On my '07 iron-lung, I've adjusted the clutch once, at about 500 miles. Haven't touched it in the last 8500... (stil looking for the "fingers crossed" thing). Shifts fine, no clutch slip. I've been using a half-quart of 10w40 in the primary (usually) but switched to ATF after removing the electric start. Seems to work even better, but that may be due to cleaning the clutch discs in ATF when I had the primary off...
Mike and Stumpy in Michigan