Posted by John Sellers on December 28, 2010 at 18:55:27 from (71.62.247.33):
I recently rebuilt an OH160 Techumseh for a Wheel Horse. I cleaned and rebuilt the carburetor, which is a Walbro. I double-checked to make sure that the float level was correct. However, when the engine is running, the carburetor will blow raw fuel back out of the carburetor. I had a theory that the intake valve was not seated properly and that compression was blowing fuel back out of the carburetor. I removed the intake pipe from the head and sprayed PB blaster in on the valve to check for leakage down into the cylinder on top of the piston (I used PB because of the liquid color would be easier to identify on top of the piston. However, I noticed no leakage by the intake valve at all. Keep in mind that the engine is in time. Is this an actual problem with the carburetor, or could the valve not be seating properly during operation causing leakage of compression by the valve?
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