The motor may look pretty,...
The motor may look pretty, but underneath that polish, it's a serious beast. Put an 18-tooth sprocket on there, and you'll need to upgrade to a triple-digit speedometer.
Engine
This Banshee features a slightly modified version of DRI's Eliminator engine kit. When we get done with the parts list, you'll understand why this is the perfect moniker. Starting at the intake, the Banshee utilizes a K&N filter with a Pro Flow intake flange. Next comes Duncan's Master Flow intake system, which is basically a redesigned boost bottle and intake boots for maximum airflow. The fuel-air mixture is controlled by twin Keihin 35mm PWK carbs that have been bored and polished with DRI's Super Flow mod. Replacing the stock reeds and cage are a set of Pyramid reed valves. The cylinders have been bored out, and in conjunction with the stroker crank, the Banshee's displacement is bumped up to 440cc. The extra 90cc of exploding fuel gives the Banshee all the low-end torque it was missing in stock form thereby allowing it to plow through the power-robbing sand with ease.
Duncan's cylinder porting is what really brings the motor package together. The port timing and flow is changed to place an emphasis on a wide powerband and work in conjunction with the stroker crank. Topping the cylinders is a Paul Turner Powerhead with custom domes. Finishing off the power package is a set of Paul Turner High-Rev pipes, hand-built and designed to maximize the Banshee's mid to top-end powerband, followed up by Fat Boy 2 silencers. A Vortex X10 CDI is used to maximize the ignition timing and allow you to change power curves on the fly. A Hinson clutch basket with straight-cut drive gear and DRI clutch kit are used to increase the reliability and longevity of the Banshee's clutch.
Just about everything that can, or should, be done to this motor, the guys at Duncan Racing have done it. You'd be hard pressed to find a faster and more reliable Banshee without swapping out the motor or running on alcohol. One thing to keep in mind when listing all these parts is that Duncan Racing developed almost all of them in-house. All the mods and bolt-ons were tested and specifically designed to work seamlessly together. The whole package was created to widen out the Banshee's powerband and give it more "ridable" power, not just increase the peak HP.
Suspension is often overlooked...
Suspension is often overlooked on duner Banshees, but not here. The Duncan project has top-of-the-line Roll Design A-arms up front and a +4 Laeger swingarm in the rear, with Elka elite shocks all the way around.
Finish, Braking And Tires
The Duncan duner is dressed to the nines with polished aluminum and chrome accessories. All of the motor polishing was done in-house, and most of the bolt-on shiny bits are available straight from Duncan Racing. The frame of the DRI Banshee is almost a work of art in itself; all of the unnecessary tabs were ground down, the welds smoothed, and the whole thing powdercoated a deep metallic blue.
The new ITP Dune Star tires provided plenty of forward traction, but we were still able to break them loose and slide into a turn with ease. The Dune Star's light carcass kept the unsprung weight to a minimum, helping flotation and suspension performance. Up front, the DRI Banshee has custom dual-piston caliper brakes to increase stopping power. With all the work in the motor department, it was nice to see Duncan beef up the brakes to match. The rear brake is stock but has an extended stainless brake line to reach back that extra 4 inches.