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We did warm it up...took off and inspected lower unit and still nothing out of ordinary. I do know its a 2+2 and yeh its weird but the other 2 cylinders kick on around the 1900 or so RPM's...so still not sure what could be causing this. Afraid of the power head teardown.

So we did a compression test, got 137/137/135/135 top to bottom cylinders. Pulled lower unit to check...don't seem to be any issues there as well...

Here is a link to a movie a made of the engine...seems to sound worse that in person but here it is... https://www.dropbox.com/s/a2gl4c11oxcn78r/IMG_3139.MOV?dl=0

So any help would be greatly appreciated! Was out on the lake the other day, running across the channel at about 45mph with the engine at 4500-5000 rpms. All of a sudden the engine just dies! Thought I might have hit the safety lanyard and pulled the kill switch?! Started back up right away...

Hey Eric not sure if you'd be interested but I have a mint humminbird 798 hd unit I got late last year. Paid $1100 for but got new 998 for bday so it has bare use and in mint condition. Would sell for reasonable price if interested. Jeff

Finally weather gave a chance to check this problem again... I added the clamp as suggested but no good, took boat out and when trailering a lot of oil leaked again all inside bottom cowl and on back of transom... Not cool and looks like doing this for a while as back transom is discolored where...

I noticed a lot of the oil in the bottom of the engine well. Motor is usually tilted down when stored. I did drive it back from storage yesterday with the motor tilted. Kinda very annoying as fairly messy...