Vapor is all that is found in the intake manifold. Thus not really possible. Manifold issues can happen but they are rare. Common issues are cracks to the outside letting air in diluting the mixture so much that it doesn"t run. Loose manifold nuts allowing the same air leak into the head at the flange. These two can be pretty easy to find bu looking carefully at the casting for cracks, and if someone helps by cranking the engine while a (unlit) propane torch is directed to the head to manifold area to feed in fuel with the air leak. The third manifold issue is internal between the exhaust heat to intake joint and can be a crack that is hidden letting exhaust enter the intake. not common but possible. I think that holding your hand over the intake at the carb while it is being cranked to start (be careful to be in neutral with the clutch blocked down to reduce drag on the engine) If powerful suction is found, or it starts, the choke plate might not be centered in th intake bore. If poor suction, the manifold could be cracked as described, or the valve timing could be off. If no joy, spark should be checked on each plug making sure the spark is crisp and blue, not yellow and thready. If good, a compression check is next. All these tests require a good charged battery and fair to strong cranking speed. Pull starting it is another good option if you and another person are adept at the process and careful. Be safe. Jim
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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