Quote:
Originally Posted by Steve762us
...with these motors, is it possible to have *too much pressure* on the hose, supplying the coolant water flow---to the point it could back up thru exhaust to the cylinders?
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Not possible, unless you have a clog in your exhaust... but then the engine wouldn't run at all.
How was the engine oriented when you were flushing? Was it tilted more than 10 to 15 degrees from vertical? Carbs are sensitive to orientation... tilt too much and they starve for fuel (since the float keeps the needle valve closed).