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Four idle circuits all need to be just right. The secondaries need to be set first. The two idle ports within the secondaries need to be uncovered by adjusting their bottom of the carb adjustment...

13537 My bent rudder and hull damage cost around $5 K. Better then new structurally and new gelcoat by pro. in my case, I had a break through and leak.

Do your initial measurement at the battery. 12.7 volts is desirable for a fully charged battery with engine off.
Engine idling should increase voltage above 12.7 volts which indicates charging,...

Your problem fits the fuel line problem area. A full tank of gas is less work for the fuel pump. As the fuel level gets lower there is more strain on the delivery system. If the small separate source...

Things that are common to high RPM - Is the choke opening completely. A carb change may cause choke to flame arrestor mechanical interference. Ignition Coil and coil wire/ends. Low voltage on...

My PCM tranny didn't slip so I did not disasemble the clutch pack. The manual states that needle bearings are destroyed during disassembly of the clutch packs. I did not find a source for a full...

I have the same transmission. 89Mariah. My leak started from an overfilled transmission caused by a rudder area hull breach. Long story, almost sunk, happy ending.
Somehow water entered...

A thorough boat inspection is called a Marine Survey. Look on the internet for what is involved with a Basic Marine Survey which is a good starting point for a realistic assessment of a boat's...

Marine distributor Advance degrees @ 0-550 = 0; 750=4-6.5; 1000=9.5 degrees; 1500=11.5; 2000 RPM=13.5 degrees.

Try www.signspecialist.com Lots of fonts and colors.

The melted negative post is a clue. The area of high resistance is the connection/post area. You may need to repair the negative cable end terminal. The battery post and the cable connection point...

Other things to check when the intermediate circuit works and the idle circuit doesn't - Too much gas going in. When the engine dies, turn off ignition and look down primary and secondary throttle...

My experience with local has been great. Took my 51 amp alternator to a local guy and it was returned, tested, with no needed rebuild, and no charge. If you find a local starter shop they will have...

My 89 Mariah also has a Holley. When I first got it the new looking Holley carb would load-up and run rich. In my case I could see the secondaries dripping during idle on a warmed-up engine....

Web search to; Engines1.novosolutions.net I found a PCM_40_a_trans_man.pdf This manual was helpful.
My PCM transmission required a case seal replacement after it took on water. Long story.
If you...

To find a voltage drop area take several multimeter measurements. I work from the battery and outward.
Start at battery post to post for baseline. Two persons on these tests is safer. In your...

Growling noise might be transmission related. Check transmission fluid for signs of water. It should be translucent, not milky.

Steering cable was tight on my '89 Mariah. The label for its cable grease calls out 'Mercury 2-4-C which is a lube containing teflon. My steering was stiff but I was going for easier.
Rear zerk...

Neutral safety switch may be on the top of your transmission. I have an 89 Mariah and the switch was OK but my shift cable brass ends were worn,causing intermittent start problems.

Something you said in your post about water in the coolant, How old are your riser gaskets? Although they don't generally wear out they could cause air in the coolant. Any rust seepage on the outside...

My guess is that your carburetor is flooding your intake manifold, hence the WOT low RPM and the loss of idle. I found my secondarys were dripping fuel and needed to clean the float seat and lower...

Any boat left in the water may experience metal pitting. The stray electrical current causes damage. You need to consider a way to give the galvanic action a non-destructive path. Salt water needs...

On some of these boats there is a fresh air vent below the side window. On my 89 Mariah I removed it to provide additional visibility to the backside of the control.

My hat is off to you TitanTn,
My 89 Mariah winter project is not as aggressive as yours. I am also working in the basement on my boat. Mostly electrical and clean-up as previous owner was clearly...

You might want to check under the hull around the rudder mounting area. Gelcoat cracks that have let water in can cause rot that will need to be repaired. Grab the rudder and see if the hull is...