I've got a GXH50 and I want to put it on my bicycle. There are two things that are a concern to me. 1. My bike has 21 speeds and I'm worried this might interfere with a chain drive. Will it? Chain drives sound preferable to friction drives, so I'd rather use a chain. 2. I need to buy a mounting kit, but I'm worried the ones I have found may not be ideal. My mechanic swears that Chinese steel is almost always poor quality, and I can only find kits that are of Chinese make. Can anyone comment on this? Agree/disagree? Here are the two that I'm looking at. 49cc Mounting Kit Only - $219.99 49cc Chain Drive 4 Cycle OHC Rear Mount Gas Motorized Bicycle Kit | All Gas Powered Bicycle Motors | Live Fast Motors - Gas Motorized Bicycles and Gas Powered Bicycle Motors Edit: The second one includes an engine, so you can disregard it. I might ask them to sell me the chain drive only though. Advice is much appreciated! Thanks!