HOMEWRECKER: Supercharged Kawasaki KX100 Land Speed Racer

Supercharged Salt Racer from Casey Anderson… 

If you love custom motorcycles, we highly recommend a pilgrimage to Bonneville Speedway at some point in your two-wheeled life. Each year, the vast Bonneville Salt Flats west of Salt Lake City, Utah play host to some of the wildest, fastest custom creations on the planet — one-off two-wheelers, many of them designed and built in home garages and backyard sheds, which go flying across the salt in pursuit of land speed records.

When we were there for the 2021 AMA Motorcycle Speed Trials, we were astounded at the both the creativity of the two-wheeled landspeeders on display and the friendliness and camaraderie of the racers in attendance. In recent years, we’ve loved seeing more and more land speed bikes turn up at the nation’s most prestigious events, and we spied this supercharged KX100-powered two-stroke land speed machine at the recent Handbuilt Show in Austin, Texas.

It’s the work of Casey Anderson (@motorcycles_and_art), an Army veteran who grew up with “hippy biker” grandparents, started out on a Honda Trail 70 searching out the best jumps he could find after school, and got into building custom choppers after he returned from Iraq. His grandparents’ passions would heavily influence his own vision for the bikes he builds.

“As my grandfather’s love for motorcycles influenced my life, my grandmother’s love for art also influenced my life. She taught me how to paint and I still do today. I firmly believe that there is a magical connection between art and engineering that creates motorcycles.”

Amen to that! After years of building choppers and customs — and learning after a stint building bikes full-time that he’d rather “treat motorcycles as art, not income” — Casey was beginning to get burned out, losing interest in bikes. He needed a new spark and challenge. Then he stumbled across one of the great Bonneville films, Out Of Nothing, which follows brothers Carl and Mark Bjorklund and the rest of the crew from Super Rat, a record-winning Bonneville land speed team. Says Casey:

“Out Of Nothing…documents the lives of a group of friends who have normal jobs and have semi normal lives but dedicate themselves to land speed racing. This documentary planted the seed of my next challenge in my life. I knew I had to build a land speed bike.”

Casey quickly decided to focus on a small displacement class for a number of reasons:

“This was due to the lower cost of parts and the bigger challenge. What is harder, to make a fast bike go faster or to make a slow bike go fast? I chose to make a slow bike go fast.”

Casey chose as his base the Kawasaki KX100, a “super-mini” motocrosser whose 99cc two-stroke engine makes ~24 horsepower in stock trim. Of course everything else would be custom-built, including the lay-down chassis that’s essential to set records in the classes he competes in, making the machine as aerodynamic as possible.

“This is when I got the 2×4’s out and started to clamp them to various objects and start mocking up the bike. My plan is to have the fastest 100cc motorcycle on the planet. There is a very fine team in Australia that currently holds the record and my goal is to take the record from them. Current record is 131mph.”

Casey has done all of the work himself: design, engineering, fabrication, wiring, paint, etc.  The bike is running a Honda CT90 tank and forks, and the engine has been ported and tuned to run at higher RPM.

So far, Casey has run “Homewrecker” at Bonneville twice. He missed the first year underestimating the work the build would entail. The second year he ran in the naturally-aspirated class and did well but was hit with a hard dose of reality.

“I quickly learned that the people before who have set all of these records, from all different places of the earth, are the best of the best. I quickly learned that this will not be easy.”

It’s a testament to Casey’s character that such challenges have only fed his fire. Last year he developed a very interesting design to give him an edge over the competition: an electronically controlled expansion chamber, which shrinks and expands according to engine RPM to keep the two-stroke engine inside its narrow powerband — brilliant! Says Casey:

“This was actually a successful design; however, I blew two engines that week trying to dial it in, then finally had to call it quits when a part of the frame broke.”

For 2024, Casey has pushed the envelope even farther, adding forced induction. That’s right, this 99cc two-stroke is now running an Aisin 300 supercharger with custom intercooler, 60psi fuel system, and custom ignition system he programs on his laptop.

“Estimated horsepower with 5psi of boost is 40hp and with 10psi of boost is 50hp at 15,000rpm. We will be shooting for 120mph without any type of streamlining.”

What does it feel like to race a 200-lb machine at triple-digit speeds, on your belly, across the salt flats? Casey recently discovered an apt parallel while taking a commercial flight:

“As the plane starts to go down the runway and pick up speed and the plane starts to shake like hell and makes that deep, dark rumbling sound that fills your ears as it pushes you back in your seat… That is exactly what it feels like to ride this bike down the salt.”

Casey, we’re impressed with the creativity and countless hours of research, development, and good old-fashioned elbow grease you’ve put into this build. We’ll be cheering you on this summer as you and “Homewrecker” aim to set a record on the salt. Godspeed, man!

“Homewrecker” LSR: Builder Interview

• Please tell us a bit about yourself, your history with motorcycles, and your workshop.

I grew up with motorcycles. My grandparents were hippy bikers. My grandpa rode anything from a chopped CB350, Harleys, and all the way to a Kawi H2. My first motorcycle was a Honda Trail 70. I did my best every day after school to make the biggest jumps and push the limits of that fine machine.

