Most customs start out with a frame and motor from the same donor. But sometimes it’s a mix and match affair?and every once in a while, we see a truly exotic pairing.
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.

The project kicked off about three-and-a-half years ago, when chassis specialists FrameCrafters reached out to Analog’s Tony Prust. They’d built a frame for an Analog project in the past?and were itching to work with the Chicago-based shop again.
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"
?They would take care of fitting whatever engine I chose and get it to a rolling chassis, and we would take care of the rest. I said: ‘Of course!’?
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.

Joints are either bolted or bonded with space-grade epoxy. The idea, Tony tells us, is to make production easier, and to create the perfect amount of rigidity and flex where needed.
Around the time FrameCrafter...