So no real surprises for oil build up and break in, good! Same as what I've done before.
Don't know what the engine has had for sure, it's at a local breakers, the guy's a lanny nut and got it ex ebay so whether it's had the list of parts that are shown on the accompanying invoice or not is anyones guess. It's looks to have had a freshen up, maybe a cam, can't remember. Need to look again and go into this with eyes wide shut I recon... good old ebay eh?
I'll have a look at the link suggested. Any more good sources for SU knowledge? Used to webers and down draught solexes...