1998 90hp force carb help

[A.Hoj]

I did some searching here and other online sites but I can't find the info I need. I am wondering if there are any other carbs that will work on my motor (middle or bottom) besides the ones that came on the motor. The numbers are WB134A-734 (854450). These carbs are hard to find and I haven't been able to find a replacement yet. My issue is with the bottom carb, I've rebuilt them all but the bottom carb keeps letting fuel leak past the inlet needle and overflows when I pump up the primer bulb. I think the needle seat is damaged or screwed up just a little and since they aren't removable I have no way to fix it. If you know of any other solutions besides finding a replacement carb please let me know.

Thanks,
Andrew

 

[Jiggz]

Re: 1998 90hp force carb help

Most of the time the reason the bowl overflows is because either the float is not set right that it does not allow the needle valve to seat properly against the inlet seat or because the needle valve is dirty. Anyways, there is a WB133A carb on *bay which is supposed to be only for the top carb. But the truth all three carbs are identical except for the elbow fuel connectors for the bottom and center. You can get this carb from *bay and just replace the elbow connector with the one you have right now. Or if it was me, I'll just buy one carb kit and just replaced the needle seat. I understand it says, do not remove, but yes this can be replaced as long as you have the correct replacement.

 

[HotTommy]

Re: 1998 90hp force carb help

Andrew,
This is a shot in the dark because I'm only a novice marine mechanic myself. But I noticed that the carb kit I just installed for my 1993 Force 150 included a needle and seat. Out of curiosity I looked up the part number for the needle in my carb and compared it with the number for one of the 1998 Force 90 carbs. It was the same number: F10265. The number for the seat in my kit is F10367. .... I don't know if that seat can be used to replace the one in your carb, but perhaps it can. Hopefully one of the more experienced folks here can provide a definitive answer.

 

[Frank Acampora]

Re: 1998 90hp force carb help

Most of the time if a Tillotsen carb has a pressed-in seat, the seat will be solid metal and the needle will have a rubber tip. very little can go wrong with these seats so any leaking will be due to wear of the rubber tip or a completely missing rubber tip OR--perhaps the original owner replaced the needle with a solid tip one and that simply will not seal.

SO: First check that the needle is correct and not worn. Double check the float level because an improperly set float will also prevent sealing. Finally, if you need to replace the seat, screw in an appropriately sized screw and use it as a puller. Press in a new seat using a very small amount of sealer under the flange.

As to your initial question: ALMOST any Tillotsen WB carb with a 1 5/16 venture can be used but if you do not match them, that is use three of the same number, you do run a risk of engine damage. At any rate, given your problem I would not change carbs.

 

[A.Hoj]

Re: 1998 90hp force carb help

Thanks for the replies guys. I did buy new inlet needles and reset the float level, but that didn't help. It actually works better with the old inlet needle which is only two years old anyway. I've had this problem on and off since owning this motor. That's what leads me to believe that Something may have damaged the needle seat like a small scratch or something.
Frank, do you know the part # for the needle seat that will work on that carb? It's not listed on any of the parts breakdowns that I found for that carb.

 

[Jiggz]

Re: 1998 90hp force carb help

If you can post a pic of the seat and the needle it will make it easier to ID for forum remembers to compare with what they have or experienced. Did you check the *bay carb I referred to?

 

[A.Hoj]

Re: 1998 90hp force carb help

Jiggz- I'm pretty sure I saw the one you referred to. I'm gonna hold off for now and see if I can't get this fixed on my own. I ran it all day Saturday with no problem. I'll take the carb off and get a pic up here when I get a chance to work on it again.
It seems the top two carbs hold fuel fine but the fuel in the lines between them will eventually leak down to the bottom one and into the intake out our the overflow hole. I have clear fuel lines between the carbs so I can see it as it goes down. It's not so bad that I can't run the motor, but I really like to fix it altogether.

 

[MickLovin]

Re: 1998 90hp force carb help

Frank A should my 100HP Chrysler have rubber tip or solid, I know they spit a bit when you choke, but I am going to the motor every second day to find a little pool of fuel in the cowl. They still run ok, it is a bit thirsty and I have a kit to come but not sure now about the rubber tip needle.

A.Hoj you are saying that you see it leak down, could be the fuel diaphram, have you had problems with priming it at all?
It could also be just a loose fuel pipe connection, letting air into your fuel system.
I also have clear lines on my 100HP and have the same problem but I only have 2 carbies, I am pretty sure I have a air leak between the water seperator and the tank. So with mine it could be a cracked pick up in my 20 gallon tank. But in saying that it is fine when it is running as it does stop pulling air when primed and running.

 

[Jiggz]

Re: 1998 90hp force carb help

Jiggz- I'm pretty sure I saw the one you referred to. I'm gonna hold off for now and see if I can't get this fixed on my own. I ran it all day Saturday with no problem. I'll take the carb off and get a pic up here when I get a chance to work on it again.
It seems the top two carbs hold fuel fine but the fuel in the lines between them will eventually leak down to the bottom one and into the intake out our the overflow hole. I have clear fuel lines between the carbs so I can see it as it goes down. It's not so bad that I can't run the motor, but I really like to fix it altogether.

Remember all three carbs are identical except for their fuel connectors. If you think by moving the bottom carb to the top to prevent leak down of fuel do so as long as you also switch the fuel connectors.

 

[MickLovin]

Re: 1998 90hp force carb help

Jiggz is there anything stopping the carbies from being fed from the top?

 

[Frank Acampora]

Re: 1998 90hp force carb help



Fuel pump(s) supply more than is needed you can feed carbs from any spot. Notice the fuel filter between these carbs.

 

[Jiggz]

Re: 1998 90hp force carb help

Jiggz is there anything stopping the carbies from being fed from the top?

The problem being presented is the fuel leak on the bottom carb caused by improperly closing needle and inlet port. Because of this when engine is not running, the remaining fuel in the lines from the top two carbs (and probably including fuel from the bowls) drains down to the bottom carb almost like being siphoned because the bottom carb inlet needle does not shut all the way thus leaking fuel into the overflow vent of the carb. It is not a problem of fuel delivery into one or two or all three carbs but more about fuel leaking down.

So if he moves the bottom carb into the top and vice versa, there will be less fuel leak not to mention prevents siphoning of the fuel hose and carbs. But it still would not stop overflow leaks when motor is running. The correct repair is to replace the needle or port seat to properly close on the affected carb.

 

[MickLovin]

Re: 1998 90hp force carb help

So would my 100hp come with solid or rubber tip needles, as I have a similar problem, but not as bad.
And Frank A stop showing off your carbie covers already, you know I am jealous. Stupid fuel leak washed the silver I had painted mine with