1990 50 hp Force...problem

[peteypug]

Problems once again with the Motor.<br />Last week no problems, this week a nightmare.<br />Started motor as usual, problems idling, then on take off could only go 1/4 throttle. Bogged out.<br />With cowling off, manual operation of throttle revs up no problem. As soon as it goes in gear the engine will not go past 1/4 speed.<br />Inspected fuel sytem, hoses, filters, bulb, and carb, no water or trash. Intalled new stator and power pack during the winter. Plugs and wires excellent,. Boat ran great for last 2- months except for shifting into foward gear, adjusted last night in the barrell and remedied the problem. Did notice some bucking during neutral idle, but went away after warm up.<br />Put old power pack back on to see if this was it, engine turned with no start. Engine ran with newer power pack on, but only at 1/4 throttle.<br />Local guy is going to put newer power pack back on and dis mantle the carb this next week.<br />Chasing ghoasts again and looking for help.<br />Maybe a coil going bad...who knows at this point.<br />Thanks for any help....<br /><br />peteypug..<br /><br />formerly known as jasperastro...

 

[eurolarva]

Re: 1990 50 hp Force...problem

Do a compression check. You want compression numbers over 100 and within a couple of points of one another. Sounds like you are missing a cylinder. If compression is good start troubleshooting the ignition system.<br /><br />You might want to look at the fuel pump. Your diaphram could be shot or have a bad fuel seat.

 

[jasper astro]

Re: 1990 50 hp Force...problem

Thanks for the reply, I am at my computer at work and found my old password to log in as my original screen name.<br />I was suspicious of the power pack causing this problem described above. A friend of mine at work here suggested the plugs. It seems that these force motors are notorious for electrical malfunctions. From one week to the next I am always fixing something on this motor.<br />I sure do appreciate the help euro....and I will have my cajun backyard specialist check your advise. jas....

 

[peteypug]

Re: 1990 50 hp Force...problem

update......carb checked out today....clean. Compression good, Plugs good. Fuel pump working like a charm.Looks like power pack is the culprit.<br />Now that I remember, the day i was running the motor in the barrel i noticed the volt meter just about pegged out near 16....could this be another hint? This power pack is virtually brand new, after market CDI Force pack. No burned up wires or evidence of any damage. Eyeballed stator and all leads look good. Will consider another power pack.<br />My friend is really puzzled about these Force motors...electical hazard nightmare. This guy is a wiz on any other motor from top to bottom.<br />He recommends using it for an anchor, but I am not giving up so easy, I will keep trying....jas.

 

[peteypug]

Re: 1990 50 hp Force...problem

Update on 1990 50 hp, <br />Recieved new power pack, and installed today.Started right up!!.Noticed while reving the motor up, fuel coming out of carb on side near top of carb? This stopped after letting engine warm up. Seemed like it was flooding out. My friend working on the boat said this is a overflow hole for the carb? Carb was cold during the operation, condesation on the outside of the carb.<br />Motor was running rough, shut down. Upon inspection of the fuel lines, bad bulb. Replaced with modified Johnson fuel system, works real well. Drained fuel tank....sample of fuel revealed foggy looking fuel...murky. Compared sample to other tank as to which was clear and clean. Hooked up and ran in the barrell....excellent!!! Runs well, hard fuel ball.<br />I will get on Rayburn in the morning for the true test, my mechanic said watch for the fuel coming out of the carb, and get on it!!!<br />Thanks to Iboats forum for helping me!!, Recalled parts are pretty well hidden to the consumer, till you know somebody here....<br />Thanks again!!! Update to follow....carb concerns me now....<br />jas...petey

 

[eurolarva]

Re: 1990 50 hp Force...problem

chances are the fuel seat or needle are shot. NAPA carb kit cost 15 bucks. Part number 18-7037. The kit should come with instructions. could be just the float needs adjusting. It makes for a good saturday project on a rainy day. It is pretty simple to do considering your motor only has one carb.

 

[peteypug]

Re: 1990 50 hp Force...problem

I will check it out euro, I will see if it still leaks fuel from that hole this am.<br />Fixing to hook up and go, nobody wants to go with me, cold front moved through last night!!!<br />jas....

 

[peteypug]

Re: 1990 50 hp Force...problem

Update, returned from the Angelina River, Lake to rough.<br />Motor started out fine,idle good, started with one choke, had a rare backfire? Slowly left the ramp, then gradually got into the throttle. Seemed like the motor was bogging,flooding out?<br />Popped off the cowling and did not see any fuel coming out the top side hole as I mentioned in previous post.Motor would not come up to plane speed, about 1/2 throttle with the stick all the way down.Tried gradually and suddenly with same result.Put motor in neutral and manually ran the throttle...no problem...reved up great to wide open back to idle.<br />I am running out of options, and Iam beginning to guess at this point.Carb runs well out of gear, put on new power pack yesterday.New stator before this.New fuel lines and tank. I believe it may be a bad coil? or plugs. Compression is good, spark is good..puzzling. I will try to kit the carb, but it runs well and revs and idles fine out of gear. I will get my manual out and start reading again, any possiblities will be investigated. I am not and will not abandon ship!!<br />My friends are laughing at my Ancient Force!!!<br />About at the end of my rope...thanks for any advise....jas....petey.

