Has anyone done a build with one of these Honda gx100's or some of the bigger displacement four strokes? It looks plausible given this Honda 100 only weighs 23 pounds.
You're right. I have a bike that uses the GX 100 clone. My Titan will out run it, but the Honda clone is great for pulling a trailer up hills. The biggest problem is running out of revs for top speed with reasonable gearing for take off. I can't complain though.....very dependable, and does a good job for me. Also, side by side, it doesn't look mych larger than the 50. I even had a couple of bike cops try it out. They weren't looking for speed, more quiet and tractability. They liked it.well, thats true honda's are 'spensive and I found it odd that it only put out 3 hp. It would probably have torque coming out of its ears though.
According to this calculator your engine is making http://http://www.me.psu.edu/lamancusa/ProdDiss/Bicycle/bikecalc.htm about 5hp.i love my home built 148cc flathead bike
youtube link since i dont have time to resize my pictures
YouTube - ducatiluke's Channel
got 94km/hr it a modified briggs and stratton vertical shaft mower engine
Let me know how I can help. I'm running a HF 79cc motor right now and it's awesome. Geared properly...