2008 25hp 4-stroke less power when "hot"?

targetpanic

Seaman
Joined
Jul 25, 2008
Messages
70
Hi all,
I have a Merc 25hp EFI 4-stroke. I have noticed that when I start it up first thing in the morning , then go trolling for 6 or so hours, when I go to WOT the motor doesn't seem to have as much power. For example I took my wife and son fishing yesterday. The motor is underpowered for the boat due to HP restrictions. We launched and the boat went right up on plane and reached max rpm. We trolled around for about 6 hrs, when we picked up the rods and I opened it up to head back in, I coulb BARELY reach 4800-5000rpm. I have noticed this numerous times this year when there is a load in the boat. Is this normal????
 
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