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    1990 Bayliner Trophy with twin Force 120s need advice on prop sizes

    So, I sprayed carb cleaner around the exhaust cover and the engine died. One cover bolt is rusted inside also. Can the exhaust cover cause idle issues? It was replaced when I rebuilt it but I did not put any sealant on the bolts. Also the plugs on this engine are clean compared to the other...
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    1990 Force 120HP carbs mix adjustment help

    Here is a picture of the spark plugs after usage. The problem engine plugs are pretty clean with a drop of black fuel/oil mix. I don't even know if that drop is oil or water. The other engine plugs look different.
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    1990 Force 120HP carbs mix adjustment help

    So when I rebuilt the engine I changed the gaskets. Here are pics of some of the bolts from the exhaust cover. One in particular is rusted all the way in. I am sure I cleaned it when I put it in. I did not use any sealant on the bolts though.
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    1990 Bayliner Trophy with twin Force 120s need advice on prop sizes

    At wot on the lake one goes to 4200 and one 4400 max rpm. I think it os supposed to be 5200. Max speed is 38mph. And yes one of the engines is fully rebuilt but it gives issues in gear on the lake. It dies so I have to raise the idle to max with tye stop screw. I just sprayed starting fluid and...
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    1990 Bayliner Trophy with twin Force 120s need advice on prop sizes

    I am looking into that. One engine runs fine. It's tye one I rebuilt that has the issue in dying in gear in water not on hose or tank but only in gear. I just sprayed starying fluid and when doing it on the exhaust cover motor goes down at idle and even died once. I assume that is not supposed...
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    1990 Force 120HP carbs mix adjustment help

    Ok so on both engines when I take off number 1 and 2 plug wires there is little change in running but there is spark. On 3 and 4 especually 4 the engine dies. But both are the same at idle. I just sprayed 1 can of starting fluid at the intake recirc area and nothing. If I spray the carbs at the...
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    1990 Force 120HP carbs mix adjustment help

    Thanks man so I have been trouble shooting for ever. I wrote about it throughout the thread. I don't know when this started since I haven't put it in water before the rebuild. So I do have spark on all the coils. CDI stator and trigger are good measure good. Fuel pump and hose all new. No air...
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    1990 Force 120HP carbs mix adjustment help

    Thanks man I don't know why the guy I got it from used 13x19 to replace the old propellers that have a 21 marked on them. I think everywhere I looked for the 120s they recommended 13.5 x17 or 15. Anyways so to keep the motor running în gear I had to have the engine idle at 1100 RPM when I put...
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    1990 Force 120HP carbs mix adjustment help

    Put it back on the lake and I had to adjust the idle screw all the way up. It held idle at 1150 and 800 something in gear. It sometimes died but a lot of times it was ok. I still think there is an issue because I had to turn the idle screw all the way in. I must be missing something. The...
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    1990 Bayliner Trophy with twin Force 120s need advice on prop sizes

    Do on the boat there are 2 props 4 blades 14 by 19 I will show pics. The guy replaced 2 older 3 blade props and the only marking is a number 21 on them. There is also a 3 blade white prop that has 13.5x15-k on it.
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    1990 Bayliner Trophy with twin Force 120s need advice on prop sizes

    It has 4 blade Turning Point 13x19 on right now and it only reaches 4100 RPMs on the dash could be more or less on a digital gauge. I read some and it is mentioned that 13.5x17 or 13.5x15 if heavy load is the way to go. This boat is heavy at least 3500Lbs maybe more. I am going to fish it on the...
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    1990 Force 120HP carbs mix adjustment help

    I got all the gaskets and the fuel pump membrane and gasket. In the pump I took out the screen and there was some sediment in there, sand and black stuff. Cleaned it put it together, changed and clamped all the holes, new fuel filter, put the reeds and gaskets plus carbs back on. The motor now...
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    1990 Force 120HP carbs mix adjustment help

    So as you can see above the reeds are stainless not plastic. They look new. I am waiting for the gaskets to put it all back. As I said the membrane on the fuel pump had a little scratch looking mark along the circular line. It was showing only on one side of the membrane not the back. So, I...
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    1990 Force 120HP carbs mix adjustment help

    The elbow connector for tye cylinder drain cover was loose could turn it by hand. So I will have to remove it and tighten it. I will change the hoses and add clamps. There are no clamps there, don't know if that makes a difference.
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    1990 Force 120HP carbs mix adjustment help

    I took out the reeds and they are not the plastic ones. No light going through don't see cracks. I also remived the fuel pump and the membrane shows a little tear. I ordered new gaskets and membrane for everything.
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    1990 Force 120HP carbs mix adjustment help

    Yeah if it sits for awhile then I have to spray fuel at the top carb and it starts. Might take 2 tries but it does. Then it restarts no problem. The choke butterflies are fine remember I swapped the 2 carbs with the other motor and they work fine there. It was starying fine until a few weeks...
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    1990 Force 120HP carbs mix adjustment help

    Thanks for the reply. You should be able to see the video without login in right? I opened the drive and by the clutch dog there were 2 spacer washers. I took out the thinner one put it all back and now the drive is moving just like the other one same play same turning without the plugs in in...
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    1990 Force 120HP carbs mix adjustment help

    Jerry and Nordin help please. Thanks guys
  19. G

    1990 Force 120HP carbs mix adjustment help

    Yes it idles ok in neutral. In gear it shuts down unless I raise the idle speed to 1200. I am perplexed as to this issue. After going through all the repairs and I cannot get it to run right. On water it goes ok with the other engine in tandem. But at idle it dies at 800 RPM or anything below...
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    1990 Force 120HP carbs mix adjustment help

    Today I took it to the lake again and even after adjusting it all it acted the same dies in gear. I had to put the RPM at 1250 to even get it to stay at idle in gear. At higher RPM it seemed like it was following the 2nd engine but at idle it wasn't pretty. I filmed...
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