OK...did you try that little test? Another thing with these engines. The upper and lower crank case is held together with 9 ?? Bolts. Make sure all of them tight. They loosen and start to leak out of that paper thin gasket. Briggs found a simple fix......put some loctite on the stupid bolts! I prefer nail polish. Costs only a buck a bottle and the stuff holds really well. Another thing...try either NGK BPR6ES plugs or the NGK iridium plugs. They are BKR6EIX-11. Cost around $8.oo each local but go on Ebay You can find a box of four at around $16.oo. They are increadibly worth the cost. The engine will start before you can let go of the key. Don't forget a dab of copper never seize on the plug threads. Hope you change out that messed up carb. A new one will work so well I bet you will change out the other two machines. The first one I bought two years ago was 135 dollars and they now cost around 45 bucks. The parts kits cost more than that! Have fun!