Nice clean build! Since your already setup, and looks like its rideable I would love to hear what you think of the HS50's driveablilty before and after the conversion. That size bike you have with the large rear tire would be a pretty good test on how much, if any, loss you get on the low end with the lighter flywheel. I've have converted a few but when I did it they were either on bikes I never rode with anything else on them or just built and sold the engines. I would also keep an eye out for an actual HS50 exhaust pipe. They dont choke down at the flange like that HS40 one on there does. The earlier ones actually match the port really well and seal up good. Not a big deal but every little bit helps!