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!

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!

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....

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.

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

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

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

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!

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!

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.

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

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 want to explain to the viewers something that many of you didn't see but is very important. I have been building motorized bicycles for years. Why did the Chinese engine come assembled but the BBR engines came dis-assembled. What is very important to understand is the "BBR" engine when built wasn't originally disassembled. With BikeBerry They sell a BBR engine, what is it really? It's a stock china doll with a supposed "upgraded jap bearing" they give you the piston, wrist pin, retaining clips, piston rings, cylinder and head all separate for you to assemble. I have the rookie experience of removing the jug, not understanding how to put the piston rings on, compress them and put the jug on. I did break piston rings and retaining clips. Now, lets say I am a complete noob. I buy the BikeBerry engine and probably do what? Watch their BikeBerry youtube videos, in which none of them talk about how to assemble the top end. So they sell the top end disassembled knowing that most will mess up either by bending a retaining clip, inserting it incorrectly such as not at the 12 o clock position, breaking a piston ring putting it over the piston, dropping a retaining clip in the crank case, then not compressing the rings where the pins are on the piston, trying to force the jug on not knowing how to lubricate the jug, compress the rings, how to put in the retaining clips etc. So, lets assume the noob does all the expected mistakes, because I sure as hell did not know how to assemble a top end for months. Now, what is the conspiracy? While it isn't suspicious that they sell bike parts, I do find it rather convenient that they sell all the parts that will more than likely get broken by the rookie. They sell stock china dolls disassembled knowing that you will break things and you do what? You come back to do business to buy the very parts you broke. A stock engine kit, just buying one as a normal customer costs what? $120 max? So they buy their kits by the palates, let's say they get them at $90 a pop. This so-called "Japanese bearing" costs maybe what buying one? $20-$25? They buy hundreds and the cost is lowered. Let's say overall cost for the kit and this upgraded bearing maybe costs them what? $130? Not only do they make money by saying these kits are "BBR" which leads people to think it's a brand, but it's not. It's a stock china doll with a Bike Berry sticker, there are no brands or manufacturers. There are only two factories that produce these, one makes Grubbe engines and the other one makes every single stock china doll. This is why your BBR engine used to come with the A80 A100 manual, because it's the stock china doll dressed up to be more than what it is. In a nutshell, I believe BikeBerry sells disassembled top ends knowing that you will break things and then they make money knowing you'll be back to buy retaining rings and piston rings.

Sean, I love all your videos but I really like this style video. It’s cool watching your antics trying to beat Craig. Please keep these coming. God bless you all.

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.

I had one of these as a teen. It was the “80 cc” (66 stamped on the side) and it lasted me years. I rode that thing everywhere and wide open throttle the entire time. Mine lasted for what seemed like an eternity. I ended up trading it for a pit bike and the guys I traded to rode it for years after that. If you mix the gas and oil properly and do regular maintenance, they last forever. The fact they sat on a trailer revving with no air flow on the cylinders, which have fins specifically designed for airflow, is what caused them to fail. Still cool video though. It was like a gateway to me riding motorcycles as an adult. I would recommend to anybody to build one of these. They are so cool.

"Watch out! Watch yourself! And your family I'm coming!" Me* 😂😂😂