Joined in 2023 
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Affordability: We believe that premium quality should be accessible to all, so we offer competitive prices without compromising on the performance and durability of our frames. The steering yokes (at least I think that's what they are called. The bits that the forks are mounted to) are cut from 6mm steel using an angle grinder / plasma cutter and drilled per the plans (1" hole for the forks. 16mm hole for the steering bolt. The distance between the yokes should be 160mm + enough space to add a couple of washers or bushing, In my case I added 8mm. (I think the plans show it a bit tighter). Attach the pump to the tyre valve. The hose head can be switched between Shrader and Presta valves easily. final drive. 3/4" parallel shaft to match the engine): https://www.geminikarts.co.uk/product/218355a-tav... 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.
So, before deciding what mini pump to buy, you’ll need to think about a number of factors. How much will it inflate your tyre per pump? How lightweight is it? How easy can you stash it away or mount it to your bike frame? And how durable and versatile is the pump head? Does My Bike Have Presta or Schrader Valves? Cut the 1M axle in half and remove burs at the end that would prevent it sliding into the bearing cleanly. 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). 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 !The only small engines available were lawn mower engines. Usually about 1 1/2 hp. flat head engines.
Grease up the axle good n' proper. If it tarts corroding you'll never be able to take it apart again. Bend the pieces shown in the plans using a 3" CLR die. The digital level comes in to ensure both sides of the symmetrical 'U' shape pieces are straight. As you can see from the pics, mine didn't turn out totally level because I didn't take enough care. That said, it was possible to fiddle things later on to make them line up better. Drill some seats for the grub screws on the wheel bearings to grip onto. Without this, the axle will likely move about and also, the screws will mark the shaft meaning you'll most likely never be able to remove it againLike the Cykeway, it comes with ‘Presta’ and ‘Schrader’ valve attachments, meaning it is great for either road or mountain bikes, and its bike frame mount means it can be attached securely to your bike and will be held firmly in place, with being overly heavy so as to weigh you and your bicycle down. WARNING: Since a lot of this was learning on the job, the photos/steps are not perfect. That said I'll make every effort to include enough information in the text for you to be successful. I also reverse-engineered some rough plans and a CAD model of the frame which should help! 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.
It also comes with a gas needle to inflate the sports balls, a fixed belt and holder to attach the pump on the bike, a rubber binding strap to fix the tube, a puncture repair kit and user manual.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. I delivered local newspapers on my Duddel Bug for a year. Until I was able to buy a "REA:L" motorcycle with my earnings. I still smile from ear to ear as I think of that machine. I had made it myself, and I was proud as punch of it. It was my first major project, and gave me confidence in myself that I could make some cool things. Rather than just dreaming about them. The WIY Mini Bike Frames from MiniBikeKartel.com are designed to elevate your drifting experience in every way.
The setup with the wheels on live axles etc allowed me the flexibility to use those huge wheels which look great. It added a lot of additional work above sourcing some wheels that have disks already attached to the hub or even drum brakes inside. Here in the UK its hard to buy stuff like that but in U.S / Australia there seem to be many more things like that for sale. Failing that please comment on the thread and I will be more than happy to answer questions for all of you.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, The 6.5HP and CVT transmission is great for an experienced rider who likes playing with the front wheel coming up into the air. For novices this thing is a bit frightening. I need to have a look at how to soften the power deliver a bit. 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. Manufacturer: As you’ll probably glean from this list, minibikes can vary pretty significantly in terms of price, and much of this is owed to the marque badged on the tank. The larger more reputable manufacturers tend to utilize more premium materials and generally offer a higher quality product with superior performance and reliability. Likewise, the major motorcycle manufacturers tend to offer more robust and comprehensive factory warranties, along with better dealer and support networks. You are admittedly paying a bit of a premium for the more reputable name, though the higher MSRP, in this case, does get you an objectively better machine. I was hesitating doing a write-up as I was sort-of learning/winging it as I went along since this my first build. It was also the first time bending tubing (which is something I've been meaning to figure out how to do for a long time!). Anyway the bike turned out great and is an absolute hoot to ride so I thought I'd go ahead and do an Instructables.
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