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    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    I need at a minimum to choose diameter and number of blades. It looks like aluminum 3 blades and 14 x 13 is popular for similar boats and HP. And this (as stated above) should get me in the higher end of the manufacturers recommended range. Does that sound reasonable? I did read a report from...
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    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    > Very hard, Engine is strained, and Melted Pistons can occur I better make this a priority. I bought the boat a couple of months ago. No idea why it has this prop. > However, it would be very cool to live on a large lake I'm kind of envious of people who can take long trips and adventure...
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    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    Is it correct to think that it's lugging now? (Assuming it's not a problem with the motor itself.) Like riding a bicycle up a hill in a gear that's too high. You should shift to a lower gear and increase the rpms
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    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    > Pontoon boats do not really have a hole shot, as they do not really plane out. Yeah it's always got a lot of big pontoon surface making contact. And all the water jetting between the transom and toons at WOT does not look efficient at all. I wonder if it is hard on the motor, or is...
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    1990 90HP Pontoon, 4300 RPM at WOT, Do I need a new prop?

    OMC says rpm at WOT should be 4500 -- 5500. I get 4300 now. Should I try a new prop? Evinrude 90HP V4 model: E90TLESB Compression: 122 +- 2 psi on all four cylinders 389948 Evinrude Johnson Stainless Steel Prop (13-3/8 x 17) Thru-Hub Exhaust. Has a small ding on one blade. 24 foot 1994 Crest...
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    1990 90HP E90TLESB rough at low RPMs

    This problem is solved. I got more precise info, so I started a new topic to keep extraneous info out of the thread: https://forums.iboats.com/threads/1990-v4-runs-on-two-cylinders-at-low-rpms.768522/ That new topic was finally solved. The plastic float bowls were warped. I sanded them and also...
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    1990 V4 runs on two cylinders at low RPMs

    A final note: I adjusted both the toothed wheel where the throttle cable is anchored to the motor and the idle stop screw. I started the motor several times over a few days. It starts and idles well indefinitely at low rpm. Seems fairly smooth at all speeds.
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    1990 V4 runs on two cylinders at low RPMs

    The bottom carb is a little wet around the gasket, upper carb dry. I don't see any fuel leaking enough to make a drop or run anywhere. I still don't trust that the seal is good everywhere it should be. At some point I'll get new metal float chambers. I did the throttle valve synch and adjust...
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    1990 V4 runs on two cylinders at low RPMs

    The sudden loss of power yesterday happened when the link between the carbs jumped out of the upper retainer clip. Retainer seems worn. I've been trying different configurations of zip ties to hold it in (I'll order another clip) The boat ran really well for several minutes at high speeds and...
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    1990 V4 runs on two cylinders at low RPMs

    Update: I sanded the mating surface on both of the plastic float chambers. Reinstalled carbs. Now primer bulb goes firm when pumping. No visible signs of leaking fuel. Started motor. It was idling much higher than it did before the problem. So I turned the idle adjustment stop screw out all the...
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    1990 V4 runs on two cylinders at low RPMs

    Put the rebuilt carbs on the fuel manifold today in the light. Gaskets leaked still. Tightened screws till fuel stopped running out around the gasket to the outside of the carb. Then, working the primer bulb, the lower carb flooded again. Pump slowly, fuel runs out the brass tubes. Pump a little...
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    1990 V4 runs on two cylinders at low RPMs

    > I ALWAYS blow into the fuel inlet with a rubber hose with the carb both inverted and right side up I'll try to remember this. I really want to find ways to test everything without reinstalling the carbs. I saw a post on some forum a few days ago of measurements taken from the float level...
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    1990 V4 runs on two cylinders at low RPMs

    I wasn't able to find anyone selling the float gauge tool online. I wondered why the drop matters, just to keep the float from striking the cover? Even if I get the motor running, I imagine that it won't be optimum if the float level (not drop) is a little off.
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    1990 V4 runs on two cylinders at low RPMs

    I used blue loctite and tightened them till snug and then a bit more. (Next time I'll count fractions of a turn). I thought it should be sealed pretty well. Hooked them up the fuel manifold and an assistant worked the primer bulb. There was a lot of leaking at the gaskets. I alternated...
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    1990 V4 runs on two cylinders at low RPMs

    If I could get the boat running and the bowls were just dripping some, I'd be a lot happier. For five or ten minutes, then I'd curse at the bowls and replace them.
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    1990 V4 runs on two cylinders at low RPMs

    From the little bit of searching around on line, it looks like it's fairly common.
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    1990 V4 runs on two cylinders at low RPMs

    The kits were 28 dollars on amazon. Supposedly Johnson Evinrude, and that's what was written on the bags. And maybe BRP. Unfortunately, I tossed the bags. The old floats had the OMC M molded in. The new floats just have a number molded in. I did keep both old floats and gaskets and one pin and...
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    1990 V4 runs on two cylinders at low RPMs

    Here is the drop on the lower carb float. It's hard for me to measure and photograph:
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    1990 V4 runs on two cylinders at low RPMs

    > even with, and parallel to the Bowl Gasket Looking at my carbs and recalling what they look like and looking at videos of identical carbs, I'm guessing that my carbs don't follow that rule. It looks like what is normally the top sits about 3/16 inch below the top of the installed Gasket. It...
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    1990 V4 runs on two cylinders at low RPMs

    I was wondering what might make a float go bad. I sort of assume they were hollow. But they look like a solid. Becoming saturated makes sense. But I put new floats in when rebuilding. I don't have a tool to check the height, but I did check that the top is level and that the drop is 1 to 1 1/8...
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