Zenith 36IV Accelerator Pump Ball Valve

Hi All. In process of trying to refurb a Zenith 36IV (idle hands and all that...). Seems ok in there -a bit gunged up but one thing has me stumped. The accelerator pump ball valve seems to be rattling around but I can't figure out how to get to it. I've taken out the piston (little plastic rod) but can't access the ball valve. Anyone know how to get at the little sod! Cheers, Lard

Its just accessed from belo, it sits on a spring. Just strip the carb fully and it will be obvious. Dont forget to lap the carb and soak it in carb cleaner overnight.

Thanks. I did give it a good washout with cleaner but I'll leave it soaking for 24 hours and see what happens......