I am in the process of building my first motorized bike. I have over $1300 invested in the build and that does not include the bike itself. My question is, what would you do different on your first build knowing now, what you didn't then?
1. Do not drill through the frame for the front mount, when I bought my first kit that's the way the front of the engine was mounted.
2. Do not use rubber in the mounts, it will cause a loose engine when it squeezes out.
3. Do not use the 410 chain, replace it with either 415H or 41.
4. Install a inline fuel filter.
There are more but these are the most important.