On my STX, flushing with the hose connected to the factory fitting creates an air lock and prevents flow thru the head and a good flush (I run in the bay and need a good flush). This weekend I cut into the cooling line from the pump and flushed it that way and it worked great, head stayed cool and I was able to flush long enough to do some good. I will install fittings that will make it easy to flush this way from now on. I had cleaned all the water jacket cooling passages when I had the top end apart is why I am sure it is an air lock issue.
97 1100 STX flushing. Kaw plumbing su..s (does not work)
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