Ithangyou Ian, like the idea of paring out the air filter hose to fit if unable to get a reducing collar in there. Hoping to get the carb up in the lathe to skim down to suit the manifold. A bit too much to take of by hand unless you are really desperate.
As for jets the carb came with two spare main & ditto pilot jets as part of the deal, for fine tuning.
Looking forward to give it a go. Regards.