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Originally Posted by Steve Weiner-Rennsport Systems
The only thing that dissolves all the built-up carbon and oil inside the ISV effectively is carburetor cleaner. Even brake cleaner doesn't cut it.
Get a can of that stuff and VERY thoroughly flush it out in both directions until it runs out nice and clear.
Steve once again you were spot on! I thought the thing was clean with Xenit until I sprayed the carb cleaner in there. It was running black for a couple of sprays so she is really clean now. Need to test the next couple of days.