CR500AF: The Ultimate Two-Stroke Hybrid

The Roar of the Past Meets the Precision of the Present

For many, the Honda CR500R evokes a sense of raw, untamed power – a legend in the world of motocross and off-road riding. While Honda ceased production of this iconic two-stroke machine several years ago, its spirit and performance continue to captivate enthusiasts. This is where custom builders like Service Honda step in, bridging the gap between vintage brawn and modern engineering. This article delves into the specifics of the CR500R engine, its place in motorcycling history, and the remarkable feat of integrating it into a contemporary chassis, exemplified by the CR500AF (Aluminum Frame).

What Year is the CR500R Engine?

The specific CR500R engine discussed in the provided context is from a 1998 model. This particular engine has undergone a complete rebuild, featuring Wiseco engine parts, including an 89mm piston, and has zero hours of use since the overhaul. This ensures that the heart of this hybrid machine is as potent and reliable as possible.

Why Did Honda Stop Making the CR500R?

Honda's decision to discontinue the CR500R was a complex one, driven by evolving market trends and technological advancements. The rise of four-stroke engines, with their smoother power delivery, reduced emissions, and often simpler maintenance, began to overshadow the appeal of high-horsepower two-strokes for a broader audience. Furthermore, the CR500R platform had remained relatively unchanged for a significant period, while other models, like the CR250R, saw more frequent technological updates. This technological stagnation, coupled with a decreasing demand for open-class two-strokes, ultimately led to its removal from Honda's lineup.

However, a dedicated segment of riders still craved the visceral thrill and explosive power that only a 500cc two-stroke could provide. These riders found four-strokes to be too 'civilized' and missed the characteristic step in the powerband where the engine's output would surge dramatically. While a modern 500cc two-stroke might not offer vastly more peak horsepower than a contemporary four-stroke, the way it delivered that power was fundamentally different. The CR500R's powerband, particularly in its mid-range, could deliver an 18 horsepower increase within a mere 1500 rpm. This characteristic made it an exhilarating machine for situations requiring sheer grunt, such as powering through hills, deep sand, or long, sweeping corners, creating a sensation akin to being launched by a giant rubber band.

The Birth of the CR500AF: Service Honda's Innovation

Recognizing the unmet demand for a modern iteration of the CR500R, Service Honda began its innovative journey in 1997. Their solution was to transplant the potent CR500R engine into the then-current CR250R aluminum chassis. This creation, known as the CR500AF (Aluminum Frame), offered riders the best of both worlds: the legendary power of the 500cc two-stroke combined with the lighter, more agile handling characteristics of a modern motocross frame.

As Honda continued to evolve its motocross chassis, Service Honda kept pace. The latest CR500AF models, such as the one described, utilise the most recent generation of Honda's aluminum chassis. In this case, the 2015 CRF250R chassis was chosen for its fourth-generation design, providing the CR500R engine with a modern, technologically advanced platform. This means that in terms of handling, ergonomics, and overall feel, the CR500AF is as contemporary as any other modern Honda motocross or off-road bike.

What's It Like to Ride a CR500AF?

Riding a CR500AF is an experience that's difficult to fully articulate. The sheer level of excitement and acceleration generated by the 500cc two-stroke engine, when housed in a chassis that feels lighter and more compact than the older steel-framed CR500Rs, is immense. The sensation is one of pure, unadulterated power.

The engine is kickstart only, a nod to its two-stroke heritage. While it requires a full-travel, energetic kick, it typically responds with enthusiasm to a decent effort. The vibration is noticeable when compared to modern four-strokes, but it's an expected and even endearing characteristic of a 500cc two-stroke. Once warmed up, the engine is eager to unleash its capabilities.

Riders often find themselves seeking out longer straights, steeper hills, and wider corners simply to maximise the opportunities to experience the engine's thrilling power delivery. The power is undeniably addictive, and the bike truly comes alive when its full potential is unleashed. The $8999 suggested retail price provides the core package, but many owners opt for additional enhancements. These can include billet rear caliper mounts, engine covers, triple clamps, and crucially, suspension modifications.

The Importance of Suspension and Fuel Capacity

Given the significant increase in power and the slightly increased weight of the CR500R engine compared to its 250cc four-stroke counterpart, upgrading the suspension is almost a necessity. The stock suspension on a CRF250R, while excellent for its intended purpose, may struggle to cope with the demands of a potent 500cc two-stroke. Many riders report that a CR500AF with stock suspension would likely not perform optimally. Therefore, investing in suspension modifications, such as those offered by MX Tech, is highly recommended to harness the engine's power effectively and ensure stable handling.

