1992 force 90hp issues!

[ICE]

OK, heres the deal, I have a 1992 90 hp force outboard and well its about to drive me crazy!! its on a 15 ft open bow trihull with a 13 pitch prop on it. It starts up fine, but as soon as i give it throttle it bogs and dies. Now every once in a while it would get up to plane and my top speed was around 30mph. I took it to the local shop and they informed me that my timing was 10 degrees advanced so they set it to the 32 degrees and said it should run like a champ. Well, not so, i took it out and had the same issues but this time i took the cover off the motor and it seemed to act just fine, no hesitation at all however now i have lost 15 mph off my top speed maxing out around 13 to 15 mph!! the motor has around 115 compression and i know thats a little bit low but any ideas?? its heading back into the shop monday to add a few more $$ to this on going tab!! he thinks it might be the prop? spun hub?? but seeings how i was just doing over 30mph last time i was out, i doubt it.

 

[roscoe]

Re: 1992 force 90hp issues!

13 to 15 mph? What are your Wide open throttle (WOT) rpm's? If the engine is reaching high rpm, and the speed is low, then it is probably a spun prop hub.<br /><br />Also have them check for an exhaust leak inside the engine compartment. If it is leaking and re-entering the engine thru the carb, it will starve the engine of oxygen. When you took the cover off, the engine was getting fresh air. Not a real common problem, but it does happen.

 

[ICE]

Re: 1992 force 90hp issues!

well i dont have a tach on my boat but it sounds wound up when im crusing along at my neck breaking 13mph lol, i have 2 differnt ones but i have mercury controls and the force motor and im not even sure they know where the wire lead is to hook it up and they say neither will work. Got any leads on a good tach for this motor? that i wont end up spending major bucks? Also i forgot to mention that when the motor does bog then die there is a real strong fuel smell almost like its flooded but it starts right back up no problem and last time i pulled the plugs they were wet.

 

[ICE]

Re: 1992 force 90hp issues!

Update, I ran seamfoam through my motor and was suprised to gain up to 20 lbs of compression back!! the readings before the seafom were #1 105 #2 115 #3 120 Now all three are at 125lbs also the biggest problem I was having was the prop that i was sold was "rebuilt" and marked as a 13 pitch after having it in and out of the shop i fianaly took the prop into a specialist and he informed me that it was a 17 pitch that had been "reworked to a 15 1/2 which with my motor and my elevation is to much so I picked up a new 13 pitch prop today and am going to head out and giver a shot this weekend. On the bad side, I did find out that my lower unit is gone or at least my reverse gear and clutch. does anybody know a good connection for lower ends?? oh and i still cant seem to get my tach to work!! on the wiring harness i have it hooked up to the grey wire and have tried multiple tachs. Is there a way to chsck which wire of the 6 or so is the right one? perhaps with my multi meter??

 

[9675hpforce]

Re: 1992 force 90hp issues!

With that motor you should be around a 15pitch or maybe higher 17. Sounds like a common fuel issue. Try replacing the filter,new diaphram kit,check hose and replace. Then dump some Sea Foam in the tank also shoot some deep creep in the cyls real good and let sit overnight.

 

[jpbaker]

Re: 1992 force 90hp issues!

Just one question . You said they advanced your timing to 32 degrees? That's kind of high isn't it?? I thought these were no different the any other engine. I'am in Denver <br />and @ 10 btdc mine runs fine (96 75hp Force). At 32 I doubt it would even start let alone run without doing some damage. Just don't want you to do any further damage. ROSCO, DOC, you guys got any ideas .

 

[9675hpforce]

Re: 1992 force 90hp issues!

Top speed at Deer Creek was 30 wot, you might want to purchase your prop at the place next to hayes Brothers jeep in SLC. husler props are cheap

 

[9675hpforce]

Re: 1992 force 90hp issues!

I thought our 75s should be 32degrees advanced?

 

[The Marine Doctor]

Re: 1992 force 90hp issues!

90hp force engines run at 30 not 32<br /><br />Grey = tach<br />TMD

 

[jpbaker]

Re: 1992 force 90hp issues!

I just know that mine runs fine @10. hardly any smoke and then very little after trolling (@900rpm) for several hrs. Runs smooth without a tick. A little hard starting when cold, (Haven't adjusted choke) but just a flick of the switch once warmed up. I know that the manual says 32 is the Max. Hope I'AM not doing anything wrong.

 

[The Marine Doctor]

Re: 1992 force 90hp issues!

JP are you sure you are not refering to base timing rather than WOT?<br /><br />TMD

 

[jpbaker]

Re: 1992 force 90hp issues!

Sorry, yes this was base timing set while in the barrel and not WOT.

 

[ICE]

Re: 1992 force 90hp issues!

Ok yes they(both shops i took it to) told me that my motor according to specs is to be set at 32 degrees . Also i bought a new prop from A-Rock Prop on 3rd west and just off 33rd south. As far as the Tach goes, i have tried three different tachs 2 of which both shops said should work. I have the grey wire hooked up to the newest one with a good ground and a good ignition lead and im not getting any signal to my tach at all. So now what ? I will post the other colors that i have comming off my accesories lead asap. Does this forum allow pics? i could post a .jpg of the wires?

 

[roscoe]

Re: 1992 force 90hp issues!

As far as pictures go, you have to post them to a free picture storing site/server. Then link them here.<br /><br />A tiny tach should work. It picks up signal from sparkplug lead, thru induction.<br />Call them and tell them what you will use it for, and they will get you the right one.<br /><br /> http://www.tinytach.com/tinytach.html

 

[mrtool2u]

Re: 1992 force 90hp issues!

I have a 1989 Force 85 hp that uses the purple wire for the tach,,could you'rs also be purple.Although it has it listed right by the terminal block.

 

[ICE]

Re: 1992 force 90hp issues!

Im going to take a picture of the wires i have to choose from as well as any other areas u guys would like me take some of to help me in this venture. Ill post them tomorrow.

 

[force01]

Re: 1992 force 90hp issues!

angry force owner,<br />one thing to keep in mind your stator has a low speed winding and a high speed winding if your high speed winding has gone out you will never achieve full power. Good luck, bret forceparts@yahoo.com

 

[ICE]

Re: 1992 force 90hp issues!

Ok here is a picture of the wires and the control box that i have. The purple wire is the ignition wire, that i have been able to determine. The grey wire that i have been trying to hok it up to is the wire facing straight up. All i know about the control box is it says Quicksilver on the outside, one of the people who looked at it thought it was a commander 2000? Let me know if this is of any help to any of you guys or if you need me to take any other pictures.<br /><br /> http://208.140.10.55/public/ice/wires2.jpg <br /><br /> http://208.140.10.55/public/ice/controls.jpg

 

[ICE]

Re: 1992 force 90hp issues!

Hmmm well i guess those pictures didnt help lol well i took it out today with the new 13 pitch prop and it ran great at 25mph and that was WOT the only problem is that if i leave it at WOT very long the overheat horn goes off. So without a tach at this point Im not sure if i was over my rpm limit or not. I think I might just try a true 15 pitch just for the hell of it.