Motorcycle News - Pocket Rocket: Sticking a Ducati 250 into a Moto3 chassis
This pint-sized racer from Analog Motorcycles is the most unique match-up to come our way: a 1968 Ducati 250 ‘narrow case’ motor mounted in a Moto3 prototype frame, and wrapped in a plethora of hand-made bits.
Karsten of FrameCrafters made Tony an enticing offer: He had their first prototype Moto3 chassis sitting in the shop, and would Tony like to do a build with it?
The chassis was originally developed eight years ago, and has been used by a couple of pro AMA-level racers with the engine it was originally built for: a Yamaha YZ250. It’s a bi-metal design that combines chromoly tubing with billet aluminum junction points, and it’s a thing of beauty.
Around the time FrameCrafters pitched the idea, Tony came across three bikes’ worth of bits and pieces from vintage Ducati 250 singles. There was at least one complete engine in the pile, originally built for racing, so he sent that off to FrameCrafters to start mocking up the chassis.
FrameCrafters whipped up two front engine mounts, and a rear mount to attach the back of the engine to the frame and swing arm. Analog designed the subframe, which FrameCrafters then welded in to the Moto3 chassis.
The Ducati rolls on rebuilt Showa suspension from an Aprilia RS125. A set of 17” Sun rims was laced up to a modded Honda CB550 front hub and a custom made Barnes quick-change rear hub.
While FrameCrafters were fine-tuning the chassis, the leftovers from Tony’s pile of Ducati bits went to TJ at DemonTech. He put together another 250 engine, adding a 12V conversion and electronic ignition from Electrex along the way.
As soon as Tony had the rolling chassis back in the shop, he started working on a wooden buck for the new tank and tail. “I had been wanting to make all the body work myself this time. I had a mentor by the name of Devlin Hunt coming in and helping me hone the metal shaping craft a bit more. I was already doing fenders, seat pans, number plates, etcetera—but not a tank yet.”
“He unexpectedly passed away in February 2017, and that pulled all the wind out of my sails on the project.”
“So when I got to the Ducati fairing, I was a little more prepared. That was a big undertaking for me, and I am really pleased with how it came out.”
Poking out under the tail is a stainless steel Cone Engineering ‘Big Mouth’ muffler, hooked up to a one-off stainless steel pie-cut header. The tail light—an Analog catalog part—is mounted under the subframe; “similar to that of a GP bike set up for rain,” says Tony.
There’s a custom-mounted steering damper too, and Free Form Design machined up caliper mounts and rear set brackets. Capping it off is stellar upholstery from Dane Utech of Plz.B.Seated.
“To which we respond, unapologetically: Why not?”
via Bike EXIF http://www.bikeexif.com
July 30, 2018 at 12:09PM