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  1. M

    Omc 5.0 revs before fully engaging into gear

    Hey guys I have a omc 5.0 litre inboard. The shifting seems out of whack. I’m trying to get my idle right down to ensure a nice shift into fwd or reverse. For the most part fwd gear is a smooth transition. As for going into reverse not so much. The revs come up before the the reverse is in gear...
  2. M

    1989 four wins omc 5.0 stalling (iso wiring diagram)

    I’m having some stalling issues in my motor, runs for about 2 min then chokes out. There’s 1.6 volts on the ornge wire when the motor is running. I’m sure it should be atleast battery voltage there. Anybody have a valid schematic for this setup thanks.
  3. M

    1990 four wins omc 5.0 keeps stalling

    Had the boat out this wknd and ran into some stalling issues. Started the boat on the dock and it ran perfect, once it started to get warm it’s stalled out. Went to turn the key and it turned over longer than usual, finally fired back up. Ran for a couple mins and had the rpms at like 2000 and...
  4. M

    mods for 5.0 omc engine?

    Hey all, i have a 20' 1990 four winns horizon 200. The thing has a omc cobra 5.0 for a heart. I love the boat, motor runs mint, can get about 42 mph out of it. My questions are in regards to doing mods to this boat. I have a vortec 350 in my shop i am going to rebuild this winter. I am wondering...
  5. M

    Water in oil treatment?

    I just picked up a boat for nothing and it has a Omc inboard and found water in the oil. I started to pump it out and pumped about 5 liters of water out before i got to the oil. My question is what can i pour into the engine and down the cylinders before i put new oil in it? I just wanna crank...
  6. M

    3.0 to 3.8 omc plz help

    I have a 3.0 omc engine thats blown and the boat has been left to sit. I recently got a parts boat with a 3.8. Just wondering whats involved to do the swap? Thanks everybody
  7. M

    thinking about buying a formula boat??? input needed

    hey guys, looking at a 1987 formula 20' open bow with a 360 hp engine. 560 hours and everything looks really well taken care of. I live in northern canada and want something for fishing big lakes and also, speed and wakeboarding. How would this boat hold up? I am mechanically inclined but I am...
  8. M

    1989 celebrity 19 SE......LOOKING AT BUYING

    Hello, I am looking at a 1989 celebrity 19 se with a 5.7 liter Mercruiser for 4 grand obo with a stainless prop . I live in Northern Canada and the boat is in Northern US. I am in the process of getting as much info from the owner and more pics. Anything I should look at or watch out for with...
  9. M

    What year is my johnson seahorse 18?

    Hello. I have a johnson seahorse 18. The serial number is 328455 and the model number is fd-15f. Just wondering what yr so i can order some tuneup parts... the motor had no spark and found out it had 2 cracked coils. Anyone know anything about this engine? Points gap ect... Thanks
  10. M

    power trim doesnt keep motor up for more than half hour

    I have a 1972 merc 80hp with power trim. 2 pressure lines and 2 return lines. I put my motor up and after about 30 min it will lose all its pressure and fall down. Any ideas why its losing pressure? it isnt leaking oil anywhere .... where would i get parts ?? thanks
  11. M

    Please help!!!! Early 70's Merc 80hp a lemon!!!

    Hey guys, just wanted to say that I am extremely frustrated right now. I restored my 15ft boat which took me a year and a half. I purchased a I believe a 1972 Merc 80 hp with a thunderbolt ignition. When I took the boat out the first time it was exciting because it had taken me so long but the...
  12. M

    Motor runs awsome except when I open it up!!

    Hello, I bought a 1970 Mercury 80 hp last year and I had just used it for the first time this week because I was finishing my boat. I had started the motor up on the stand, idled it, revved it up and check to see if it went into forward and reverse..... everything ran perfect!! I put the motor...
  13. M

    Max capacity on trailer tires?

    Hello, I have a 14.5ft fiberglass boat with an 80hp Merc ( approx 235lbs). I am not what the total weight of my boat is. My concern is that my tires are rated for 780lbs a side, how can I determine if these tires will be too small for my boat trailer? I was thinking of upgrading to the bigger...
  14. M

    Lower End dry as a bone!!!! Help!!

    Hey guys, I have a 1970 Mercury 80hp Thunderbolt and I went to do some TLC to the motor today before I use it for the first time. I went to drain the bottom end oil and there wasn't a drop of oil that came out. I filled it up and topped it up abd I havent seen any oil dripping from it yet but I...
  15. M

    1970 Mercury 800 Thunderbolt water pump question?

    Hey guys, I have a 1970 Merc 800 Thunderbolt and I started it up for the first time since I bought it and did not see any water spitting out above the waterline. I had the engine on a stand using ear muffs, I didn't run the motor long at all, I am hoping that the water pressure didn't get high...
  16. M

    How to wet sand Interlux Perfection satin black?

    Hey guys, I sprayed my final coat of Interlux Perfection jet black on the bottom of my boat. I flattened the black to satin for a dull finish and it looks awsome. I finished spraying outside and while it was still tacky my boat got raided with dandy lion fluff which cured into the paint. My...
  17. M

    Painting a satin black with Interlux Perfection

    Hey guys, I am about to paint my 14 ft tri hull this weekend and just have a few quick questions before I do. I was going to do the roll and tip method to paint my boat outside and go for a satin black finish. The mixture is 1 part poly paint and 1 part flattening agent to get a satin finish. I...
  18. M

    Mercontrol all buggered up

    Hey guys, i just bought a Thunderbolt Merc 800. I got the controls with it, choke button on top and idler on the right. Everything works but the throttle seems loose. Reverse has no slack but when i put the throttle into forward it wil pull the throttle cable a little bit, have tons of slack and...
  19. M

    Thinning Interlux perfection??

    Hey guys, I am about to paint my 15 boat with Interlux Perfection Jet Black Top side paint. I am spraying the Interprotect Primkote on and then im going to roll and tip the black on. I did not order Interlux thinner/reduce and will need to use some, my question is if I can use any reducer or...
  20. M

    Transom Help!!!!!

    Hey guys, I had just redone my transom this past fall when i got my boat. The marine plywood itself was solid but when the last person had changed it they had butchered the outer skin on the backend of the boat. I had redone the fiberglass and body work on the backend with 5 or 6 layers of...
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