Initially I thought I might have to remove the carb and disassemble it to clean it out, but the information I found told me that the bottom bolt on the fuel bowl was also the main jet for metering the flow of fuel. Since removing the carb from this machine looked like a bit of a chore, I decided to try cleaning the main jet first. I used a tiny drill bit which was just the right size, and moved it in and out of the orifice by hand (it was NOT attached to a drill). This cleaned out the orifice quite well and removed all of the crud that was restricting the fuel flow.

It all makes perfect sense. The engine only ran when the choke was on (which reduces the amount of air mixing with the gasoline). With the clogged jet, the air/fuel mixture was too lean when the choke was open because it could not pass enough fuel. After cleaning, the right amount of fuel was flowing again and the mixture was back to the proper amount of air and fuel with the choke open.

Hope that clears it up for ya.

Jon
“The Right Guy To Call”