With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
Tell us about yourself!
High Quality Shuriken (Throwing Stars)
Ultra-Durable Foam Archery Target
79cc Motorized Bicycle From Scratch
The golden eagle mount kit might be fine for smaller engines, but it looks a little flimsy to hold up to a larger engine. Also you would probably have to modify it a lot to get it to accept a predator engine, enough that it would probably be more work than just making one from scratch. Also $375 is a lot of money for just a mounting kit. You could buy all the metal and tools you'd need to build one from scratch for less. You can really get away with using only a drill and a handheld angle grinder with cutoff discs for mount fabrication, it won't look nice, but it will function fine. Also you can build the engine mount in a day easily, it takes me about 3 hours to put together an engine mount.Another thing I notice about the golden eagle mounting kit is that it has a belt drive which attaches to the spokes. While this may be fine for sturdy wheels paired with a really small engine, the predator is powerful enough to rip the spokes out within the first 100 miles. Remember we are talking about an engine that is easily 4 times more powerful than any of the golden eagle engines. Also doing a rear mount for a larger engine is going to significantly raise your center of gravity and make it a lot easier to lose control.Another thing is that using the golden eagle kit, I have no idea what gear ratio the kit has, it might be completely wrong for a predator engine.Also IMO golden eagle is really overpriced, for the cost of some of their engines I could build a decent predator bike if I got lucky on craigslist; although there are some who swear by them as well. Make of that what you will.
I'm sending you a pm with my email.
OK, you clearly have some very good points, thank you for the long response. Starting to seriously consider this build... wish I had a workbench I could use for a week, but my current renting situation won't allow that. But I think if I break this into a few different days of work, I should be able to manage. I'm hoping I'm not jumping in too deep on this one, still debating on maybe building a smaller 4 stroke setup first... but you are completely correct about the GEBE kit being pretty damn overpriced. I figure building the engine mount and bracket and getting it on the bike is going to be the hardest part (I hope)... tho also hoping the engine modifications are easy enough, your instructions seem clear enough, but I am no expert on engines. I'm thinking about picking up the engine at Harbor freight tomorrow, even if I end up building another kit first, would be good motivation to get this thing going (and thinking it probably makes sense to just build what I want the first time).I suppose the big step now is finding the right bike. There's a ton of used bikes here in the SF Bay Area luckily, but still seeing something that looks like it'll be a good fit (at least not getting any response from people with anything that looks good). But I will keep looking.Thanks again for all the info, hoping I can piece most of the parts this week, and start figuring out how I want to break up the work and tackle this.
Man, amazing write up, I am so tempted to try this... but TBH thinking I should maybe do an easier kit (or something closer to a kit build) my first go at motorizing a bicycle.Any recommendations on something a bit easier to get my feet wet... been thinking about maybe starting with a Grubee Aluminum frame (not sure on GTA or GTS yet). I definitely wanna build something with enough power to have some fun, but I'm only 160lbs and traveling on mostly flat land (tho there are some decent hills I'd also like to be able to do)... and would like to at least hit a solid 35mph, 40 would be nice. Is a kit a bad idea, where I should just get the parts separate? or are there some decent kits to get starting. I have an electrical engineering degree, and am good with my hands, but by no means an export on motors. Also don't mind spending in the 1k range (more if necessary) for my first go, tho I have a feeling I'll be building a second one very shortly after. Think the Grubee frame would be a good start? any recommendations on what to put on one? I'm hoping to build something like this on maybe my 3rd go (maybe my second if I get balsy), so think 2 steps down from the build you describe here.
BTW, your 'this' link is not a real link.
Thanks for the quick response. I'm now thinking about going with a Golden Eagle kit to get me started (they seem a little pricey, but also reliable and easy to build on a wide range of bikes)... then giving this a shot for my second build (I'm just worried about the time and space right now... I am renting, and while my landlord has a TON of tools and would help, sadly he's more into wood work than metal... I don't have a workspace I could take up for a week, let alone a few right now.What I am wondering is, if it would be possible, and if so how hard it would be, if I got the golden eagle mount kit (https://www.bikeengines.com/shop/mount-kit-only-without-the-engine-36-spoke-2/) and tried to attach the 79cc predator to it. I feel like that would be the ideal situation for my first build, with more than enough power... and would get my feet wet enough that this build would likely not seem too hard after doing.
