@NormK,
Will do - it puts out noticeable smoke puffs when you throttle up, so start up, if you slow the engine and then get back to cutting revs, hit a thick patch of grass etc. But there seems to be a slight amount of smoke even when in normal usage But I will check and report back.
As luck would have it the handebars broke at the point where they're screwed on, so as to be able to fold down for transportation - has broken there before and I'd added an extra steel backing plate and welded - but will have to weld again.
So will likely not be able to test until this weekend but much thanks for the replies.
