Anyone with DIY motorized bike experience? Considering building one!

purpuraRana
2023-07-08T02:11:49Z

Hi Tildes!
I'm a college student considering adding a gas motor onto my existing bike. I'm in a pretty hilly city, so biking around for groceries is kinda annoying... plus I wanna just zoom around some trails in my free time.
Currently, I'm looking at one of the 49cc 4 stroke engine kits all over Amazon/Ebay, since I heard that 4 stroke motors are supposedly quieter and more reliable than 2 strokes. I don't care about speed... in fact, I don't want to be going over 30mph on a bike. 49cc also makes this thing street legal in my state.
I did consider doing an e-bike conversion as well, but those are much more expensive... a 4 stroke kit is ~$160, while any reputable e-bike battery alone is more than that. These things don't burn much gasoline either, getting 100-150 mpg! I'd have to ride thousands of miles before the fuel cost exceeds an e-bike battery.
So, any advice would be appreciated! Also, I'd be willing to spend ~300 on this if there is a compelling reason to get a better motor than the generic Ebay one. If you have motor suggestions, please link them!
Thanks,
purpuraRana

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