Fuel capacity is another consideration. The stock fuel tank on a CRF250R may be depleted faster due to the thirstier nature of the 500cc two-stroke. For extended rides, both on the track and off-road, upgrading to a larger aftermarket tank, such as a Clarke unit, is a practical modification. These tanks often offer improved clearance for components like coolant fittings and spark plugs, and their larger capacity reduces the frequency of refueling stops.

Track Time and Off-Road Adventures

The CR500AF truly shines on a motocross track that features a good flow and longer straights, rather than tight, jump-filled courses. While controlling the power for short-approach jumps requires precise throttle management, experienced riders can maintain a neutral stance in the air. The bike tends to perform better in softer dirt conditions than on sticky hardpack.

When the weather turns, and the motocross tracks become less accessible, the CR500AF proves equally adept in the desert. With ample space to exploit its power, the bike's fun factor escalates even further. It possesses an incredible ability to climb virtually any hill, and even with stock motocross gearing, it offers substantial top-end speed. Whether on the track or in the wilderness, the handling remains remarkably similar to that of a standard CRF250R, which is to say, it handles very well. The lighter front end, a consequence of the engine swap, becomes familiar with use.

The braking system on the CRF250R chassis, designed for a 250cc four-stroke, is surprisingly capable of managing the increased velocity of the CR500R engine, performing admirably in demanding situations.

The Ultimate Playground: Sand Dunes

For riders who truly appreciate the raw power of a 500cc two-stroke, sand dunes represent the ultimate playground. Here, the CR500AF's prodigious power can be unleashed at will, allowing riders to spray sand and experience exhilarating acceleration. Even without specialized paddle tires, the bike's sheer grunt is enough to conquer the sandy terrain, leaving riders with massive grins.

Is the CR500AF for You?

It's important to acknowledge that 60-horsepower 500cc two-strokes are not for everyone. If they were universally popular, manufacturers would likely still be producing them. Service Honda understands this niche market and caters to a specific breed of rider – those who believe that too much power is just the right amount. Many of these riders also appreciate the inherent simplicity and ease of maintenance associated with non-power valve two-stroke engines.

The desire for a machine like the CR500AF stems from a fundamental passion for performance and speed. It embodies the spirit of American hot-rodding, where the goal is to shoehorn larger, more powerful engines into lighter, more agile vehicles. The Service Honda CR500AF is a distilled representation of performance, with comfort and civility taking a backseat. It's a machine for those who understand and embrace its unique character.

Frequently Asked Questions

Q: What year is the CR500R engine used in the CR500AF?
A: The specific engine mentioned is from a 1998 CR500R.

Q: Why did Honda stop making the CR500R?
A: Honda ceased production due to evolving market preferences favouring four-strokes, technological stagnation of the platform, and declining sales for open-class two-strokes.

Q: What chassis is the CR500R engine typically put into for the CR500AF?
A: Service Honda typically uses the latest generation CR250R or CRF250R aluminum chassis for their CR500AF builds.

Q: Is the CR500AF easy to start?
A: It requires a firm kick, but it generally starts with enthusiasm. It is not an electric start model in its standard configuration.

Q: Does the CR500AF require suspension upgrades?
A: Yes, due to the significant power and weight of the 500cc engine, suspension modifications are highly recommended for optimal handling and performance.

Q: Can the CR500AF be used for off-road riding?
A: Absolutely. While capable on the motocross track, the CR500AF excels in off-road environments like sand dunes and open trails where its power can be fully utilized.

Expert Opinions

Karel Kramer (6'1", 205 lb, B rider): "I used to love 500s for moto and off-road, and I have to admit this Service Honda is nonstop sensory overload. It is capable of docility, but why waste it? Sometimes you want the right tool for the job; other times you look for the right job for the tool. I spent my seat time looking for the best job for 60 ponies! As thrilling as the 500 is, I'm not ready to trade in my E-start four-stroke."

Jimmy Lewis (5'10", 180 lb, Vet Pro): "I've ridden some of the biggest, baddest horsepower-spewing dirt bikes ever built. They were either extremely heavy twin-cylinder bikes or very short life-span, full-race motors. All were outrageously expensive. Not this CR500: It is just like the 2005 CR500R Honda would have built for all intents and purposes. It's light, puts out big power-right now-and will last a long time. For the right guy, and you know who you are, this is a great bike. I rode it in the sand dunes for photos, and that was a match made in heaven. It is a little on the gnarly side for trail riding and even for moto; yet the one thing this Service Honda really proves is how truly good modern four-strokes have become. But there is nothing like the smell of premix in the morning."

Contact Information:
Service Honda
219/932-3588
www.servicehonda.com

If you want to read more articles similar to CR500AF: The Ultimate Two-Stroke Hybrid, you can visit the Motorcycles category.