We had the thing running without the air filter all day yesterday, we just added it on today. Without the filter it got too much air, despite any adjustments made to the carb, and stalled out after only a short time. The only way it would stay running for longer than 30 seconds was restricting the intake with my thumb or duct tape.
How do I do a finger plug compression check? And by rings do you mean piston rings? Thank you very much for your help.