Ken Elenbaas wrote:There is no spring tenion screw on the side of the carb.
Hi, Ken - sorry about the delay on this.
The lack of an idle mixture screw is no surprise. Many modern carbs don't have one. EPA regulations have led many carb manufacturers to dispense with any adjustable components on their carbs.
You still have an idle circuit, though. Did you see the tiny holes in the carb throat? Those are the idle circuit.
I don't think that the carb is completely one piece, is it? You should have a bowl bolt at the bottom of the carb holding the bowl on. Go ahead and remove that (gas will pour out of the bolt hole as you do so, so be ready to catch it). Once you have the bowl off, you should see a thick tube from the carb body dipping down into the bowl.
Look up in that tube, and you will see a brass screw. That's the main jet. I recommend not
removing the main jet at this time, since you're best off removing that with an aluminum screwdriver to prevent damaging the brass. It's pretty important not to damage that. Just spray carb cleaner up into the main jet to clean it out. Be careful not to spray the rubber bowl gasket with carb cleaner when you do that.
Somewhere on the underside of the main body of the carb (the part you removed the bowl from), you may see a small round disc of metal embedded into the carb body. That will mostly cover your idle circuit inlet. You can spray carb cleaner into the open slit in the base of that disk and it may clean out the idle circuit.
Another way to try to clean the idle circuit is to spray carb cleaner into those little holes in the carb throat. This is less effective than spraying from inside the carb, but sometimes its your only option.
Let me know how its going.