TWO STROKE TUESDAY | 100-HORSEPOWER HONDA CR500 POWERED OUTLAW KART
Imagine the idea of going wide open around a slightly banked 1/6-mile dirt track inside the cockpit of a four-wheel, fire-breathing Outlaw kart. Add in a pack of competitive, leather-clad warriors chasing you around while pitching their single-cylinder karts within inches of your open-wheeled ride and you have the perfect recipe for an adrenaline rush. That’s why Outlaw racing has grown in popularity in recent years. Add in a star-studded cast of regulars, such as Monster Energy NASCAR sensation Kyle Larson, and it’s only natural that people will gravitate to the intensity that is Outlaw kart racing. It’s worth mentioning that Outlaw kart racing has the same power-to-weight ratio as Sprint cars, only is a much cheaper hobby.
Like many aspiring professional racers, Jojo Owens got a taste for karting at a young age. The Cottonwood, California native began racing at six years old and learned the difficult skills of finding traction and maintaining corner speed. Owens climbed the ranks, but stopped racing abruptly at 12. He pursued other forms of racing, like asphalt and motocross. Then, in 2016, Owens introduced his daughter to go-karts. She discovered the thrill of open-wheel racing. Jojo jokes that regardless of her feelings on the idea, she didn’t have a choice on the matter. “I’m from a racing family, and her mother is from a racing family. She’s in the sport, whether she likes it or not [laughter].” Not surprisingly, Owens found a renewed love in Outlaw kart racing after taking his eight-year-old to the track.
In terms of expense, Outlaw racing is relatively affordable. Motorsports such as Formula1, NASCAR, and Trophy trucks take deep pockets. Fortunately, the buy-in for an Outlaw kart is around $5,000 for a quality used piece. Of course, that doesn’t include all the other fees needed to go racing – tires, fuel, safety equipment, jack stand, etc.
Another attractive element of Outlaw kart racing is that money doesn’t necessarily determine winners and losers. Owens explains, “I have raced against guys that have $20,000 to $30,000 in a four-stroke engine and beat them on a Honda CR500. It’s mainly driver preference. I don’t see much difference, unless the guy I’m racing has a lot of money into his 450 four-stroke.”
Speaking of technology, the venerable Honda CR500 is perhaps the last bastion of hope for the two-stroke in Outlaw karting. Honda shelved the CR500 at the end of the 2001 selling season, yet it lives on in Outlaw racing. What’s the allure of the antiquated powerplant? Owens states, “The CR500 is such a great base motor. It’s reliable and makes a ton of power. We’re getting 100-horsepower to the rear wheels out of a single-cylinder engine. It’s kind of crazy. You can’t beat the CR500’s power-to-weight ratio.”
Surely Jojo Owens goes overboard by matching the cases, punching out the cylinder, increasing the compression by unfathomable amounts, and running 110 or 114-octane race fuel. In truth, the 27-year-old has his engine ported, and he slaps on a Banke exhaust or Factory Pipe from QRC. Those two modifications make a big difference. While stroker cranks are common among CR500 racers, Owens is leery of taking the plunge. That’s because he favors reliability over more horsepower. Instead, he prefers running a stock stroke long rod, particularly on higher speed tracks.
Inside the heart of Jojo’s 100-horsepower CR500 engine is a Wiseco forged piston. The piston undergoes a considerable amount of stress, given that Outlaw karting is all about mashing the throttle wide open in top gear (by the way, Owens’ transmission only has fourth gear and needs to be bump-started by a truck or ATV).
Jojo doesn’t seem worried about his piston choice. “I’ve tried other pistons, and I can’t get the amount of races out of them that I can with a Wiseco,” explains Owens. “I haven’t had any troubles with Wiseco pistons. The quality really stands out to me. I have gotten other pistons that are marked a certain size, but they’re way off. We match our cylinders to our pistons. When we get the Wiseco pistons, it’s usually within a thou. That’s really hard to do, especially when you’re making them in a big production run.”
In terms of service intervals, Owens rebuilds his top-end every three or four races. He has also gone much longer than that by mistake. In a ‘Can you believe what he did?’ scenario, Jojo admits that he lost track of time on one of his engines. Owens laughs, “I’ve gone as far as 17 races on an engine without changing the Wiseco piston. It was by complete accident on a back-up engine. My buddy was racing with it, and he put five rounds on it. Well, I put 12 races into it before him! The Wiseco piston didn’t crack or anything. I didn’t even re-ring it. The piston looked perfect and didn’t have any wear. It was amazing.”
The one area Owens really focuses on is the Keihin carburetor. He is constantly tinkering with the jetting. Jojo admitted that his trust air density gauge is the first thing he pulls out of his truck when he gets to the track. Owens monitors it all day long, continually making carburetor changes in an effort to get the engine to run right on the edge of being too lean. Jojo echoes what so many great Honda technicians before him have probably muttered, “My goal is to get all of the power I possibly can out of that CR500 engine. It’s a constant battle.”
Part of Jojo’s normal preparation is jetting. He constantly makes sure his jetting is where it needs to be depending on atmospheric conditions at each specific race.
Given that Honda ceased CR500 production 18 years ago, engine parts are becoming increasingly scarce. Engine cases are the most difficult parts to find. Fortunately, a lot of karting companies are still producing a variety of CR500 aftermarket parts. It’s inevitable that CR500-powered karts will eventually go the way of the Woolly Mammoth. What then? Four-strokes are a very popular alternative, especially Yamaha YZ450F and KTM 450SXF engines. They produce tons of torque and can be modified to match up cubic centimeter for cubic centimeter with the CR500. Track conditions do tend to play a big role in the success of a two-stroke or four-stroke engine. Owens states, “You’re going to dominate if you’re running a four-stroke on a bottom-line track. Of course, it also depends on the driver.”
‘Outlaw’ is in the sport’s name, but there are still equipment rules and regulations. Dual carburetors were banned the first week racers showed up to the tracks. Street motorcycle engines are another big no-no. Of course, the rulebook is different depending on where you race. The rule of thumb is to use a 500cc single cylinder dirt bike engine. However, there isn’t a stroke rule, and rarely is the cylinder bore examined.
Photo 8: Even though it’s dubbed ‘Outlaw’ racing, there are still a few rules. No dual-carbs or sport bike engines, but racers haven’t seen too much strictness on bore and stroke.
Like so many other sports, Outlaw kart racing is not exempt from the age-old East Coast versus West Coast argument. The open-wheeled motorsport has a huge following in California, but is also quite prevalent in North Carolina. Owens tries putting that debate to rest. “Honestly, I think our competition on the West is where it’s at. This is the heart of Outlaw racing, and guys come to California to race against the best. We have a lot of guys who have come up racing in this area that are in the big-time now.” Jojo is referring to motorsports studs Kyle Larson, Rico Abreu and Matt DiBenedetto, who cut their teeth racing Outlaw karts.
Unlike when he was a kid, there doesn’t seem to be an end in sight for Jojo Owens and Outlaw racing this time around. Not only has his daughter taken an interest in the sport, Jojo works full-time as a construction foreman and still finds time to race on the weekends. That’s commitment. When asked what’s so intriguing about racing in the winged karts, Jojo smiles. “You have guys inches away from you, and you’re sitting inches off the ground. There’s no real word to describe it, other than ‘crazy.’ You have to throw the kart into the corner at full speed, and hopefully the guy in front of you throws it in the same way, because you’re so close to each other. It’s open-wheel racing, and it’s a disaster if you come together [laughter].”