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  • 79cc Motorized Bicycle From Scratch

    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 engi...see more »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.

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  • 79cc Motorized Bicycle From Scratch

    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 ...see more »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 bui...see more »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.

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