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  1. J

    1988 Yamaha 90 hp Trouble

    Hello First off Motor was all rebuilt last year new piston rings carbs redone lower unit seals etc New 24 gallon fuel tank mounted on a BW montauk. I enjoyed a trouble free year last year work was completed by a very good local shop. Only used the boat twice this year in the water did not start...
  2. J

    1988 90 hp Yamaha Value

    Hello All Would anyone be able to tell me the approximate value of a 1988 90 hp Yamaha 2 stroke? Motor has new power trim pump motor new seals in lower end (Tested) new water Pump....Just trying to get a rough idea Thanks for your help...Runs Excellent Looks good. Original paint and decals
  3. J

    1988 Yamaha 90 HP Compression Numbers

    Hello, Can I please get some help identifying compression number on my 88 Yamaha 90 hp outboard. I just did a compression test with the motor warm and all plugs out. I got between 80 and 82 on all 3 cylinder. I understand that I am looking for all cylinders to be in the same range.My question...
  4. J

    2 Stroke Yamaha 90 ho Lower Unit

    Hello and Thanks in advance for your help I have a 1988 Yamaha 90 hp I changed the lower unit oil today. The oil that was inside looks very good not a sign of water at all. I pumped in almost one quart ( I let it drain for two hours) and plugged the top hole and added two short pumps of oil in...
  5. J

    1988 90 hp Yamaha Factory Service Manual

    Can anyone tell me where I can purchase an online factory service manual for this motor Thank you
  6. J

    90 hp Yamaha Power Trim

    Hello All, I have a 1988 90 hp Yamaha. The power trim unit is working but I have the normal corrosion on the motor which I have on order to replace. I have also seen some very small amount of fluid leaking.Can anyone tell me is there a rebuilding unit for this power trim? If not can anyone make...
  7. J

    40 HP Mercury Power Head

    I have a 40 hp Merc 2 cylinder early 80's. A friend of mine gave me a real nice very low hours power head that will fit my motor. Can someone tell me how much work I am looking at to make the switch? My motor is still running well but compression number on on the edge.I think I can take this...
  8. J

    13 Ft Boston Whaler Bow Eye

    Does anyone know have to repair the eye hook that pulls your boat up on the trailer? mine has movement side to side. It did not break off yet but I don't see hjow to repair Thanks for your help.
  9. J

    Max HP Rating 13 ft Boston Whaler

    Hello Need some Help. I have a 1975 Boston Whaler 13ft Sourpuss Model does anyone have an idea what Max HP it will handle? It currently has a 1980 40 HP Mercury I am looking to upgrade to a johnson 48 160 Lb motor. The tag on the hull is no longer readable Thank you for your assisstance.
  10. J

    MERC 40 Runaway Motor

    Hello All Need some help. I have a 1980 Merc 40hp motor running well no issues until this. The engine accelerated out of control I was lucky I was running off of a garden house engine sped up to very high rpm's. I shut key switch off and motor continued to run. I pulled of both spark plugs...
  11. J

    Matching Correct Lower Unit

    Looks like we have a problem solved from a previous post. Now I need to match a replacement lower unit. I have located a used 50 HP Merc at a local yard want to see it it will match up to my 40 hp Merc. Would anyone have specific knowledge My motor 40 HP Merc Ser# 5750620 Donor Motor 50 HP...
  12. J

    40 Mercury Burning up Impellers

    Hi Needs some Help, Just bought a 40 hp Merc and 13 ft Whaler. Motor did not run, My Mechanic put in fresh gas ran good did not pump water.Removed lower until and installed new water pump kit. Started motor pumped water just fine. I started motor the next day no water.Mechanic then dropped lower...
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