One of our favorite things is stumbling across a photograph of an amazing build, then playing detective in an attempt to track down the builder. That is exactly what happened with this RD350 street tracker. We ran across a low-quality, uncredited image of the bike on Instagram, then proceeded to go down the rabbit hole of cyberspace, searching forums and list serves, before finally arriving at the builder: Scott Zupner of Hawaii.
Scott has been racing since the early 70s at Indian Dunes in Southern California. In 1996, he moved to Hawaii, where he’s been a sponsored professional surfer and motocross rider, and got hooked started racing Supermoto in 2010. As he says:
“Motorcycle racing is not just a hobby for me — it’s a passion and a way of life.”
Scott has long been a fan of vintage air-cooled two-strokes, as well as the flat track racers of the 60s and 70s. We can’t think of better tribute to those loves than this RD350 special, built in his personal shop. This is simply our favorite two-stroke tracker ever — an absolute ripper.
Below, we get the full story directly from Scott Zupner himself.
Two-Stroke Street Tracker: In the Builder’s Words
I have been racing motorcycles since the early seventies at Indian Dunes in southern California. I raced every weekend and also raced in the World mini gran prix several times. I also raced at Saddleback park. I continued to race and free ride motocross for my whole life I have also been a sponsored professional surfer as well.
I got back into racing MX in 1995 in San Diego and then moved to Hawaii in 1996 where I also surfed and raced MX. I had been racing 250 amateur class and did very well bringing home plenty of trophies. In 2001 I finished in the top 10 for the state of Hawaii expert class racing. I took some time off to achieve some personal goals in my surfing career and I accomplished that with many sponsors, contests and photo publications.
In 2010 I started racing Supermoto and was instantly hooked. I have not missed one single race in almost four years and continue to excel at the sport. Its for sure the most fun I’ve ever had on two wheels. Motorcycle racing is not just a hobby for me — it’s a passion and a way of life. I simply can’t wait till my next event.
Besides racing, I have been restoring and building motorcycles most of my life. I really like vintage air cooled two strokes. I build out of my personal shop in Hawaii.
The RD350 street tracker has a custom nickel plated frame, rebuilt motor, Yamaha AT-1 tank.
Shouldered rims, Dunlop tires. I was inspired to build the bike because I really love vintage flat track motorcycles similar to this style raced in the sixties and seventies.
I would classify this bike as a street tracker. It also has a MZB ignition, no battery but does have a lighting coil and is street legal. Also Jemco supplied the exhaust parts but were fitting to the bike in the shop.
-Aloha Scott Zupner
Other Two-Stroke Custom Motorcycles
Yamaha RD400 Street Tracker by Eber Temperan-Two-stroke tracker from a professional BMX rider… The Yamaha RD400, built from 1976 to 1979, was a lightweight giant-killer, a 44-horsepower two-stroke twin capable of embarrassing many of the era’s larger four-strokes. The bike simply […]
Yamaha R5 Cafe Racer by Zanutto Engineering-The Yamaha R5, introduced in 1970, was the first of Yamaha’s new generation of two-stroke parallel twin “giant-killers” — a design architecture which would evolve into the RD350, RD400, and even the liquid-cooled RZ350/RD350LC. Lee […]
Akin Moto KTM 300 Street Tracker-“A 2-stroke street tracker…that actually gets used on the street AND the track.” The KTM 300 EXC is a weapon — a street-legal, two-stroke enduro with a 51-hp liquid-cooled engine and dry weight of just […]
“Alpina” Suzuki T500M Cafe Racer by Paul Courbot-Paul Courbot of Titan Performance rebuilds the T500 he’s owned since age 19! The Suzuki T500 Titan, introduced in 1969, quickly earned a reputation as one of the best big two-strokes of the era, proving […]
Sick RD: Yamaha RD350 Cafe Racer-Yamaha RD350 Giant Killer from California… The Yamaha RD350 is one of our favorite two-stroke street machines of the 1970s. The 39-horsepower parallel twin could compete with larger bikes due to its excellent power-to-weight ratio, […]
Ideal RD: Yamaha “RD380” YPVS Café Racer-The ideal RD, built by the man who wrote the book on Yamaha Two-Strokes… The Yamaha RD350 YPVS type 31 — sold in the US as the Yamaha RZ350 — was one of the most […]
Top 10 Two-Stroke Customs of 2018-Here at BikeBound, it’s no secret that we are fans of 2-strokes, and it seems we’re not alone — two of our Top 10 Customs of 2018 were powered by RD350 engines. So we decided […]
Evil Restomod: Yamaha RZ392-Evil RZ: “It is a pure bred giant-killer, not for the faint of heart…” The Yamaha RZ350 was one of the last, great 2-stroke street bikes available in the USA. The ~50 horsepower parallel twin […]
Yamaha RZ350 Restomod-“When you downshift, people look around like the antichrist just landed…” The Yamaha RZ350 was one of the most modern two-stroke street bikes ever sold in North America. It had triple disc brakes, 18-inch wheels, oil […]
“Street Lethal” Kawasaki KX500 Cafe Racer-Meet the ultimate lightweight, big bore 2-stroke street weapon… The Kawasaki KX500 is one of the most notorious motorcycles ever built — a fire-breathing 2-stroke legend of motocross and desert racing whose power delivery has […]
Yamaha DT100 Scrambler by Revolt Cycles-Revolt Cycles of the Philippines continues to turn out customs full of moxie and nostalgia. Today, we’re proud to feature the shop’s 35th build, RVLT35, a 1980 Yamaha DT100X Enduro dubbed “Noli” — built for […]
Yamaha RZ350 Restomod by Keith Carlson-Dragon Slayer: 2-stroke weapon built for the Tail of the Dragon… Indiana’s Keith Carlson, who specializes in two-stroke builds, is one of our very favorite builders. Each year, Keith and his friend Steve Hoy of […]
Yamaha RD350 Custom by Moto Exotica-Two-stroke cafe racer from the foot of the Himalayas! Arjun Raina of India’s Moto Exotica, set in the foothills of the Himalayan Mountains, has made a name for himself building Yamaha RD350 customs. In fact, […]
Pagani Minicross Scrambler by El Pasillo Custom Classics-Nothing brings fathers and sons together like motorcycles. This is abundantly clear in the case of El Pasillo Custom Classics, an Argentine workshop created by four friends who share a passion in modifying bikes. Recently, […]
Suzuki GT380 Café Racer by Café Cycles-The Suzuki GT380 was a two-stroke triple with ram air induction and 38 horsepower on tap. The lighter weight sibling of the GT500 and GT750, this bantamweight smoker makes for one nifty cafe racer candidate. […]
Handbuilt Show 2018: Two-Strokes-The 2018 Handbuilt Motorcycle Show, which took place during Austin’s MotoGP weekend last month, proved to be the biggest and best yet. Hosted by Revival Cycles and BMW Motorrad USA, the Handbuilt Show aims at […]
Yamaha RZ350 “Lab Rat” by Swinndustries-The Lab Rat – a modern two-stroke screamer… The RZ350 was the final evolution of Yamaha’s two-stroke RD series street bikes — a liquid-cooled, dual-carb street weapon with 60 horsepower on tap, a wild powerband, […]
Hodaka Ace 100 Scrambler by Utopeia Moto Company-“America’s Favorite Trailbike” is Reborn… Ever heard of a Hodaka? Neither had we — not until we came across Utopeia Moto Company‘s staggering 1967 Hodaka Ace 100 on the floor of The Congregation Show in […]