Lowbrow, I don't mind drilling or tapping the original flywheel so the S3 should be OK and I can get the S3 stuff in the states pretty easy. Thanks for the info.
Chris, you are spot on. It does have the black outer head and the insert under it is silver with the 30T on it so it must be a standard compression insert like you say.
I agree, it is one sweet bike. I marvel at how simple it is when I work on it compared to my big bore dirt bikes and I LOVE it's light weight.
I appreciate the information guys, I'll order the flywheel weight and insert later today and will report back when I get them installed.