OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Chainsaws and Concrete Cutters Petrol Chainsaws and Concrete Cutters Zenoah Chainsaw Won't Start. Help!

mustang, I suggest you focus on cleaning the pressed in jet, without damaging it. That job on carburetors is conventionally done by getting one of these sets of stainless steel oxy torch tip cleaners:


Find the largest rod that will go through the jet, and see if it will push through. If not, start a bit smaller. When you get the plain part on the beginning through the jet, push it through further and work the beaded part back and forth through the jet. Then squirt some carb cleaner through, followed by some compressed air to blow the carb cleaner out. Do not expect any other solvent to work: use carb cleaner to remove that gum.

If you just can't get any of the tip cleaners through, the last available measure is this one (shown on a Honda mower idle jet):


The tool is called a pin vice, and you use it to hold a jet drill. They can be bought in various sizes, down to 0.3 mm. The worthwhile ones are made from High Speed Steel, and they are used by touching them lightly against the center of the jet, holding the vice steady with an index finger on the octagonal part, and twirling the vice clockwise with the other fingers. Of course it is just as happy to drill through the jet, or the carburetor body, or a nearby piece of cast iron, as through the soft gum, so considerable delicacy is needed to use this approach. I normally use them to drill out jets as part of carburetor development, but I have been known to use the tiniest one on a Honda idle jet when necessary.