Just ordered one of the above,thanks again everyone for the advice .

It's best to keep her upright when warming up.
I was told by a longstanding Duc owner that it's an oil thing, you starve the clutch side of the engine.
Use minimum revs 1000 max; it takes 2 min for the oil to fully reach the rockers on the top cylinder head!
Less revs = less initial wear, you have the lumpiest cams on a Duc and these wear the rockers more.
The 748r is a lot harder to warm up than a bip as the lightened flywheel struggles to keep the engine turning over.
I've had a 2002 r for the last 2 years and have worked out some of its idiosyncrasies.

Thanks for that , makes alot of sense.