Woke the boat up from winter storage and ran (225 1998)on muffs 2 weeks ago for approx 10-15 minutes no problem (Came up to 140 F usual for this motor at idle). The boat was launched this weekend so I ran it in the slip (Saturday) at idle again for 10-15 minutes fine. Sunday I went to go out so I ran it 5-10 minutes to warm up and proceeded out. After a few minutes at idle the temp rose to 160 (normal running temp) but kept going toward 180 F) and no water was coming out of the tell-tale. I shut it down and idled back to the slip on 1 motor. At the slip I found a blockage at the tell-tale. I cleaned it and flushed the system checking the T-stats water blow off valve no other blockages evident. Ran it again at fast idle for a while and got up to temp and held it. Impellors were replaced in the winter. Any ideas on what is going on?
