Wiseco's Yamaha YFZ350 Banshee Build

November 14, 2017 / by Kevin Bailey

We built a 2002 Banshee with some of the best products you can find. Check out the details and photos here!

Back when Wiseco was celebrating its 75th Anniversary, a Wiseco team member brought up the idea of doing a quad build project. Wiseco programmer, Steve Toutant, along with Engineering Manager Ryan Nau, took on this build project. Steve reflects on the build:

We started with a 2002 Yamaha Banshee with a blown motor, and more things wrong than you could even imagine. Ryan and I tore it down to the bare frame, and over 3 months, built it back to what you see. Every nut and bolt was either wire brushed and cleaned or replaced with new. The only parts that are original now are the cases, cylinders, rear grab bar, brake light, swingarm, steering stem, wiring, and assorted brackets and parts.

The 2002 Banshee before the rebuild began.

The engine was rebuilt with a Wiseco crankshaft assembly, with runout measuring less than .001". Next, Ison racing engines bored the cylinders to .040" over, and we placed in a set of Wiseco Pro Lite piston kits.

Reassembly with a set of Wiseco Pro Lite pistons and a fresh Wiseco crank.

When it was assembled, a Wiseco clutch basket and clutch components were added. We also replaced the stator and flywheel with a NOS setup we had in storage for a rainy day. The stock carburetors were fully rebuilt, the bodies remaining the only original carb pieces. We added the tors delete while we were at it.

Next up, Boyesen set us up with a set of their Rad Valves, which we couldn’t be happier with. The Banshee had FMF pipes and silencers when we got it. They were still in decent structural condition, but the finish was ruined. So, we had them powder coated in 1,500 degree high temp powder.

The Wiseco Banshee features Boyesen Rad Valves, a Wiseco cluctch, and custom high-temp powdered coated FMF exhaust.

The stock wiring was tediously cleaned and rewrapped. The brake master cylinders were all rebuilt, as well as the calipers, with all new seals, pins, and bolts. To top it off, new pads, rotors and lines were added as well. The swingarm, linkage and carrier all received new bushings, sleeves and bearings. The Banshee also received an extended axle from Magnum ATV.

The Banshee received all new bushings, sleeves, and bearings, in addition to rebuilt brake calipers and master cylinders.

The front end was treated to new Alba +2 +1 A arms/tie rods, along with new ProX wheel bearings and steering stem bearings. Douglas Wheel hooked us up with a set of their best .190 Red Dot wheels and ITP rolled us a set of classic Holeshot tires to round out the modern classic look we wanted.

We went with a really nice set of Alba Nerf bars, which proved an easy install after the dreaded “drilling out the frame” mod due to prior neglect and abuse.

FPS Racing set the Banshee up with a high-quality radiator, and CV4 added all new hoses. Race Tech came through with suspension assistance in rebuilding the rear shock with all new internals, a new spring, and proper valving. They set up the front end as well with a set of shocks, which felt amazing and required no additional adjustment on our end.

We also fitted new Alba A arms and tie rods, freshly valved shocks by Race Tech, and an FPS Racing radiator.

Maier helped us with all new plastic to give it a fresh look, and a Ceet Racing Products seat cover and foam were added. This was much needed, considering the stock seat foam/cover were almost completely disintegrated.

Pro Taper bars, a Magnum clutch handle, Cycra Hand Guards and a new thumb throttle finished off the controls. A new ProX chain was also installed with TM guides and ProX rollers.

Maier plastic and Ceet Racing Products really helped give it a brand new look.

Additional parts replaced include a new Yamaha air box assembly with a ProX dual-stage air filter. A set of incredibly bright Warn LED lights finished this build off. This was one fun project, and I can’t wait to get some seat time on this Banshee!

We are beyond happy with how this Banshee turned out, and want to give a huge thank you to all the companies that collaborated with us!

Product suppliers:

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Topics: featured, Powersports, BIKE FEATURES

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Written by Kevin Bailey

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