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Did correcting the wires fix your issue? I am having what sounds like the same issue, in neutral it runs a miss but I can tell it up to 5000 rpm if I wanted but under load it struggles to get to 3000 rpm spitting, sputtering and back fires but after awhile it will get on plane and I can trim out...

Okay put a scope to it and found three pieces, one rubber one aluminum and a steel rod. No other obstructions found. Just cooked the old thermostat and it didn't open all the way until 185 degrees. I'm going to start putting it all back together tomorrow and see what happens. Thanks and I will...

I will look at the hose to check for kink or obstruction. I have a scope now so I'm going to look for those pieces.thanks

Is there a way to pull the y pipe with the motor in still? I planned on doing a coolant flush on the block when I put it all back together. Currently everything is tore apart so I can find my issue. I hope it is a restriction issue and should have results from a leak down later today.

Thanks. I will be sure to look it over later.

This is a gen 1

I pulled the lower unit and changed the raw water pump already, the pump and impeller looked almost new with no cracking on the impleller and no wear marks on the housing. I pulled the upper portion of the out drive to look for the broken shutter. I flushed with water from the top of the y pipe...

I've never taken apart or researched exhaust belows, is it possible to do this with everything attached? Will I need to replace the belows?

I am haveing a similar problem. Please keep us updated and good luck.

I feel like I missed a big part of this thread. Was there an over heating issue caused by blockage in the exhaust from a broken water shutter?

Did you ever find out what was causing the issue?

lso the port side shutter was missing all of its rubber coating (they were aluminum covered in rubber style)

Could all my issues be caused by the half of the water shutter I can not seem to find? Could that half be restricting my exhaust flow and water flow from the starboard side manifold? With the out drive off and garden hose ran into the y pipe water comes mainly from the holes at the bottom of my...

Did you ever find the culprit?

3&5 both showed 150. Leak down test tomorrow to rule out head gasket 100% but my guess is not head gasket. No smoke, no moisture in oil, no signs of exhaust gas pressurizing cooling system.

Help be my head hurts. I have a 1990 Sea Ray 230 with a motor ( purchaced new and installed by a previous owner) 2001 marine power 5.7 efi closed loop fresh water cooled. I bought the boat k knowing it had a running issue. I took it to the lake the day I bought it to see what it was doing. It...