Hi again guys thanks lemur for ur reply Iv replaced the full gasket kit which I got for £11 from eBay genuine Dellorto seals Im a little confused about the adjustment screws on the 305 both are on the left hand side of the bike 1 in the centre which iv looked and is the tick over that’s tapered at the end and hits the bottom of the slide to adjust its height all fine so far now here’s where my carb seems to differ from all pics I can find on the net and books manuals ect they all seem to have another screw I’m assuming a fuel screw to the left of the idle one close to the inlet side of the carb but mines is on the right hand side of the idle and closer to the air filter why is this and is it 2 1/4 turns out or 1 turn out as a starting point ?? Thanks again in advance for any help