There's a workshop manual excerpt free download which covers the G2 and G3 carbies HERE in Section 4.

If your carby has a plastic governor vane, it's a G3; if the all metal one, it's the much rarer G2.

Check the snorkel for obstructions too; it should run the same with snorkel but no filter, as with snorkel disconnected.

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."