Well, the whole idea here is to keep costs down, the car is called a LoCost, and bike engines aren't cheap. You can go to an automotive salvage yard like Pick-N-Pull, there's at least 2 in every major city, and get any complete engine you like for under $300. If you're really good at searching Craig'sList, you can find running donor cars for $300. Nowhere in Utah nor Idaho is there a Pick-N-Pull for motorcycles, not Harley, not Japanese. But PNP-style yards, full of cars, we have at least 8 that I personally have visited. And many more yards that won't let you pull parts yourself, but will sell you engines cheap. If you want 120-ish HP, a bullet-bike engine may peak there at 15,000 RPM, which will wear it out in about 4 hours, and sound annoying doing it, or a Honda VTec will do the same while doing around 40 MPG, and you certainly must figure fuel consumption into how much any given engine will ultimately cost you. Bike engines don't bolt up to automotive transmissions, and bike transmissions are for 500# bikes, not 1500# cars. Car transmissions are for 3000# cars. That's 6 times the safety factor, for a very small weight penalty. A car engine peaking at 120 HP will have much more average HP, and will run at least 200,000 miles. Never even heard of one single bullet bike engine making it to 100,000 miles, but I have heard of some cars making it past 350,000 miles. I have one going in my LoCost that is over 300,000 miles, never rebuilt, not smoking. Guys who can fix car engines are a dime a dozen. But if your bike engine breaks down, it's gonna cost you, a LOT! Likewise getting parts, auto parts stores might carry a few Harley maintenance things, but that's about it. Now, everyone try to give adequate reasons to choose one. Ultimately, it comes down to what you want, and if you're dead set on it, noone will talk you out of trying it. But now you have been warned.
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