On the right track?

[paw2000]

Force 125hp 1988 poor performance. I posted the other day about a stator issue, the stator ohmed out good, also trigger values good. I pulled the flywheel and found the rim magnet coming off. Clean and epoxy it in place. I'm not getting a good spark on #2 (used induction timing light to verify spark). Symptoms are engine starts fine, runs on muffs fine, stalls when in water at dock. Once running and warmed up, seems fine, put in gear and pull away. after no wake zone accelerate to speed and would not get up on plane, throttles at wot and fuel is good(squeezed fuel bulb). Seems like motor has hit an rpm limit.

I pull the boat and retested the electrics, testing coils, primary(white lead to ground ) i got about 2 ohms, the secondary side( ground to spark plug lead) I got about 1000 ohms on #4 coil the others not able to measure. I reassemble and cranked the motor by hand( plugs removed) and I got a spark on all plugs. Am i looking at bad coils? A weak spark, enough to run the motor at slow speeds but not enough to run higher speeds?

 

[jerryjerry05]

Re: On the right track?

Do a compression test and post the results.J

 

[paw2000]

Re: On the right track?

I did a compression test, all 4 cylinders are close from 135 to 140psi. Plugs pulled after it was running and all were oily. The tub i run the motor in has oil droplets from the premix. So if a cylinder or 2 wasn't firing i guess it would load up the oil. When I took it out Thursday, it had a lot of initial smoke while warming up.

A timing light on each plug shows it firing, but it might not be "hot" enough. only 1 coil was I able to read the secondary winding resistance. I don't have access to spare coils so I need to replace them all, just want to be sure.

When the motor started running poorly it happened quickly. I had run 7-10 miles out and was fishing, weather got rough and we were dragging anchor, so we headed in, and then it started running poorly. If it was a fuel problem I would think I see a lean condition on the plugs not an oily condition.

Any ideas appreciated, if someone has a used ignition assy for testing I would pay to use it for testing and cover shipping both ways.

 

[paw2000]

Re: On the right track?

40 gals of fresh gas added and ratio is 50:1, also gas is from local truck stop not a marina so water isn't an issue