still stumped. 1989 175GT

[tashasdaddy]

Re: still stumped. 1989 175GT

rain here for the Day. tomorrow.

 

[Lone Duck]

Re: still stumped. 1989 175GT

If the R.P.M. doesn't change when you pull a plug. Find out which plugs are hot when you shut down. It could be a clue.

 

[tashasdaddy]

Re: still stumped. 1989 175GT

here is Flywheel and Stator. i see nothing wrong. key not sheared or damaged either.

 

[JustJason]

Re: still stumped. 1989 175GT

TD
food for thought...
1. you said timing was spot on, have you checked if the advance is working and spot on as well?
2. Have you tried a portable 3 gal fuel tank with known frest gas yet? check for water in the existing system, existing fuel filter, old gas etc.?
3. have you done a restriction test on the fuel system?
4. has anybody messed with the wiring on it? As in has anybody played with the wires coming out of the switchbox to the coils? (effectively throwing off the firing order)
5. any chance you have a KV meter and can check the discharge voltage from the coils?
6. double check crank vac line to vro. If it's not clamped down, if the hose is cracked and leaking air in the vro will pump foam instead of oil and will not pump enough fuel. If you can put a mech's stethoscope on the pump and count the number of clicks per minute at idle, i'll have to find it but there's a spec for it someplace that i've seen in print. if the clicks are off then the pump is leaking air or is bad.
7. you said compression is great, and I belive you. are they all above 75psi on that motor?

all i can think of for now

 

[tashasdaddy]

Re: still stumped. 1989 175GT

compression +- 2 from 100 psi. used test tank, drained main tank, new fuel. wiring is 100%. yes, know all about troubleshooting, before, parts.

 

[JustJason]

Re: still stumped. 1989 175GT

compression +- 2 from 100 psi. used test tank, drained main tank, new fuel. wiring is 100%. yes, know all about troubleshooting, before, parts.

I was just throwing things out there. Obviously your missing that 1 thing thats causing your bog. Do you have a copy of the vro pump output test? For people that read this thread the vro pump output test is completely different than a normal fuel pump.

 

[ezeke]

Re: still stumped. 1989 175GT

Cannot see the breaks in the triggering magnets on your flywheel, but compare yours to the diagram.

http://cdielectronics.com/downloads...09 - OMC Flywheel Trigger Magnet Location.pdf

 

[tashasdaddy]

Re: still stumped. 1989 175GT

you were correct, how do i fix it???

 

[bktheking]

Re: still stumped. 1989 175GT

you were correct, how do i fix it???

The last gent on here who messed with the magnets ended up buying a flywheel from Faztbullet, hope ezeke can help you out, there must be a trick to it.

 

[James R]

Re: still stumped. 1989 175GT

Hi TD. Tricky one this one. It could be more than one problem of course. Was there any sign of fuel leakage past the upper seal. If so this could account for one cylinder not performing.
I realize that you have strong sparks but these switch boxes are funny things. If you have a spare try switching out.
I had a similar problem with a 90s 70HP and never did find the problem. The customer wouldn't spring for that expensive switch box so I couldn't do the test. I still think that that was the problem. I replaced the reeds but it still did not fix the stalling out when engaging the prop.
Did all the other stuff of course.

 

[tashasdaddy]

Re: still stumped. 1989 175GT

i think this is the problem, it throws the timing off, as when i check the timing it was way off, adjusted it, but now it is really rough. there is obvious evidence the timing has been messed with. the distance the timing was off, coincides with the magnets.

 

[bktheking]

Re: still stumped. 1989 175GT

i think this is the problem, it throws the timing off, as when i check the timing it was way off, adjusted it, but now it is really rough. there is obvious evidence the timing has been messed with. the distance the timing was off, coincides with the magnets.

Those magnets being rotated will throw the timing out, hense the reason why it will run ok at idle and has no power when it has a load, I'm suprised it runs at all but like ezeke said if they are off a little they will still run, I think you've got it licked.

 

[ezeke]

Re: still stumped. 1989 175GT

I don't know any way of repairing it that I would want to guarantee, so unless someone else chimes in, I would consider looking for another flywheel.

That particular flywheel is used from 1989 through 1992 on the 150 and 175.

See if Dale Hadley knows a good way to glue them in place.

 

[bktheking]

Re: still stumped. 1989 175GT

I don't know any way of repairing it that I would want to guarantee, so unless someone else chimes in, I would consider looking for another flywheel.

That particular flywheel is used from 1989 through 1992 on the 150 and 175.

See if Dale Hadley knows a good way to glue them in place.

Read this from another site:


Do not try to reglue a spun center magnet. My contacts at Evinrude tell me that even they have no means of doing that. Its not possible to accurately align the magnetic lines in the magnet so you will never know what your timing is and can burn a piston in just minutes if the timing is too far advanced.


Guess it's time for a flywheel, Faztbullet may have another one for you in his vast parts collection.

 

[tashasdaddy]

Re: still stumped. 1989 175GT

i sent a PM to Dhadley earlier to look at this thread. hope he will.

 

[JustJason]

Re: still stumped. 1989 175GT

interesting that you could get the base and advance timing correct with a spun center hub. I would think there's not enough travel in the timer base to set it right like that.

 

[Dhadley]

Re: still stumped. 1989 175GT

The outer magnets being loose will not change the timing but the center hub magnet being loose will do all sorts of bad things. Yes, there are "maps" for relocating the center hub magnet. The folks at Evinrude do indeed have the "map" but they probably won't share due to the liability. We had one at one time, I'd have to see if it's still around. In the meantime I'd get a copy of the different center hub locations and look for another flywheel. Just make sure to get the correct flywheel for the ignition system you're using.

 

[tashasdaddy]

Re: still stumped. 1989 175GT

thanks, for the info.

 

[JustJason]

Re: still stumped. 1989 175GT

The outer magnets being loose will not change the timing but the center hub magnet being loose will do all sorts of bad things.

Hmmm... interesting. I had an older J200 that I couldn't get in time to save my life... and the stator was also producing close to 500 volts. Many of the outer magnets on the flywheel where broken producing to many poles, and the overvoltage. And the center hub was also spun, hence, couldn't get a correct ignition timing.
I replace the flywheel, and the stator (because it was half fried from over voltage) and that motor was fixed.

I'm curious. The outer magnets run the cap charge coil and bat coil, but If the center hub is spun then the magnet is going to swipe the trigger either to early or to late depending on which way it spun. At least that's how I understand it. If i'm wrong please tell me how the inner magnet can spin and not throw out the timing.

 

[Dhadley]

Re: still stumped. 1989 175GT

Hmmm... interesting. I had an older J200 that I couldn't get in time to save my life... and the stator was also producing close to 500 volts. Many of the outer magnets on the flywheel where broken producing to many poles, and the overvoltage. And the center hub was also spun, hence, couldn't get a correct ignition timing.
I replace the flywheel, and the stator (because it was half fried from over voltage) and that motor was fixed.

I'm curious. The outer magnets run the cap charge coil and bat coil, but If the center hub is spun then the magnet is going to swipe the trigger either to early or to late depending on which way it spun. At least that's how I understand it. If i'm wrong please tell me how the inner magnet can spin and not throw out the timing.

As I said, the center hub magnet being loose will throw off the timing. The outer magnets being loose will not change the timing.