to create and manufacture their own flywheels, frames, cams, cylinders and rods.
In the 45 years since Truett & Osborn set out on their quest for cubic inches, over 15,000 sets of their stroker flywheels have been installed "without a single failure, even in the blistering conditions of top fuel."
This year again sees Truett & Osborn sponsoring their 44th annual Motorcycle Drag Races on August 15-16 at the Kansas International Dragway.
TRUETT & OSBORN
www.truettandosborn.com