72 evinrude 125 flywheel

[slyshar3]

Could the flywheel be defective on my evinrude starflite 125? It has a missing problem. The boat repair man can't find anything wrong. He replaced one coil, cleaned the carbs, replaced the dist. cap, etc. The motor has perfect compression, and nothing else wrong. He replaced the flywheel, and says that it ran better in the tank, bu the couldn't keep the wheel because he borrowed it and says that it wouldn't cause any problems anyway because the magnets are tight. It ran a little better for awhile, but gradually got worse. I ran a link and sync, and it made much worse. Any suggestions?

 

[Solittle]

Re: 72 evinrude 125 flywheel

Go to the FAQ Section & read A.

 

[slyshar3]

Re: 72 evinrude 125 flywheel

A says that I have to register.. I am registered. I'm afraid that you have lost me...

 

[BoatBuoy]

Re: 72 evinrude 125 flywheel

Are you logged in?

 

[slyshar3]

Re: 72 evinrude 125 flywheel

Yes I am.

 

[R.Johnson]

Re: 72 evinrude 125 flywheel

If your engine is a 72, 125, it only has one ign. coil. That engine has a battery CD ign system. The flywheel magnets are for the alternator charging system, they have nothing to do with the ignition, other than keeping the battery at the proper voltage. Tight connections, and good grounds are very important with this system. When he replaced the dist. cap, what about the rotor? Was it checked for a crack, or carbon trail? There is also a anti-reverse spring which is probably in need of replacement on an engine this age. This system can be tricky to trouble shoot if you have'nt worked with them. You are dealing with a cap, rotor, sensor, pulse pak, clipper assembly, coil, and high tension leads. They all have to be gone over, one by one.

 

[slyshar3]

Re: 72 evinrude 125 flywheel

thank you very much. I have a manual and will get started asap.

 

[John Bett]

Re: 72 evinrude 125 flywheel

Hello, 72 rude. I have the same motor. I was just curious what your compression was?

 

[slyshar3]

Re: 72 evinrude 125 flywheel

115 on each cyllinder. Is this motor p.... you off as much as it is me?

 

[slyshar3]

Re: 72 evinrude 125 flywheel

Does anyone know how that anti reverse spring can cause a miss? The wierd thing about this problem is that with a brand new set of plugs it runs great for about 5 minutes, then slowly starts missing again. Sometimes at full throttle for longer trips, it smooths out and runs great. But after a few minutes of slow speed operation, it really gets bad.

 

[R.Johnson]

Re: 72 evinrude 125 flywheel

The anti-reverse spring is nothing but a friction spring that fits around the crankshaft under the ign. stator plate. Being a friction spring it is subject to wear. It is pulled around by cranshaft rotation in the direction of crankshaft travel, and stopped by a notch in the ign. stator plate. If the engine were to backfire on start-up, and try to run backwards, which a two cycle engine can, the spring would follow crankshaft rotation, hit a ground contact, and kill the ignition. Being subject to a lot of friction, and wear, if it breaks in two, it can contact the ground contact causing an igntion miss, or total stoppage.

 

[slyshar3]

Re: 72 evinrude 125 flywheel

Thank you

 

[John Bett]

Re: 72 evinrude 125 flywheel

72 rude, I had a '69 evinrude V4-85 recently that missed from time to time at idle and liked to die when I pulled the throttle down to idle after running at high rpm for a while. Its funny, because I could kind of control the miss by tuning the idle ajustment screws, but to keep it from dieing, I had to turn up idle to the point that it ran about 1200 rpm at idle, and to fast when aproaching the dock. The one thing that is similar to yours is that mine ALSO had 115 psi. compression across the board. I dont know if this helps or not, but good luck!

 

[John Bett]

Re: 72 evinrude 125 flywheel

One more thing I was just wondering, If your motor runs good for first 5 minutes with new plugs, it almost sounds like a fuel mixture problem. You know, there are 2 kinds of plugs you can run on these. the gap type plugs and the gapless. I ran gapless a while and had a miss from time to time at idle (on my 85hp) then looked in my manual and saw that there is a number for a gap type plug which it says is for sustained low rpm use, but I use them anyways and they seem to be ok.

 

[slyshar3]

Re: 72 evinrude 125 flywheel

I have used al sorts of different plugs, and the shop here said he went through the carbs. besides, the plugs look perfect, even after a whole season. If the mixture was bad, wouldn't the plugs look worse?

 

[John Bett]

Re: 72 evinrude 125 flywheel

Well, If he went through the carbs, I am stumped, but a really LEAN carburation could cause it and in that case, the plugs would look very clean.