Motorcycle News - Extreme Machine: Unscrambling the Triumph Scrambler
He’s effectively unscrambled this Scrambler 900, transforming it into a tire-shredding, street tracker-styled liter bike—with a touch of cafe racer flair. And it’s such a coherent build, it could easily be mistaken for an OEM concept.
But here’s the crazy part: his machining and fabrication skills are self-taught. (He has a degree, but it’s in anthropology.) And this is only his fourth build.
Justin started by stripping the frame down to just the backbone. Then he bent up some tubing to build a new rear section, with interesting lines that mimic those of the motor.
Moving to the suspension, Justin converted the Scrambler 900 from a twin shock to a monoshock setup. He’s used a custom-built, fully adjustable shock from Gears Racing USA.
“The Marzocchi forks have nearly seven inches of travel,” says Justin. “So to match that, I designed the rear mono-shock setup to achieve the same seven inches of travel. This gives the bike an amazingly enjoyable ride on any terrain.”
The wheelset is fully custom: 17” Excel rims, laced to Talon hubs with stainless steel spokes. The rear hub’s a Triumph replacement unit, but the front was originally made for a KTM 990 Adventure. Both rims were finished in a cobalt-colored layer of Cerakote for maximum durability.
The brake upgrades are more than warranted—because the motor in this Scrambler 900 is far more monstrous than the original. Justin ripped it out, and entrusted it over to Bill Gately of Bonneville Performance for a serious overhaul.
The head was worked too, with a full porting and polishing job and a set of custom ground cams. Further down, the counterbalance system was removed, and the crankshaft dynamically balanced, allowing the Triumph to rev more freely.
“We have doubled the horsepower and torque of the motor with this combination,” says Justin, “and shifted the peak horsepower and torque to a more street friendly RPM range. Gobs of power are on tap at any moment. Just twist the throttle to your desired amount.”
Justin had to graft in the Triumph tank’s tunnel so that he could retain the original fuel pump placement. And he welded in a Suzuki GSX-R fuel filler neck, to give him a wide range of aftermarket filler caps to pick from.
The tail section was sculpted from carbon fiber, to match the lines of the Scout tank. Justin built a two-piece mold, then hand-laid and vacuum formed the final part from multiple layers of carbon fiber. The front fork fender-slash-fork guards followed the same process.
All of the above goodness is matched to a new electronics package. The OEM dash is gone, replaced by a tiny speedo and a keyless RFID ignition, both from Motogadget. Lighting is provided by a powerful Truck-Lite LED headlight, and an LED taillight that’s been Frenched into the tail section.
With a huge weight reduction and power boost, and improvements in suspension and braking, Justin really has unleashed the beast. “It’s the tire-shredding, pavement-eating monster that I knew was hiding within,” he says. “This bike is truly an experience when you ride it. It just begs you to twist the throttle and let it eat.”
via Bike EXIF http://www.bikeexif.com
August 16, 2018 at 12:27PM