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Should not be a problem for you, have certainly had 20 overheating alarms.
My experience says that you can get 2 Guardian behavior.
A small, drop the gas pedal which also gives cooling and then...

Debris in the T-stat can hold it open, causing low water pressure but then you would also see low engine temperature.

Spot on, running my pro xs up to 6450 ( same engine, different software ),

Rev limiter kicks in at 6450.

Have you tried to turn the prop while shifting?

Looking for Intimidator III (3-blade) 29" to 33" pitch.

Have the next generation (2016) ,also get -6 C in my display. From the manual "not available" for Oil Temp..

Have to use a smartcraft gauge/instrument.0,10,25 is set using a Smartcraft device.

My fault, it was 4 beeps.
Induced the Guardian twice in row today, the first time I had do drop the throttle, the second time I had to restart the engine.
Overheating the instrument tells me, this...

Thanks, added a 8M0089111 at the top of the engine , but saw a similar sensor a bit down on the right side making me believe water pressure is monitored by Guardian.
Got solid beep.
Has SC1000...

Mercury proxs 115 -16
sn: 2b229669

Could someone shed som light regarding the guardian system?
Coming from Yamaha SHO , Mercury is new to me.

Run the proxs with low water intake on a 20f...

Thanks, you guided me in the right direction. Did a Master Reset of the SC100 and then Set and Station-2 appeared.
SC100 v.2.01 SC1000 v7.0 and MercMonitor v5.01

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Mercury proxs 115 -16
sn: 2b229669
Has a digital trim sensor, would like to show correct trim on SC100. Also have a MercMonitor and SC1000 tach hooked up. After trim calibration of the 3 gauges...

Cooling diagram
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+1

+1

Do you mean that 2 holes on each side of every holes on the intake were filled or 2 rows or all holes?
If not all was filled, where there any difference on left or right side.
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I used mineral oil (mercury) during break-in. Google "Why mineral oil for break-in" .

Phase kit for SHO, what could that be?

Insufficient fuel could create overheating.Is your ECU flashed?

"I have no confidence in that gasket" (Seinfeld).
If you put on a new one , you have to tighten real hard , or retightening it after a while.

Maybe it's worth wait awhile
http://www.bbcboards.net/yamaha-motors-high-performance/610051-ecu-upgrade-250-sho-5.html#post6482554

Thanks,I will follow this thread and if Eric succeed to get rid of the flatness, I will send in my ECU for upgrade. Not so found of the idea to run 7000 rpm.

Strange to me, have a v-shaped boat and have come to the conclusion that I get the best performace if I prop for 5700 max , using a standard 250 SHO. Thought the 300 mapping shoud get rid of the...