Joined in 2023 
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63 About this deal
If you don't fancy a torque converter, a traditional centrifugal clutch like this one will work fine. The only small engines available were lawn mower engines. Usually about 1 1/2 hp. flat head engines.
Attach the pump to the tyre valve. The hose head can be switched between Shrader and Presta valves easily. Im really happy how this worked out and its been great fun to build. The project is quite forgiving for the beginner welder/tube bender so don't be put off by what looks like quite complex stuff. Fit the tank - I found some runner door stops that made the perfect petrol tank mount. All that was required was to weld on a metal rod for them to slot over. Not a great picture but you can see all this on the picture of the frame sprayed.So this bit was a little bit trial and error for me as I've only just managed to get my hands on a tube bender and this is my first time using it. I started getting up and running following the excellent tutorials from The Fabricator Series on YouTube.
Unmatched Performance: Experience immediate and precise response as you maneuver through corners and turns with ease. The only changes I see today in the basic Duddel bug design is, the advancement in engine horsepower by almost 4 times (!), with over head valve engines. And the addition of a transmission. This improvement resulting in a 35mph top speed carrying an adult, and the machine now being wheelie capable ! What’s more, one can thoroughly upgrade a minibike with aftermarket parts for a fraction of what it would cost to build-out a big-bore moto project. And while it is a somewhat niche scene, there are thriving minibike racing leagues scattered across America (and the rest of the world), giving riders a taste of racing without the exorbitant overhead costs that typically come with two-wheeled competition (not to mention a markedly lower chance of injury).This worked O.K but there is a bit of run-out (wobble) in the disk as there is practically no way of keeping the pieces totally still while welding. The heat tends to move things about, A note on torque converters. These are the same transmission as you would get on a modern scooter like a Vespa GTS. It's basically an automatic transmission without discrete gear changes that uses a rubber drive belt (also known as a CVT for Constatnt Variable Transmission). With these, the engine reaches the optimum RPM range almost instantly and stays there until reving-out at the top end. This way you have maximum torque throughout the speed range. Stability and Durability: These frames offer the ideal combination of stability and durability, ensuring a smooth and secure drift even during the most daring maneuvers. The first step was to figure out the parameters of my tube bender and you will have to fo the same for yours. In essence, this consists of doing a 90deg test bend (as explained in detail on the video series linked above), marking 1" gradations and marking the bend at 10 deg increments until you hit 90 deg. That gave me the Cost of Material (COM) =4.5" for my setup so I knew how much metal to use and where to mark it out. Following my marks too closely won't be exact for your setup so I really suggest understanding the principles before setting off. Spend a decent amount of time ensuring that the wheel is running true with the frame. I didn't have a scientific way of doing this so I just eyeballed it + used a meter rule to help see angles vs. the frame. Bash true with a wooden mallet if necessary.
Durability: Our Mini Bike Frames are built to withstand the rigors of drifting, offering you countless hours of exhilarating fun without worrying about wear and tear. Cut the 1M axle in half and remove burs at the end that would prevent it sliding into the bearing cleanly.Grease up the axle good n' proper. If it tarts corroding you'll never be able to take it apart again. The rights to return your items will not arise if the item/s have been used, damaged, modified or broken. This statement does not affect your statutory rights. Spray the frame. I used a bog-standard rattle can (Hammerite smooth / rust-oleum). Seems to look OK.
In true OpenSource style, the design of my bike here is based on a bunch of ideas I've seen online remixed with my own twists which hopefully someone else can take and remix+share. Bikes tend to come with a Presta valve or a Schrader valve, with Schrader valves being the most common. The easiest way to spot the difference between the two is that Presta valves are made almost entirely from metal, while over half of a Schrader valve is wrapped in rubber. Portable Bike PumpsAfter I finished the frame, I measured things and sketched up some rough plans (see the files section for the PDF).
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