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  1. M

    ok motor choice??

    I have a 1976 duranautic offshore 16 . Was told rated for 60 hp but I have acess to a 1977 70 hp to replace my blown up 50 hp. Do you think it is ok to put this motor on this boat?? THe deal is too good to pass up on them motor. Please help as I would like to purchase the motor tomorrow. I...
  2. M

    ok motor size???

    I have a 1976 duranautic offshore 16 . Was told rated for 60 hp but I have acess to a 1977 70 hp to replace my blown up 50 hp. Do you think it is ok to put this motor on this boat?? THe deal is too good to pass up on them motor. Please help as I would like to purchase the motor tomorrow. I...
  3. M

    short or long shaft??

    I am looking to buy a 1977 merc 700 and don't know if it is a short or long shaft (20 inch transom on my boat), serial number is 4716625. anyone know?
  4. M

    should i buy this??

    I have acess to a 1977 mercury 700 (70 hp ) inline 3 cylinder. It was only test started when new and kept in inside storage since then. It is just dusty but looks new to me (no paint worn off the prop or lower unit/etc.) I know the guy selling it so i know this isn't a tall tale. It is like...
  5. M

    power trim

    i have 76 merc 500 mounted on my center console. i want to install a 77 merc 70 hp. can i use my existing power trim/ tilt with the 70?? it is the model with the trim motor and pump in the boat and the cylinders on the outside of swivel housing. the 70 has similar looking lift assists (pistons?)...
  6. M

    Motor Control Help.

    I Have A 16 Foot Center Console With A Mercury Outboard And Want To Purchase A 1998 Johnson 50 Hp To Install On The Boat. I Currently Have A Top Control Box Made By Ultraflex. The Johnson Is Coming With A Side Control Box. My Older Ultraflex Control Does Not Have A Trim/tilt Button Or Key In...
  7. M

    Any Good???

    I Have A Chance To Buy A 1977 Mercury 70 Hp Outboard. It Was Started Maybe Once When New And Never Installed On A Boat. The Paint Isn't Even Worn Off The Prop. It Was Part Of An Estate Sale And Has Been Kept In Indoor Storage For All These Years. I Need Advice On If I Should Buy This Is Or...
  8. M

    coverting to power trim

    I Have A 1976 Merc 500 That I Am Going To Replace With A 1977 Merc 70. The 70 Does Not Have Power Trim/tilt. My 50 Hp Does (i Have A Pump And Motor That Sits In Back Of Boat And Transfers Fluid Thru Lines To Motor. Can This System Be Adapted To The 70 Hp Motor ? (the Mounting Areas Look Similar...
  9. M

    rebuild time?

    I Took My 1976 Merc 500 To Dealer For Link And Synch To See If They Could Get Better Performance Out Of It. I Had Been Having Some Trouble Starting And Thought This Would Help, They Found Water Getting Into Bottom Cylinder So I Told Them To Go Further. They Pulled Power Head And Removed Exhaust...
  10. M

    merc 500 hard cold start

    I Have A 76 Merc 500, Rebuilt The Carbs, Flat Levels Set Perfectly, Issue Is When I Have To Start It Cold It Cranks For A Second And Coughs, Then I Have To Keep Cranking Starter, It Takes Many Times Of This Before I Can Get It To Fire Up And Idle. Choke Works Fine, Primer Bulb Gets Hard. Once...
  11. M

    See If Anyone Knows The Answer To This One?????

    so, i have a 76 merc 500 and have been chasing a bog. I had a slight bog when hitting the throttle that i couldn't remove by adjusting the idle mixture screws. . I adjusted floats and reinstalled carbs, bog still there. all of this testing has been done with motor running on muffs. what i...
  12. M

    checking fuel pump

    I have a 76 merc 500 and want to know if fuel pump is bad. it had fuel pump built into side of carb body with the little blue fuel inlet caps that say tillotson. i blew into the fuel inlet and can hear air rushing into carb until i raise float, then i can't blow anymore. my fuel line bulb get...
  13. M

    carb help?

    ok, my 76 500 is killing me. i pulled the carb because i had a bog when accelerating. adjusting the idle mixture screws made no difference to performance. after pulling carbs i found restriction in passage for idle mixture screw. cleared restriction and checked rest of carb, all checked out ok...
  14. M

    oil leak??

    does anyone know what may be leaking oil from the top oif a 76 merc 500. i replaced the 2 rubber hoses on the side of the motor, behind switch box, but oil seems to be coming from under the flywheel. it is running down the engine and dripping out from lower cowling of engine. is there a top seal...
  15. M

    tach??

    I have a 76 500 and got tach to work again (bad rectifier) . it is off by 500 rpm or so, seems to be reading too high. the tach is a aqua meter tach that reads to 6000 rpm, i believe from 76 also. i believe i have at least 6 wires on back of tach. is there a newer tach i can use with this type...
  16. M

    flat spot???

    i have a 76 merc 500, have a bog when acclerating from dead stop also from any throttle setting under acceleration. idle is good, starting is excellent. i tried adjusting mixture screws on front of carbs , doesn't seem to make any difference. in fact i could hardly tell any difference from...
  17. M

    Tilt Lock Pin?????

    I Noticed On My 76 Merc 500 That My Tile Pin Is Rusty. I Am Talking About The Pin That You Swivel When Motor Is Tilted Up For Trailering. This Pin Swivels Down By Hand To Take The Weight Of The Motor Against The Bracket. My Pin Is Rusted In Center And Is Bent Out Of Shape. Looks Like It Is Going...
  18. M

    Fuel Coming Out Of Carbs??

    I Noticed When My 76 Merc 500 Is Tilted Up I Am Getting Fuel Coming Out Of The Carbs . It Is Soaking In Front Of Carbs And Dripping On Carbs Themselves, Worse When Trailering. What Gives???????
  19. M

    Carb Question

    I Have A 76 Merc 500, Took It Out Today For First Time Since I Bought It Last Month. Motor Runs Great, Idles Fine, Starts Fine, Has Good Power. My Question Is There Is A Bog When I Acclerate. The Bog Is Not There When Revving Engine In Neutral. It Is There From A Dead Stop And When Hitting...
  20. M

    Tach Question

    I Have A 76 Merc 500 And The Tach Is Not Working Properly. The Tach Won't Read Above 3000 Rpm, But It Works Ok From 1000 To 3000. I Assume The Motor Is Revving Higher Than This Because When I Give It Full Throttle It Seems To Go Into Its Powerband And Plane The Boat. Boat Is A 16 Foot...
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