99 mercury force 75 hp not running right under load

mtfink91

Recruit
Joined
Oct 23, 2014
Messages
1
I have a 99 bass tracker pro 175 moth a mercury force 75 I am having problems with. This is my first boat and I'm completely new to working on boat motors. What's going on is when the boat is in the water and under a load it takes off mine on the hole shot then Bogs down and runs at about 2500 rpms full throttle and normally runs at 5300. In neutral it's starts up and runs fine and with boat muffs on it in the yard it runs great in nuetral and in gear. I have checked my compression I have 110 psi at all three cylinders. I'm stump could it be coil packs? Could it be fuel? Any help would be greatly appreciated thank you in advance
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,296
When you put it in gear running on muffs it really is still in nuetral as the prop does not need to do any work.----Test for spark and it must jump a gap of 3/8" or better on all cylinders.
 
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