Throwback Thursday: 8 Old School Rides from Pinkbike Staff - Pinkbike

I've been looking to make a mini-bike for ages now and finally got round to it. For a while i was collecting ideas on my Pinterest board yohr. It was also the first time bending tubing which is something I've been bioe to figure out how to do for a long Build Your Own Mini Bike Frame Design bui,d Anyway the bike turned out great and is an absolute hoot to ride so I thought I'd go ahead and do an Instructables.

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! Failing that please comment on the thread and I will be more than happy to answer questions for all of you.

A brake calliper and lever master cylinder like this one. NOTE: I'm pretty sure this is identical but the listing for my one no longer exists as I osn the brakes off my drift trike.

This is a very popular engine design used in everything from compressors, generators, log splitters, go karts builr even wake-board cable winches.

There is also a smaller sibling the GX which would be fine too. The GX is meant to be roughly 6. What's also nice about these is that they build your own mini bike frame 7.1 mechanically very simple and self-contained i. Pull start is also a plus.

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. This setup means my minibike shoots off from a standing start like absolute stink and will pull power wheelies from a walking pace with a firm fistful of throttle.

Nice Cons: Expensive. Some maintenance to consider as the belt is consumable all will need replacing after a period. The unit is also quite wide fra,e the bike a fatter, and slightly lopsided look. If the cons don't put you off go for it remember to get the smallest drive minni you can and a pitch to suit your chain.

In my case 10T Pitch. If I find the time, I'll make a video comparing the two to help you choose. If you don't fancy a torque converter, a traditional centrifugal clutch bkild this one will work fine. A note on gearing: I set the bike up to top out at about 30MPH. I calculated this using the wheel diameter 19"the rear sprocket teeth 60the bime sprocket teeth bbike and the builf RPM of the engine to give me 33MPH. If you are trying different ratios you can use a speed calculator like this if you can't be bothered dong the maths yourself:.

The ratio I have here is probably the highest you can achieve as the 60T rear sprocket is the largest I saw for sale anywhere online at least in a pitch. Some builds I have seen use a Jackshaft to further increase build your own mini bike frame 7.1 gear ratio but I think this is a bit overt the top and makes the bile look messy.

So this build your own mini bike frame 7.1 was a little bit trial and error minl 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. After I finished the frame, I measured things and sketched up some pwn plans see the files section for the PDF.

I later modified these to allow the axle to be removed more easily without needing to disassemble it which is always a pain in the a Just cut from the edge of the cutout hole as shown. You can see bi,e of the mistakes I made and how to avoid them when yur come to build.

In summary, the rear chain stay far too short and I had to mount the bearing carrier bjke the way off the back of the tube and then bik with some 6mm plate. This looks a bit messy and the whole build will be cleaner if that tube is longer and the carrier just welds on underneath.

The plans Biie have included with this Instructable have a longer chain stay so this should be OK. Please check for yourself. I had to move the build your own mini bike frame 7.1 really far forward to try and Build Your Own Mini Bike Frame 10 avoid chain slap against the chainstay given the angle of the chain. This meant relying on only 3 out of the 4 engine mount bolt holes yuck! See if you can do better when you build your own mini bike frame 7.1 the engine.

Maybe a chain tensioner wheel? I'm not sure if the large size of the rear sprocket adds to the problem with the angle but with a bit of fiddling about you might be able to do better than I did. I would guess yours will be the same. Build your own mini bike frame 7.1 worry about the precision on the width too much.

Just make sure the fork legs are the same on both sides. The steering yokes at least I think that's what they are called. I think the plans show it a bit tighter. The headstock is made out of a mm piece of 1" tubing mounted onto the frame at degrees to the top tube. Given the fat tyres, the bike is stable but doesn't turn very tightly. I tacked the tube on roughly, adjusted the angle then welded on.

Per the plans I added some reinforcement on either side with a bit of 6mm steel plate. Note: I made a couple of brass bushes on the lathe for the headstock to make a nice tight fit for the steering bolt. Without access frqme a lathe, I'd recommend getting 2x 1" bits of mild steel round bar as tight a fit as you can get to the Build Your Own Mini Bike Frame 3d ID of the 1" headstock tube, drilling the 12mm mlni through it, pressing frzme and then tack welding it in place while the bolt is through the holes just incase of any movement.

That build your own mini bike frame 7.1 work just fine. NOTE: making these build your own mini bike frame 7.1 scratch proved to be quite time-consuming!

There must be some of these on eBay and will save you a fair bit of grief. This worked O. Build your own mini bike frame 7.1 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. For the brake disk carrier, I decided to turn out of a solid piece of aluminium. This was simpler in many ways and guaranteed the disk would run true also. I think id use this method again next time I might also remake the sprocket carrier at some point.

So I first started off thinking the owwn build your own mini bike frame 7.1 be on the front wheel as that's where the majority owh stopping power comes from on a 2-wheeler but after playing around with the fit-up, I decided that it just looked too messy having the brake sticking out on the side like that. The back wheel setup gave me some more room to play with and, from riding the bike a few times now, this is plenty of build your own mini bike frame 7.1 for a bike that size anyway.

Especially as there is just sooo much tyre making contact with the ground. As you can see by the result this was a mimi of a 'bodge-up' as they say in the U. K, but works great. I have included a template for a cutout for the brake calliper that would trame a frsme way to do it.

This was way more fiddly than i thought it was going to be! I buil a test ride with a straight through pipe shown but this was just ridiculously loud. The whole idea is that people can play on this all day without the neighbours getting the hump so a plan 'B' was needed.

In the end I repurposed the original exhaust muffler and made a custom header out of the 1" pipe I had lying around. I started from a full deg bend and cut pieces with a hacksaw to build your own mini bike frame 7.1 the shape I needed.

It worked out pretty well and is quite enough. You get a noticeable drop in performance though as the bike definitely doesn't wheelie as aggressively fame the new exhaust but its a decent 71. Im really happy how this worked out and its been great fun to build. The keyway hubs on those wheels rattle about a bit although they can't move anywhere because they're wedged in nice and tightly with spacers.

I might try a shim or two or just accept that this is biike home-made rig and builld expect the ride quality of a BMW GS. Question 2 months ago on Step A simple start question: - Initial reference is made to 1in tube. This latter would seem to me to be the better size. Am I right? Reply 2 months ago. This is literally the thing that has been occupying my mind for ages now. You have unfortunately confirmed alot of my research, which is 'how the heck do you get atv style wheels with drive and brakes without a live axle?

I came to the same conclusion about live axles. Great build, I hope to make one soon! I think an ATC front bime would look good,just search on ebay. Reply 10 months ago.

Hi Mate, thanks for osn comments. Fframe bike's being used daily around the fields and rides great, Being on those fat tyres is a laugh and absorbs the rough terrain really nicely. While its a bit of a bodge, the live axle has settled down and is working well Better solution always sought so pls share if you come across anything.

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