I've been doing some "search" reading on the topic of flywheel weights and what I would like to find out is a couple things. First--- What, if any, would be the difference I would feel between the 10.5 & 12oz. weight? And for that matter, would a 14oz. make any difference? Second--- What type of weight (drill & Tap vs. Rivet) is better for the long turm. (any balance problems on the crank?) I have an 01-YZ426 that has a bone stock motor with a spark arrester, headlight with lighting coil. I might play around with the jetting a bit for the different elevations I'll be riding in but that is about all. The type of riding I will be doing is mostly trail & long distance cross country. ---------------- 01-YZ426 With an "Old Man" (46) hanging on.