Join Date: Aug 2018
Location: Lowell area, MA
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You can use just a little splash of gas, or a spray of carb cleaner, or some other flammable spray, if you don't have starting fluid handy. I think some people have used WD40, but I've never tried that, not sure how flammable it is now.
If adding a separate fuel source (like starting fluid) lets it run briefly, that's great, then we know you have a fuel problem. But it could still be something else, like low compression, some sort of a valve problem, possibly something less-likely such as an ignition timing issue, etc.
As Matt1097 said, I would make sure that the main jet is clear, and isn't partially restricted due to corrosion, a piece of grit, etc. You can do things like running a copper wire strand through the jet to help make sure there't nothing blocking it.
If the testing points to a fuel problem, and cleaning doesn't help, then a new carb is definitely worth considering, if you can find one at a good price.