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If the motor "leaks" down gradually, the tilt cylinder seal could be bad. If she falls down fast, there is something else wrong. Perhaps a bad manual release valve?

So it won't idle below 1200RPM and bogs above 4500RPM? Idle above 1200RPM would indicate some timing or throttle linkage issue. Bog above 4500RPM would indicate a fuel delivery issue. Bad running after bumping a rock would indicate a possible (possible) electrical issue, or more likely is...

If the PTT systems get air in them, the motors will run and the motor not tilt. So if you have the manual release closed, get someone to help you lift the motor, all the way up, while running the PTT motor in the UP direction. Locate the manual tilt lock (starboard side usually), and lock her...

Bass boats sometimes had a trolling motor or trim system switches in the bow. Are either of those a possibility?

You should pump the primer bulb when she slows down. If that fixes the issue you have some sore of fuel restriction or a weak fuel pump. Did you replace the VRO pump with anything?

The bottom spark plug is pretty clean. It should look like the others. Make sure it is getting spark and fuel from the carb. If you see beads of water on it, suspect the crank seal.

Just set the primary pickup and the max spark advance correctly. It doesn't matter where they are set now. If the set screw is all the way in or out, you have some other issue. The throttle stop is to prevent the stops on the carbs from being bent, when the driver slams the throttle forward...

The lowest screw on the throttle arm is likely the idle stop (speed) screw. Primary pickup screw is usually just above the pivot point of the throttle arm. You need to figure out which screw is throttle stop and which is max spark advance screw. Max spark advance should stop trigger from...

Gee, if you are working on a motor that old, you need the correct service manual, a not many shops will work on it. The throttle arms changed a bit, but not that much since being introduced in the 1976-1980 model year or earlier. You should be able to figure it out with careful observation...

Gee a Bass boat (typical) would fly with a 200HP motor. A prop efficiency calculator would tell you that you have massive slip.. My boat similar to a bass boat runs 60+ with a 135HP Merc and a 21 pitch prop. You have another issue.

Looks like you need to know if your motor is 2 cycle or 4 cycle. That prop is not avail on that web site, but if you get the right hub number, it is avail on other sites. https://www.boatpropellerwarehouse.com/category/5509/26-pitch Mercury 135-400HP Outboards 135-400HP Outboards...

A 26P prop is a little higher in pitch than most of the props sold. However, I do not expect that you would have trouble determining that it will fit your motor and getting the right hub. Are you using the prop wizard for the Trophy prop you want?

Doubtful. You probably need the swivel bracket assembly that matches that transom clamp, as you see the tilt rod needs a pin in the center of the swivel bracket.. Then the question is whether your steering arm and rod would fit into that swivel bracket assembly, and whether the yoke is the...

MerCruiser wiring diagrams will be available in service manuals. Boat wiring diagrams are not avail for particular boats, but a lot of OEMs follow standard wiring colors. Gauges are only made by a few. maybe you can match something up. Other than that, match up what else you need. A lot of...

You are missing the coil. It bolts to the three thin screws in the block directly below the distributor cap. The rotor is non-removeable and $200+ to replace if you do the work. The cap is also $200+, but they last a long time. The spark plug wire conductors are stranded stainless steel...

How about new gear oil, grease steering, propshaft and tilt, replace fuel.

Those plastic carb bowls can warp. See if that is the issue. A straight edge will make it obvious.

What about latex indoor-outdoor carpet mastic? It holds carpet real well in my boat, in all kinds of wet, hot and cold weather.

What about contact cement? You could ask Weldwood if they think it a good application. You can get gallons and use a brush.

As Racerone says. You can make your own. You should have the old wiring harness colors. So, red is battery positive, Black is battery Neg., choke is grey. Ign power is white, Starter solenoid is yellow, tach sender is brown, Ign killer wire is salmon or orange.