Glad to see someone who might actually be interested in building one! So, first off, on the frame, it's an aluminum frame, which I don't like. Aluminum fatigues much faster than steel, leading to a broken frame rather quickly. The blue road bike that is in one of the intro pictures had an aluminum frame, which broke within a thousand miles. Also, if you buy a bare-bones frame with nothing else on it, expect to spend a LOT more on parts than if you just bought a craigslist bike and swapped out parts, especially if you need to have the shop build the bike for you.Second, on kit engines: I find that the Chinese 2 stroke kits are made as cheaply as possible, and contain many inferior parts that will require immediate replacing to get the bike running, and many more that will need to be replaced if you want to go more than 25 mph. For example, the stock sprocket that comes with the chinagirl engines attaches to your wheel by clamping onto the spokes. Not only does this provide no way of properly aligning the sprocket, but it will also quickly rip the spokes out of your wheel and pull it out of true. If you know a lot about 2 stroke engines, enjoy tinkering, and aren't looking for a reliable mode of transportation, but just something to have fun with, go ahead and get a 2 stroke kit for the first build. But know that if you want to hit anywhere near 35 or 40 mph, you will need to do a TON of engine modifications. I'm talking porting the engine, replacing and tuning the carb, welding your own exhaust pipe, and a bunch of other things. Also, unless you have a heavily modified and upgraded 2 stroke, you will have to choose between speed or hill climbing power. The engines simply aren't powerful enough to give you both.On my bikes: It looks harder than it is. Unlike the 2 stroke kits, the predator engines will start right out of the box, without any carb tuning or part replacement. The magneto will not die instantly if you get a bit of water on it. The spark plug boot and fuel line will not disintegrate in the sun. And, perhaps most importantly, I have provided you with extremely detailed instructions on how to build one. Also hitting 40 and still being able to climb most hills is easily within the grasp of the 79cc predator engine.Whatever you choose to build, I'd be happy to help you build it by answering questions, giving advice, and troubleshooting.The blue bike was my second build btw. My first was a 66cc 2 stroke kit. Black was my third, Red was the 4th.BTW, if you're wondering what would be a step up from the predator bikes... This is what I'm currently building.
High Capacity Easy Use Soap Dispenser Tank
I can't find the comment by nicolas that you're referring to. But I would like a contest that is specifically for smaller engines, I want to see people build motorized stuff. And have an excuse to build another motorized bicycle.
I think it reaches out to more people than a lot of the contests we have had lately. I'm talking about all the ones that pretty much require you to have stuff like 3D printers and other specialized equipment. Plenty of people love to tinker with small engines.
I would like to see a "small engines" contest. I would definitely enter in that one.
Where do I find this instructable. Also, I did end up making an instructable for my bike, here it is if you're interested: http://www.instructables.com/id/79cc-Motorized-Bicycle-From-Scratch/
This is awesome but i make a electric bycle chekout my instructable
check this my new creation electric bike
I use a single front disc brake with a 200mm rotor on my gas powered bicycle, which can do about 40. It is more than up to the task and I have never even needed to use the rear brake.
Mega Swampy: A large, economical swamp cooler powerful enough to cool multiple rooms!
I corrected you and then, after reading a bit more, became so confused by the wording of the laws that I was no longer sure if my correction was correct, so I deleted it.
I stand corrected. Throwing stars are illegal to carry concealed in Virginia. I was misinterpreting this section of the Virginia Code to mean POSSESSION -OR- Possession with INTENT TO SELL. One of those tricky codes that needs to be cleared up. Thanks to whomever it was that corrected me as I no longer see your comment.§ 18.2-311. Prohibiting the selling or having in possession blackjacks, etc.If any person sells or barters, or exhibits for sale or for barter, or gives or furnishes, or causes to be sold, bartered, given or furnished, or has in his possession, or under his control, with the intent of selling, bartering, giving or furnishing, any blackjack, brass or metal knucks, any disc of whatever configuration having at least two points or pointed blades which is designed to be thrown or propelled and which may be known as athrowing star or oriental dart, switchblade knife, ballistic knife as defined in § 18.2-307.1, or like weapons, such person is guilty of a Class 4 misdemeanor. The having in one's possession of any such weapon shall be prima facie evidence, except in the case of a conservator of the peace, of his intent to sell, barter, give or furnish the same. - jed.watkins
Don't people bring swords to Cosplay events? - ohoilett
Real weapons generally aren't allowed at cosplay events unless they are being used for combat demonstrations.
Actually, in Virginia, throwing stars are considered to be knives, and as such are legal to own, but not legal to conceal carry.
Join 2 million + to receive instant DIY inspiration in your inbox.
Download our apps!
© 2016 Autodesk, Inc.