I just rode to work on my newly upgraded C88 and while it has not turned this little machine into a crotch rocket, I have to say it does make a decent improvement in the overall performance of the bike. A hair quicker off the line, definitely pulls stronger, and a noticeable improvement in holding speed on moderate grades. I used the Dr. ATV 88cc kit, and overall found it to be a very easy changeover. In all, I'd say it took around 7 hours start to finish, but I split it over xmas eve and some of xmas day. The carb will take some additional re-jetting and I'm hoping a 5mm Keihin jet is a 5mm Keihin jet. There is something so satisfying and simple about these bikes that really belies the first glance. The minimal amount of tools required to do anything is a remarkable feat of engineering. Anyway that's my success story. Will follow up when I re-jet it again.