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  1. 1

    oil pressure switch hookup

    I recently purchased an aftermarket oil pressure switch for my 2002 4.3 mercruiser part #87-864252A01. The old unit has two wires purple (alternator/harness} and purple/yellow fuel pump, electric choke, starter. The new switch has a red and a black wire. How do I know which one goes where...
  2. 1

    replace Mercarb on 4.3 with Rochester?

    I have had continued problems with the original Mercarb 2 bbl on my 2002 4.3. I see a refurbished Rochester replacement on ebay for this application. Has anybody gone this route? I see it says minor fuel line modifications may be needed. Thanks for any help you can offer on this.
  3. 1

    4.3 fuel problem?

    I have a 2002 4.3 I/O carb model. Go to the marina start it up runs perfect at idle through full throttle. Shut it off on the lake for 2 or 3 hours. Start it up it idles for roughly 5 seconds then stalls. Won't restart. Pour a little gas in the carb it starts and runs for a couple of...
  4. 1

    4.3 set timing?

    I have a 2002 4.3 mercruiser carb in a trophy. Whenever I shut it off it runs on. If I let it idle a few minutes it doesnt do it. There are no timing marks on the front of the engine. How do I adjust the timing and do you think thats the problem? Thanks for any help.
  5. 1

    4.3 mercruiser fuel leak?

    I have a 2002 4.3 mercruiser carb engine. Replaced the electric fuel pump. Started the boat up and after a minute gas started dripping out of the electrical connection. How is this possible? Took it apart put it back together and no leaks. A couple of days later started it again same thing. I...
  6. 1

    4.3 running hot on one side

    I have a 2002 trophy with a 4.3 mercruiser. Runs great and always did till now. Half way thru the summer I powered it up to get on plane and it overheated. Alarm went off temp 200+. Shut it down and went in on the kicker motor. Replaced the thermostat. Ran it a little still threatened to...
  7. 1

    V8 Mercruiser with no top end power

    I purchased a boating project last year. It is a 24 ft four winns vista. It had a MCM260 V8 engine that turned out to be no good. I purchased a brand new crate motor from Michigan Motorz which was an exact replacement. I added a new ignition system. Set the timing with a digital gauge...
  8. 1

    Mercruiser outdrive compatability?

    I got a 1980 V8 outdrive with a hole in the top cover (assume MR1) and a 1986 V8 outdrive with a square top cover (assume Alpha 1). Neither outdrives have a serial number would they be interchangeable? Thanks.
  9. 1

    Brand new 5.7 runs poorly

    I have an 86 Four Winns boat that I just installed a brand new 5.7 Mercruiser motor in over the winter. It starts and runs at idle perfectly. It won't rev up very well and when under load runs very poor. I can go around 1500 rpms with no problem but slightly above that it "coughs" every...
  10. 1

    85 HP wont start no gas flow

    I've got a 1975 85hp evinrude that won't start on it's own. I take the plugs out and squirt some gas in each cyl and it will run for a few seconds then quit. I pulled the fuel line off the pump and turn it over, nothing comes out. Also turns over very hard sometimes don't know if this could...
  11. 1

    Shifting Boat out of the Water?

    From what I've read so far it seems that it won't harm my boat motor or outdrive to shift it into forward and reverse while it is idleing on a hose. I just had to rewire my shift assist switch because I installed a new motor and new ignition system. I would like to test it before I put it back...
  12. 1

    Fernco Fittings on Exhaust?

    I have a unique exhaust arrangement and would like to use Fernco rubber pipe fittings on my y pipe connections. I wonder if anybody has done this with success. The usual fittings are just rubber also and it's a wet exhaust. Just looking for some input. Thanks.
  13. 1

    Boat Leaking Help Please!

    I bought an 86 4 wins 245 Vista last year and did extensive work to it over the winter including a new motor. I had the outdrive off changed the gear oil and impeller and reinstalled it with a new gasket. The bellows all look good. I also installed new water flappers in the upper y pipe. I just...
  14. 1

    Fuel Gauge/Sender Issue

    Got an 86 Four Winns 245 Vista w/80 gallon fuel tank. I drained all the gas out this winter as the boat had been sitting a few years. Put in 20 gallons fresh gas the gauge reads empty. Actually a hair above empty. When I turn the ignition key on the gauge drops below the empty mark...
  15. 1

    Buffing the old boat

    I purchased an 86 four winns boat and it was quite highly oxidized it had been sitting for the past 5 years untouched. I started buffing with 3M perfect it and a low speed buffer. It came out real nice and shiny. I found part way through that Turtle wax rubbing compound works just as well for...
  16. 1

    Starting Motor without Outdrive

    I just installed a brand new 5.7 motor in my boat and was wondering if it would do any harm to start it up for a couple of seconds. I don't have the outdrive installed and do not want to run any water through it this time of year. I'm just want to see if it runs so I can save some time in the...
  17. 1

    Surge Brake Cap Leaks

    I just got a used boat trailer with surge brakes. Never had em before so it's a new experience. The reservoir was empty so I filled it up and bled the brakes. It's an older trailer (86) and I think somebody converted it to disc brakes. They seem to work fine now but I'm getting leaking fluid...
  18. 1

    Gas Tank Antiflow Back Valve

    I pulled the fuel line off my boat between the water separater and the tank. There's an little fitting just before the tank with a steel ball in it. I'm sure this is supposed to keep the fuel from flowing back into the tank thus aiding in faster starts. My question is when I try to suck...
  19. 1

    New 5.7 distributor installation

    Let me start by saying I purchased an 86 boat with a 5.7 mercruiser that was not running. After going over it there was no spark. I tested the old Thunderbolt ignition system and after determining that the box was bad I didn't want to put alot of money in the old system so I bought a new Delco...
  20. 1

    Hot Water Heater

    I just purchased a boat with shore power, etc. but it doesn't have hot water just cold. I'd like to install an electric heater just wondering what your experiences have been. I see small units that are instant and larger units like the 6 gallon atwood that are not instant. I'm going to mount...
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