How do you remove the knobs off the dash

Pry them up. There's a gap between the knob and escutcheon. Under the knob there's a small nut and washer. Take these out and the switch comes out under the panel. Hope this helps.

Just finished servicing my HS35. The choke knob has a screw that needs to be removed which is under the lever part of the knob and screws into the choke linkage shaft. The fuel valve is removed by pulling up on it and turning it from on to off until two plastic tabs under the control panel align with notches in the frame. Do not force, it will come straight up. The electronic off-on-off knob is attached to the panel and does not need to be removed. Hope this helps.