04-03-2020, 02:58 PM
Mike,
The engine will not rev without an air supply so if you are blocking the air intake to the carb it is getting in somewhere else. I think you have checked the manifold to engine and manifold to carb joints and not found a problem however I would try assembling these joints with silicon sealer as well as the gasket and see if there is an improvement.
The carb throttle and choke spindles can also leak but would have to be in a really bad state to cause the problem you are having but it may be worth putting some thick grease around them to see what happens
The engine will not rev without an air supply so if you are blocking the air intake to the carb it is getting in somewhere else. I think you have checked the manifold to engine and manifold to carb joints and not found a problem however I would try assembling these joints with silicon sealer as well as the gasket and see if there is an improvement.
The carb throttle and choke spindles can also leak but would have to be in a really bad state to cause the problem you are having but it may be worth putting some thick grease around them to see what happens