85hp Force - 1989 - WOT Bogging

The Force power

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Joined
Feb 3, 2019
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2,240
They didn't have the little springs on them! Received a new rebuild kit but I believe the mixture screw is incorrect ( too large ). Did include the springs which may fit. Sounds like this all checks out with the current issues. Thanks a million to everyone, what a great support site!

Why too large? too far sticking out? that's normal
Do NOT have them screwed in more than; ONE FULL turn out from seated
 

jerryjerry05

Supreme Mariner
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May 7, 2008
Messages
17,923
The air screw shouldn't have the springs if the
screw is located on the top of the carb.
If located on the side? then it should have the
springs.
The 90hp came with the screws on the side, the 85s
all I remember had the top screw.
My memory might be wrong??
 
Joined
Sep 10, 2020
Messages
16
Engine # 856X9G
Here's what im up against - not sure what is correct. There's conflicting imagery against my type of carb. the parts diagram for this one shows no idle mix screw on side, and replaces my top face air mix screw with a spring & jet. All 3 carbs are the same. ( just lost top carb. air mix screw ( vibrated out when unseated )

Parts diagram website
https://www.*****************/parts/f...f9c/carburetor
 

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Joined
Sep 10, 2020
Messages
16
Removed and blew out all the carbs with an air compressor, runs great, WOT seems a bit low. Anyone know the proper float height for a 90-94 Force 90hp carb? I set it to level for now cause I only have the 85hp service manual.
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
17,923
Level for the float.
The drop is more important, it should almost
touch the post as it drops.

I was wrong about the spring on the 85 carb.
The spring is there you just cant see it inside the carb.

Your right you do have a much newer carb.

The WOT changing the carbs: some of the cams change
from motor to motor and don't open the carb/throttle all
the way??

Also the prop and load in the boat can affect the WOT.
 
Joined
Sep 10, 2020
Messages
16
Level for the float.
The drop is more important, it should almost
touch the post as it drops.

The WOT changing the carbs: some of the cams change
from motor to motor and don't open the carb/throttle all
the way??

Also the prop and load in the boat can affect the WOT.

- Tried figuring what you mean by the float drop being more important. Honestly not sure, my inexperience

My Procedure is:

I've set the float level, then then slightly above level. I haven't yet noticed the trained eye's difference but speed tops out for both setting at just 17mph, just myself, boat mostly stripped & empty. All Idle screws 1 turn out.

Enriching all 1 1/8th out produces 20mph. I've seen it get near 30mph before
Maybe lack of fuel some how? My cheap inline fuel filters never get full...stay 8th full or nearly empty, usually pulling just what engine uses.

Could a very minute air leak cause lack of good fuel pressure, causing the issue of not enough power at WOT?
Are all idle screws to be tuned simultaneously? I've read such conflicting narration.

My Prop. is trashed, corners chipped, very haggard. Could that make 10mph+ difference?


( this forums best hands down best on the net, cheers )
 
Joined
Sep 10, 2020
Messages
16
I have not yet because the gaskets appeared "ok". I'd change it though just to deduct from the diagnostic procedure / maintenance schedule.

Could I test for adequate fuel pressure?

I've pulled the hose after the fuel pump, fuel spits quickly but I don't know what is enough.
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
17,923
The pump is a low pressure pump and if it's
spitting anything? It's probably ok.
BUT!! take it apart and make sure the diaphragm
is ok???
 
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