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Thread: 1987 Force 85hp motor, carburetor rebuild gonna happen.

  1. #11
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    Quote Originally Posted by Slab View Post
    Ahhh Haaa, hit that proverbial Ahh Haa moment. Diaphragm inside the fuel pump has a small tear.

    Attachment 450541

    Attachment 450542

    How about them apples. I always feel better when I can clearly identify and fix a problem. yay me, hopefully this is it!
    Had that happen to a buddy's 175hp motor ... while we were on the water ... I had to lay on the back deck & keep pumping the bulb to keep the motor running so we could get to the ramp.
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  2. #12
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    Small tear!!!
    Surprised it ran at all. Lol.
    No synchronization needed on the carbs.
    I’m sure you marked the carbs 1-3 and will put them back in order they came off.
    The linkage rod will do all the synchronization needed.
    New needle and seat?
    They really are pretty simple.
    Looks like you know what you are doing.
    Good luck


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    Dang it, I tore that fuel pump gasket while putting it together. Stupid holes in the gasket are smaller than the bolts that go through it, so it spun and tore.

    Chuck, after seeing the carbs so clean I looked at the paperwork that came with the boat. Turns out the carbs were were rebuilt 5 years ago. Doh, good news. So I inspected the seats and did not even fool with them. They looked fine. Easy enough to get to if I do have to address them. But the little clip that holds the tiny rubber seats down look challenging so I said heck with it, good enough.

    I was all ready to give her a run, now I gotta wait for a gasket. Dang

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    From what I’m seeing in the picture of the carbs they need to be tore down and put in a ultrasonic cleaner.Cleaned and then rebuilt JMO
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    Quote Originally Posted by CrappiePappy View Post
    Had that happen to a buddy's 175hp motor ... while we were on the water ... I had to lay on the back deck & keep pumping the bulb to keep the motor running so we could get to the ramp.
    Had to do that to get back to the ramp with a pull start 25 Yamaha. If you didn't pump just right it would stall. Shoulder was trashed for weeks from restarting
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    Looks like you fellows had a ball, and yes I do think those carbs need some attention. Good luck with your project boat.

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    Good job. Hope that’s it and fixes it.

  8. #18
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    Quote Originally Posted by Slab View Post
    Dang it, I tore that fuel pump gasket while putting it together. Stupid holes in the gasket are smaller than the bolts that go through it, so it spun and tore.

    Chuck, after seeing the carbs so clean I looked at the paperwork that came with the boat. Turns out the carbs were were rebuilt 5 years ago. Doh, good news. So I inspected the seats and did not even fool with them. They looked fine. Easy enough to get to if I do have to address them. But the little clip that holds the tiny rubber seats down look challenging so I said heck with it, good enough.

    I was all ready to give her a run, now I gotta wait for a gasket. Dang

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    I had to rebuild my old Yamaha 2 stroke carbs about every couple years. I know what you are talking about the tiny wire holders for the needle. Thought I read you may be concerned about the float bowl level on one of the carbs?
    Did you reset it?
    I assume you know how.
    The needles get dried out from time to time and become hard.
    You probably know that you can check if the needle is seeding properly by slight air pressure even just blowing into them without using compressed air turning carb upside down while blowing.
    Lots to type about carbs. I have built, re jetted hundreds over my lifetime.
    Boats, vehicles, but mostly Harley’s.
    I have a garage full of them with parts.
    I don’t know squat about the newer fuel injected stuff. Lol
    You can always call.


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  9. #19
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    Quote Originally Posted by Chuck Adams View Post
    I had to rebuild my old Yamaha 2 stroke carbs about every couple years. I know what you are talking about the tiny wire holders for the needle. Thought I read you may be concerned about the float bowl level on one of the carbs?
    Did you reset it?
    I assume you know how.
    The needles get dried out from time to time and become hard.
    You probably know that you can check if the needle is seeding properly by slight air pressure even just blowing into them without using compressed air turning carb upside down while blowing.
    Lots to type about carbs. I have built, re jetted hundreds over my lifetime.
    Boats, vehicles, but mostly Harley’s.
    I have a garage full of them with parts.
    I don’t know squat about the newer fuel injected stuff. Lol
    You can always call.


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    I need help, when you coming to Florida. lol. Yeah maybe I do a complete job next time and replace those seats. Easy enough to get at.

    And maybe we're talking two different things. Yes there are tiny wire holders for the needle, but I'm talking about the seat for the needle, which is what I did not replace. They are rubber (green rubber) and held in place with a circular piece of wire. We're getting into the weeds, but if you look at 7:25 into this video you'll see what I'm talking about.

    The other part of the reason I did not replace those is the stupid kits I bought did not include them. They looked fine to my eye. So hopefully the real problem I am having is with the torn fuel pump diaphragm which I found.
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  10. #20
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    The needle valve seats are the green puck (with a hole in it) like things and the circle of wire that holds it in place way down in the hole.
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