Originally Posted by Sunstreaker
Can't see it on initial inspection, will need to see of I can find some more pics or diagram.
No. 25 on the diagram. Some engines have an airbox with an access hole covered by a plastic cap, some don't. Turn it in till it lightly seats then turn it out 1 1/2 turns.
Carb may need cleaning again if its been sat with fuel in for 4 months. You can't drain these carbs without removing them.
One thing you could try is raising the fuel tank so that its level or above the top of the engine, if this improves running then its likely to need a fuel pump diapraghm.