I Bought the Cheapest and Most Expensive Motorized Bike kits from Amazon

The fact that this guy built bikes for wallmart makes a lot of sense. Now I know what the kind of person that installs a fork backwards on a wallmart bike looks like.

Had one of these in high school. I tuned and polished the ports, and sanded down the jug for higher compression. It was an absolute riot and weighed in at only around 50lbs, so it would do about 35mph on the straight. Wouldn't want to go much faster than that on bicycle tires and a single tiny disk brake, but I loved it!

When I was 13, I built a 16" motorised bike with a 31cc 2 stroke whipper snipper motor. That was driven via a machined shaft onto the rear tyre. Would do 63km/h (Australia) and then..... went N2O injection with some creative engineering and could get up around the 80km/h mark. Looking back that was nuts.

keep in mind that the engines require the cold air running over them (from the bike's movement) to cool themselves. They likely could have lasted significantly longer on the road

I had one of these in college and rode them all around campus! It was AWESOME! I learned so much about 2 strokes and Carbs (I am a Software Engineer so no school on these) I even re balanced the crank shaft! These things are so fun!

That durability test was wack. These are actually pretty reliable engines. I've put quite A few miles on my last one and the piston still looked brand new before I sold it. You guys ran HALF the amount of oil you should be running for break in, that failure is clearly from heat... the piston got too hot and the high rpms broke the molten piston... Disconnect the radiator on a brand new KTM and you'll get the same result....

As a bigger guy myself, I think I have to finally point out the obvious size/weight difference between Sean and Craig when it comes to these head to head battles. Sean needs to be wearing a backpack full of ballast to even the scores! Big guys unite!! Thanks for the laughs guys!

I built one of these kits three years ago. I got a steel cylinder jug and high compression head with a real crank case and piston kit from Bicycle Motor Works in Pennsylvania. It took me two months to build the bike and make it a "look-a-like" 1910 Indian. I've taken it to shows and won a few trophies and such... runs out at 48mph (scary for what is actually a bicycle) and is super fun to cruise around on. I have well over 500 miles on it and sill enjoy riding it all the time. - these bikes can be a he'll of a lot of fun!

Durability test could've been better. Engines broke bc they weren't being cooled.

I’m 13 and I have the same cheap motor kit from Amazon on my bike currently, I have learned so much off of these little engines it’s insane and it’s my gateway into motorcycles in general and I have 243 miles on it so far and more to come. There awesome motors for people getting into engines or just trying to have a little fun just make sure you research a lot about them or they will break faster than they can ship from china

The fact that the cheapest motor stayed on the frame with only one motor was a shock! You normally have to check the tightness of the mounts because of the vibration from the engine. I've had a 2 stroke fly from between my legs this way. Be safe y'all!

Crazy thing is that's exactly what my job is right now as a Contractor building bikes at multiple Walmarts! Up to about 25 to 35 a day and it's the most lucrative thing I've ever done and I love it!

I have built several of those bikes. I actually went through 3 engines on one bike. But, set up properly, I did get over 2000 miles out of one of the engines. Not at full throttle, I kept my top speed to 20 mph. There is one part on those bike kits that will kill you, and that is the clamp on chain tensioner with the little plastic pulley for the motor chain. I had one get sucked into the rear wheel once, it destroyed the wheel, locked it up, and I crashed hard, onto concrete. I was riding in a bike lane, and was fortunate enough to crash to the right, onto the sidewalk, instead of to the left into traffic, where I would have been crushed by cars. NEVER use those things. You can get tensioners that mount to the motor. And that rag joint rear sprocket is junk as well. No possible way to keep it centered. You can get a clamshell rear sprocket mount that clamps to the rear wheel hub. You absolutely HAVE to have a front brake with these things. The coaster brake on a Walmart bike is completely worthless.

One reason I love mopeds, is because they are still true to the original motorcycles. Simple engine with one gear, and pedal cranks... WHAT YOU WANT IS A WHIZZER.

You’d be surprised, I bought a little 80cc 2 stroke china choo choo engine for 150$ and ran it 40/1 and got probably about 1500 miles out of it before the piston ring snapped and seized the motor. I had it on a 700c road bike frame so it had pretty good top speed. About 38 miles an hour. I ran it about 10 hours a day maybe 100 miles a day. Did Uber eat deliveries on it. It was basically a pk80 clone 👍🏻

And I'm back! I can watch your videos over and over. lol. Funny fact. I also assembled bikes here in Canada for places like Canadian Tire and Walmart. My buddy owns a company that does that sort of thing and I needed the extra money back then. Always a SUPER confined space we had to work in. Hope all is well with and your family Sean!

The fact that Sean’s came stock with maxxis tires is insane 😂

Fuel to oil ratio should be 16:1 for the first two tanks and 20:1 after the break-in. I've built and sold 21 of these bikes in the last two summers

I've had mine for 14 years wit no issues! Take your time building these !

I LOVE the color of Sean's bike! I generally don't like greens, but that deep blue-green is beautiful! That bike at the end is gorgeous!