2011 250 XS issue on hose muffs

[gambler1]

2011 250 XS ser.#1B861905 torquemaster lower unit
Here is my issue, Drop the boat in the lake and motor pisses at idle and 15-20 water pressure at wot and runs fine all day with no problems.
if I am at home and put in on the hose no water will come out off telltale pisser. All I see is temp rise on smartcraft gauge.
I’ve even tried taping off the 4 port front water pickup and still no change. But if I submerge lower in a tub of water all is fine. What is going on? My buddy has a 2012 same motor and his does it to. Do I have something failing or am I Ok?

[Savage]

You have a water leak(s) at the muffs/low water pick-up, or you don't have sufficient flow from the garden hose.........Its that simple.

[gambler1]

Hmmm that simple?

[Savage]

Yep.....I've connected muffs to a motor thousands of times.

[EuropeanAM]

Yep.....I've connected muffs to a motor thousands of times.

Yes sir- with adequate water volume, PIN-STYLE Mercury or Quicksilver Water Supply muffs, and either the low water pickup BRA-COVER (or other suitable cover), there should be no problem achieving IDLE water pressure and flow.

[gambler1]

Thanks, Another question I have is what would the maximum safe temperature of engine be while attached to the “flusher muffs” at idle? In other words what is considered hot?

[Bryanmc57]

With my motor on muffs, the temp cycles at the same temps as it does on the lake.

[Savage]

Temperatures should cycle between 120-130

[EuropeanAM]

Normally we start raising our eyebrows at temps that exceed 145 degrees. With normal/appropriate water supply, they just don't get that high on this engine series unless something is wrong.