Yamaha RD350

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By Analog

Custom Yamaha RD350
I know a couple of people who’ve owned Yamaha RD350s, and both remember the 1970s air-cooled twin with great fondness. I bet they haven’t seen an RD350 like this one, though. Called “S2RD”, it was built by Tony Prust of Illinois-based Analog Motorcycles. (If the name sounds familiar, it’s because Prust also built the lovely CB550 sidecar combination we featured six months ago.)
This bike started as a 1973 RD350 that was halfway towards a café racer conversion when the current owner bought it. After the bike sat around for years untouched, the owner commissioned Analog Motorcycles to finish the job.
Custom Yamaha RD350
“I started by cutting off the neck tube and welding on a Ducati S2R neck,” says Prust. “This allowed us to use a set of S2R forks and triples, and to complete the suspension, I also mounted a pair of Progressive Suspension shocks.” The original RD rear rim was then laced to the front hub to accommodate a wider front tire.
Custom Yamaha RD350
The rear hub and rim come from a Yamaha TZ250 GP bike, so that the stock drum brake could be replaced by a disc. The front and rear rotors and calipers are Brembo (both actuated by the right rear foot lever). Custom made black stainless brake lines from Hel are also fitted.
Custom Yamaha RD350
The clutch was converted from cable to hydraulic, using a Suzuki Bandit slave cylinder, while one-inch drag bars hide the internal throttle assembly. “All this was done to give a clean and streamlined appearance at the controls,” says Prust.
The engine is mostly stock, but has been treated to lightweight DG expansion chambers for a power boost. Uni pod filters and a high output RDDreams Chinoy digital ignition help performance still further.
Custom Yamaha RD350
Prust de-tabbed the frame and fabricated a battery tray to fit under the custom seat pan. The upholstery is combination of leather and Alcantara, with exposed white stitching. The final touch is the deliciously glossy black and white paint, applied by Kiel Sawusch of Crown Auto Body in Lake Bluff, IL.
The RD350 has lots of fans without any mods, but the Analog S2RD takes it to a whole new level. Sleek, compact and fast, it’s as close to two-stroke perfection as you can get.
[Images by Timothy Prust.]
Custom Yamaha RD350

 

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