Cook Nielson's Top Fuel Sportster...
Cook Nielson's Top Fuel Sportster on the trailer in the pits at Atco Raceway. (Circa 10/26/69)
As time passed and my friends and I entered our senior year of high school, we had more important things than scooters to focus on, such as college. Hence, we either sold our scooters or they sat in the garage collecting dust. For me, several years passed without owning a bike. Then, in the summer of 1964, I got a hankering to get a Harley, which is what I always wanted when I was a teenager. Maybe my rekindled interest in cycles was because my friend Marty, who previously owned the Whizzer Sportsman, had bought a Panhead and was boring and stroking it out to 98 cubic inches. As it turned out, I ended up buying a '64 Harley. Officially, it was called an XLCH Sportster. The CH stood for Competition Hot. Unofficially, it was the Corvette of the motorcycle world-rugged, super-fast, and bulging with torque. All 55 cubic inches delivered 55 horsepower at 6,300 rpm-good for a 14.75 E.T. and 92 mph in the quarter mile.
Nevertheless, since I hopped up scooters as a kid, it was only natural to soup up the Sporty. As such, I contacted an old high school friend, Mark, who was working as a mechanic at the same Harley dealer my friends and I often visited years ago on Friday nights. Mark and his buddies quickly pointed me in the right direction for Harley performance: Tom Sifton, Doc Dytch, Jerry Branch, C.R. Axtell, Tom Rudd, and S&S, just to name a few.
Shown is the author's Sportster...
Shown is the author's Sportster in street trim after engine displacement was increased to 86ci with 3-7/16 inch bore cylinders, Big Twin pistons, and 2-inch SU carburetor.
So, during the winter of '64, out came the stock motor parts and in went 4-9/16 inch KH stroker flywheels, Doc Dytch two-ring stroker pistons, Sifton "minus-plus" cams, big XLR valves, bored-out Linkert DC carb and velocity stack, gutted mufflers, and close C-ratio transmission gears. The reworked 65-cubic inch motor pushed quarter mile performance to 12.10 E.T. at 110 mph. However, kick-starting the 65-incher was dreadful because it kicked back with such ferocity. When starting, I had to not only precisely position the pistons on the compression stroke, but also depress the ignition kill button until halfway through the kick to minimize kickback. Once the engine kicked back so hard that it sprained my ankle. For over a month, I had to beg my friends to start my bike so I could ride with them. I didn't think it was very funny, but they sure did.
The winter of '67 saw the addition of Dytch 3-3/16 inch big bore cylinders, Sifton "minus-minus" cams, stronger 4-5/8 inch stroke forged S&S flywheels and beefed-up crankcases. With 74ci, performance increased to 11.40 E.T. at 117 mph. During the winter of 1968, I replaced the bored-out Linkert with the new big-bore S&S carb, one of the first 100 made by S&S. The longer duration "minus-minus" cams actually made kick-starting the engine easier.
Bored and stroked AA/Gas Sportys...
Bored and stroked AA/Gas Sportys were popular at the Atco drags. (Circa 10/26/69)
Eventually, I bumped engine displacement to 86 cubic inches by way of 3-7/16 inch Trock cylinders, along with a beefy Trock transmission door, more radical Sifton cams, Baisley modified heads, and a 2-inch SU carb. Performance increased to 11.10 E.T. at 121 mph with narrow street tires and no wheelie bar. At this point, the engine had more power than the short wheelbased frame and 120 rear tire could handle.
At about the same time, Harley legend and top drag racer Leo Payne was tearing up the racetracks on his 75ci street Sportster, dubbed "Turnip Eater," and 74ci lay-down Top Fueler. Leo was an excellent engine builder and master at modifying and tuning gas and fuel carburetors. Once he began modifying his Sportsters, Leo quickly earned the reputation of having two of the fastest Harleys in the Midwest, turning 11.08s at 125 mph on Turnip Eater and mid-9s at 150 mph on his fueler. Turnip Eater started life as a '57 Sportster, and Leo purportedly coined the bike for eating up British imports on the dragstrip. Payne became known for his lightning-quick reaction times, won numerous titles, and set countless records in various sanctioned drag races during the '60s. In '69, Payne's trap speed of 201 mph on Turnip Eater made him the first rider in history to ride a non-streamliner faster than 200 mph.