First thing I would suggest is to turn her over on the starter to check that nothing is clanging away or fouling. Getting oil pressure through to the top end is very important so wind it for a while and check by looking through the rocker cover cap. I took the plugs out so it had no compression to fight and hadn't refitted the fuel line at that point.

I let mine idle and warm up...

just as well - as the rear crank seal failed and a puddle of oil warned me to switch off. 4 - 5 furtive hours later with the box out, clutch refitted etc. I got her going and gave her light revs initially. It was a nervous smelly moment what with everything bedding in and new paint burning off etc.

I have no idea if this was correct but caution appeared to pay off.

Anyone else??

Andy