As my grandfather’s love for motorcycles influenced my life, my grandmother’s love for art also influenced my life. She taught me how to paint and I still do today. I firmly believe that there is a magical connection between art and engineering that creates motorcycles.

When I was in the Army and got back from Iraq, my buddies and I started to chop our bikes in the parking lot of the barracks. Flying around town half buzzed on sketchy chops are some of my best memories ever. Ever since then, my garage has always been full of bikes. Half mine and half my buddies. I can’t tell you how many choppers have been built in there let alone how many carburetors cleaned.

Years ago, after winning many motorcycle shows and the influence of my friends, I started to build bikes for a living. After a bit I could not do it anymore. It made life unenjoyable. Your brain cannot stop thinking about why the number two cylinder isn’t firing correctly or the constant urge to punch the “know it all” customer in the jaw. I quickly found out that I need to treat motorcycles as art, not income. Motorcycles are my escape.

About five years ago I became very bored of motorcycles. Suddenly, it was all the same. To the point that I didn’t even have to think about it. I was just going through the motions. Even building a chopper or custom bike became dull. I had plateaued. I needed a greater challenge.

We have all heard of Bonneville and we all know about land speed racing however for some reason it is very foreign to the majority of us motorcyclists. One day I happened to watch the documentary Out Of Nothing. It documents the lives of a group of friends who have normal jobs and have semi normal lives but dedicate themselves to land speed racing. This documentary planted the seed of my next challenge in my life. I knew I had to build a land speed bike.

The one thing that I have learned about building a land speed bike is: It’s like building a custom chopper but it actually has to perform.

• What’s the make, model, and year of the donor bike?

I decided to race in the smaller cc class. This was due to the lower cost of parts however the bigger challenge. What is harder, to make a fast bike go faster or to make a slow bike go fast? I chose to make a slow bike go fast.

After doing a shit ton of research, I decided to use a Kawasaki KX100 engine. This engine stock makes 24hp at the crank.

I knew if I wanted to break records I would to need to go fast. Well, to go fast, you need to have low drag. To have low drag, you need to be laying down. The less frontal area the better.

This is when I got the 2×4’s out and started to clamp them to various objects and start mocking up the bike. My plan is to have the fastest 100cc motorcycle on the planet. There is a very fine team in Australia that currently holds the record and my goal is to take the record from them. Current record is 131mph.

The first year that I decided to build the bike, I missed the race. I absolutely underestimated how much work goes into building a land speed bike. This was a great slap of reality.

The second year I raced on the salt. This was in a naturally aspirated design. I did well; however, I was once again slapped with another dose of reality. I quickly learned that the people before who have set all of these records, from all different places of the earth, are the best of the best. I quickly learned that this will not be easy.

The third year I came up with an ingenious idea. To create an electronically controlled expansion chamber. This expansion chamber would shrink or gain in length in accordance to the engine’s RPM. This would keep the two stroke engine in its “power band” at all rpms. This was actually a successful design; however, I blew two engines that week trying to dial it in, then finally had to call it quits when a part of the frame broke.

This year, we are running a supercharger on the bike. I have came up with a very clever design to create boost in a two stroke. Estimated horsepower with 5psi of boost is 40hp and with 10psi of boost is 50hp at 15,000rpm. We will be shooting for 120mph without any type of streamlining.

• For what class of racing was the bike built?

This bike was built for the 100cc land speed class minus streamlining. Next class would be partial streamlining such as found on a sport bike then after that is a full streamliner.

• What custom work/upgrades have been done?

Most of this is listed above however I will give a quick list…

• Custom ignition system that I program with laptop
• Aisin 300 supercharger
• Intercooler
• High rpm ported engine
• 20psi intake boost
• 60psi fuel system
• Honda CT90 front forks and fuel tank

Every single thing on this bike is custom built. Countless hours over years of research on late nights have been poured into this bike. I have done all the work from engineering, building the frame, building the engine, wiring, paint, etc.

As a side note, I think it is very important to create all motorcycles as art. They all need balance, flow, and composition and also need to stick out in peoples’ memories. This is easy to achieve on a custom bike but the challenge is to make this happen with a bike that has to actually be fast.

• Does the bike have a nickname?

“HOMEWRECKER.”

• Any idea of horsepower, weight, and/or performance numbers?

200 Pounds
40hp with 5 psi of boost
50hp with 10 psi of boost

• Can you tell us what it’s like to ride/race this bike?

Yes, I can tell you exactly how it is to ride this bike…I figured this out the other month as I caught a flight. Next time you fly on a commercial airline, as you get ready to take off, close your eyes and
just zone out. As the plane starts to go down the runway and pick up speed and the plane starts to shake like hell and makes that deep, dark rumbling sound that fills your ears as it pushes you back in your seat… That is exactly what it feels like to ride this bike down the salt.

• Anybody you’d like to thank?

Yes, very much so. I would like to thank my father, my grandpa, Elmer, and everyone else who has invested themselves into helping me with this bike. There are a lot of you and I want you all to know that it means the world to me.

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