 

[eurolarva]

Re: 1990 50 hp Force...problem

That bogging down could be the carb but it sounds more like the fuel pump. Have you replaced the diaphram yet? Also when you take the carb apart verify the float is set correctly. If it is set too low you may not be getting enough gas. When you have the fuel pump apart look closely at the fuel valves. There are three. Two that are press fit and one that is held in by two screws. Verify that they are in good condition and that the springs are working. It would not hurt to replace these but I would go with the diaphram first. If motor continues to run poorly you may want to replace those. The valves are about 5 bucks each and the gaskets that go with them are 50 cents each. The gaskets that come with the rebuild kits dont fit on the valves.

 

[peteypug]

Re: 1990 50 hp Force...problem

Parts list?<br />Coils?<br />Fuel pump?<br />Carb kit?<br />Plugs?<br />1990 50 HP Force<br />22530.<br /><br />Maybe something will come of this, one of these parts hopefully will cure the sickness!!

 

[peteypug]

Re: 1990 50 hp Force...problem

I have not checked the diaphram as of yet.<br />The question that is puzzling me is why does the carb function good when in neutral? You can rev it up, hold it and there is no problems?<br />I am reading the manual....<br />Thanks euro..<br />jas....

 

[roscoe]

Re: 1990 50 hp Force...problem

Just for grins, I would have someone else steer the boat, and try to work the throttle manually with the motor in gear.

 

[peteypug]

Re: 1990 50 hp Force...problem

I thought about that on the water, and ran out of hands trying to do so. Nobody was brave enough to go with me today, Rain...high winds.<br />I guess i could try this in the barrell out in the yard, but water supply runs out quickly even with hose on full bore...wearing my rain coat no doubt....<br />My local backyard boat mechanic mentioned pressure involved when the boat is in gear, from the fuel pump and the carb.|<br />I will give it a go again sometime this week, I know its something simple, because its never done this kind of stuff before...jas....

 

[jasper astro]

Re: 1990 50 hp Force...problem

Question? Friend at work has same problem with his Mercury 50 hp. Mentioned limit switch...boat will not go past 1/2 throttle, but when worked with manual throttle it goes full speed. He by passed limit switch and boat ran fine, except getting back into neutral. He ordered a new limit switch yesterday.<br />Could this be my problem, sure sounds suspisious?<br />jas....

 

[roscoe]

Re: 1990 50 hp Force...problem

your Force does not have a rev limiter. <br />It does have a Neutral interlock switch, which is depressed when in neutral, and allows the starter to engage.

 

[jasper astro]

Re: 1990 50 hp Force...problem

Finally talked to a certified Merc mechanic today, described all the problems, remedies already done, all of the above posts.<br />He came to the conclusion...High speed Jet?<br />He said to rebuild the carb, kit and clean and your problem should be cured.<br />I was not sure of the kit number though, <br />18-7037, or 18-7806?<br />1990 50 hp Force....model 22530?<br />I will give this a try i guess, I have never heard of a high speed jet? what is the function?<br />Thanks ....jas....

 

[eurolarva]

Re: 1990 50 hp Force...problem

18-7037 is the carb kit and 18-7806 is the fuel pump kit. The high speed jet is where the fuel comes from when running at higher speeds. The carb will have to be taken apart. All orifices should be sprayed with carb cleaner and gone through with a wire and then resprayed with carb cleaner. Soak over night and then go over it again with the spray and the wire and follow up with compressed air set to about 35 psi. Then put the parts in from the rebuild kit. Set the mixture adjust screw about 1 1/4 turn counter clockwise from fully seated. do not put any force on the adjustment screw when turning it clockwise. When it is gently seated then back off. The carb kit should come with a new spring for this screw. When you have the screw out check the tip of the screw to make sure it is not pitted, bent or dinged in any way.

 

[help_ma_boab]

Re: 1990 50 hp Force...problem

I don't mean to sound rude, but could it be too much play/slack in throttle cable? If so, then you may only be getting half throttle at helm, but when you manually throttle it at engine, you can get full bore? It should only take a minute to check - put throttle at helm to full, then go to motor, cowl off, and see if you have any more movement on lever.<br /><br />Hope its something simple like this.....<br /><br />Bill S

 

[artw45]

Re: 1990 50 hp Force...problem

I ran into the throttle cable problem with an old 35 hp johnson before. Worth a try if you can get some one to ride with you so you can pull the cowl off and play with it. The high speed jet seems likely if it's boogging down and not running right when you open the throttle up.<br />Art

 

[oby]

Re: 1990 50 hp Force...problem

A most interesting topic.This sounds exactly the same as the problem i have with my Volvo Penta 400.No one seems to know what the source of the problem is.Causing me no end of grief not to mention earache from wife...