I've been browsing these forums for a couple days. My friend got a Flying Horse kit on his bike and, needless to say, I loved riding around on it. I'm in high school in an engineering charter school and I would greatly prefer to build my own. I've been looking and I decided that it wouldn't be very difficult at all. Right now I have a 7.0HP lawn mower and a smaller weed whacker. I'm definitely a larger guy (~220lbs) and I was thinking that I should go for the lawn mower engine. Does anyone have any objections or any tips? If I use the lawn mower, I'd use bevel gears to transfer the power 'horizontally'. This combined with the lawn mower's throttle seems like it would make a good candidate. My main concern is that the lawn mower is overpowered and the weed whacker is underpowered.