1989 85 hp running rich

[mainejohn]

i have a 1989 85hp force. it seems to run rich. idles okay and full throtle seems good. it just when i take off fast or slow down fast it seems to stumble and stall. i have cleen the filter screen, put new plugs in, good spark, #1 cylinder has 125 psi compression, #2 has 130, and #3 has 130. what could i check to see the problem?

 

[pnwboat]

Re: 1989 85 hp running rich

Sounds like something fuel related. Check the filter screen in the fuel pump inlet cover, fuel pump diaphragm. Maybe a needle valve in the carb that's sticking.

 

[mainejohn]

Re: 1989 85 hp running rich

all 3 plugs are oilly wheni take them out. would any seafoam or power tune clean the carbs without taking them off?

 

[john from md]

Re: 1989 85 hp running rich

If you haven't decarbed in a while, do so now.

Next, you don't mention adjusting your mixture screws. These engines need tuning as they wear. Your setting from 1989 will not be the same as your 2009 settings. You need to adjust the carbs.

After you decarb and adjust the carbs, go out and pull a hole shot.

Let us know how it acts.

John

 

[mainejohn]

Re: 1989 85 hp running rich

i have put quick cleen in the fuel, but i haven't sprayed any power tune into it yet. last night i did check the fuel mixture screws. they were a little more then 1 turn out. so i reset them to 1 turn out. i did by some seafoam, should put a concetrated amount in the fuel and let it run on ear muffs?

 

[john from md]

Re: 1989 85 hp running rich

Go to the FAQ at the beginning of the maintenance forums. On the second page is the instructions for doing a decarb. Follow them and you will be set to go.

John

 

[mainejohn]

Re: 1989 85 hp running rich

i went home and ran the motoer with muffs on and noticed that gas was running out of the middle card. it was coming from a small like pilot hole on the top half of the card. it was on the passenger side. it was brass colored and hollow. so i took and blew some air into it and it pushed gas out another hole on the oppisite side. it seemed to stop the leaking. i will take it out tommorow and see if it runs better.

 

[pnwboat]

Re: 1989 85 hp running rich

Either needle valve is bad or float is set too high on that carb. Could also have been a piece of crud that prevented the needle valve from seating properly. Do you have an inline filter between the fuel pump and carbs?

 

[john from md]

Re: 1989 85 hp running rich

You need to tear that carb down and either adjust the float level or clean the gunk that's in it. YOu shouldn't keep running it that was as it is a fire hazard.

John