fatfingers

What tool do I need to get the head off?

And how do I get to the low idle speed screw?

Cheers

jefx

All you need is the right size allen wrench to take the head off. Take off the black cap, there is 5 holes, the screws are down there. Careful if you take the head off, don't lose or bend the head shim(s). When you put it back on, tighten the screws a little at a time in a star pattern.

jefx

The low speed needle and the idle screw are two different things. The low speed needle is at the end of the slide. The idle screw is to the left of the high speed needle, on the back side, behind the air intake.