Thank you very much for the info. I'll have a read through

@ScottieJ - That's very kind. Thank you
I have the Haynes Manual but any further detail on the carb assembly would be hugely appreciated.

I’ve been getting a 1985 SJ410 back running after 10 static years. All going well until, to try and rectify a “bogging down” & very low power/torque issue, I removed the Carburettor and entirely stripped and cleaned it (mistake!). I used a repair kit to replace various bits and then put it back ...