looking for engine for bicycle.. NEW here.

I hope my China kit is that way now. I have gotten rid of the tensioner completely and the chain seems to finally be stabilized. The nubs have worn off those tires so it does rattle the chain any more. The engine has caused me very little problems since I got the installation correct. It's the *darn* chain that has been the most problem. I think I would rather go with a rear mount friction drive and just replace the tires. In my case speed isn't a factor but I have this kit now so it stays.

I think a rear engine bolt on kit based on a similar low priced engine would be the cat's meow.

*replacement word by the author

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What kind of budget? That's a consideration.

I think you will spend less on even the best quality frame mount 2 stroke than on a frame mount 4 stroke.

I have a frame mount 4 stroke with a Honda engine, and I love it...now that I have spent an awful lot of time getting it right. Believe it or not, a well sorted 2 stroke kit will be much easier and faster to install. I have done some non-standard things with mine and I absolutely love the engine, but it has taken quite a bit of custom work to get the thing to work well. Of course you would not need to do all I did, but some stuff I think just makes good sense.

Just as an example, plan on tossing out the nuts and bolts that come with the kit (including the engine mount studs)...after, you take examples down to the hardware store and get good quality nuts and bolts. Also, you may have to build you own throttle linkage and will probably want to disable the governor. Toss out the kill switch, get one from Radio Shack (and on, and on, and on....).

That being said, if you want to spend the money and want to fabricate, a Honda 49cc 4 stroke is tough to beat for reliability, smoothness and economy. I have a 48 tooth sprocket and cruising at 30 mph is not a problem. For hills, a 56 tooth will work better (keep in mind that you cannot compare sprocket sizes between different 4 stroke kits and 2 strokes kits as the engines and gearing are different, my comments are based on the Grubee Skayhawk II gearbox), but then the top speed will be a hair over 30 mph and cruising speed a little less- but with a one way trip of 4.5 miles, it's a time difference of under 2 minutes...actually, under 1 minute.

I am not trying to scare people off from the frame mount 4 stroke- far from, I think it is great- it demands mechanical chops of its owner, however.

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3 cubic inches of raw power.

I have ordered and built 5 frame mount china engine kits. I have only had problems with one kit thus far. I have not given up on it yet. These are some good kits and almost as fun to build as they are to ride. Good Luck.