If the valves are not closing that either means you have poorly adjusted tappet gaps, burnt valves or carbon build up on them. None these are really the result of a manifold gasket.
And the weak point of the gasket is not between the exhaust and intake ports, that is actually their strong point. The bolts are in between these ports and most of the clamping force is here. It would be more likely that the gasket would leak from the top and bottom. Meaning that they would suck air on the intake and then it make the engine idle high, and he would have noticed this when he sprayed carb cleaner around the manifold.
And there is really now way if it could happen , but if exhaust gasses where somehow making there way over and into the intake port it would cause the engine to run rich and the plugs may appear a little wet when he took them out. But then engine runs just fine when you put a little exhaust gas back into the intake , as in the whole principle of EGR. Exhasut gasses are recirculated into the intake to lower combustion chamber temps in an effort to hold off detonation allows further timing advancement, equalling more power and better fuel economy.
If you look at your manifold on your 140 you will see what I am talking about when I say it is almost impossible for the manifold to leak exhaust gasses across the manifold gasket area.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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