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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
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    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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    1990 Force 120HP carbs mix adjustment help

    Anybody have a take on the rectifiers?
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    1990 Force 120HP carbs mix adjustment help

    Ok so the 120 from 1990 has a 7A charging system and the original rectifiers would dumping voltage to ground above a certain number of volts. So my questions is can I use the square rectifier with 4 or 5 wires(2x yellow, 2 or 1x red, grey and with or without black) I think those are for the 16A...
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    1990 Force 120HP carbs mix adjustment help

    Have a question the 120hp original rectifier is FORCE#F369450-1. That's 120 bucks. On mine the second 120 has a 815279T Regulator Rectifier https://a.co/d/50I0yTb and it works fine. I used a similar one on the other but only one red wire https://a.co/d/iinhc3w My question is if there is a...
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    1990 Force 120HP carbs mix adjustment help

    I redid the timing it was at 29 so put it back to 28. RPM on the hose is at 1100. I have a lot of room to raise it now. The other day on the lake I had it up almost all the way to hold idle in gear. I hope this makes a difference in the water. It sounds way better on the hose then before. I...
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    1990 Force 120HP carbs mix adjustment help

    Ok I think I got it. I did 3 1/2 out for the lower gear shaft. I Set the interlock shaft and towershaft arm at the same height and in neutral by playing with the 2 nuts. I adjusted the neutral switch cam to the switch button. Adjusted the eccentric roller for idle and the throttle link shaft at...
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    1990 Force 120HP carbs mix adjustment help

    So in the 1990 96, 90, 120, 125 book they mention to screw the shaft in all the way and back out 4 turns. I wonder, are those 4 complete 360 turns or would 180 be considered a turn? My problem engine was out half a turn so completely bad. The other good engine is out 2 full and a half.
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    1990 Force 120HP carbs mix adjustment help

    Ok I took the boat out yesterday and of course the rebuilt engine was giving me issues to stay at idle while in gear. So, I readjusted the pivot throttle cam to touch the roller perfect. But then I still didn't get idle in gear so I had to adjust the throttle link bar to extend it so it can push...
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    1990 Force 120HP carbs mix adjustment help

    This is a double post
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