Serial number is J90PLSSE. Motor is on a 22' crest pontoon.
-Motor starts strong. Idles good. Does have a slight hiccup while idling but nothing serious. Once I start throttling it it smooths out and runs great at trolling speeds. Once i get past trolling speeds and try to get on plane it feels like prop slip. The rpms rev slightly and it loses all power. Once I decrease throttle back to trolling or idle the power comes back. I thought it was prop slip and replaced the prop with a Turning Point prop 14x13 which was the original prop specs. The issue is still there.
-I did a compression check and all 4 cylinders were 100 psi even, and the motor was cold. However while I was doing the compression check I forgot to disconnect the plugs that feed the coils. So the plug wires were just hanging there and noticed when the motor was cranked that there were arcs coming from the boots where they connect to the coil. Like they were arcing through the boot. I inspected the plug wires and found that they have pin holes and one had a tear in it. Replaced the wires, but still same issue. The compression check was done at dusk so I was able to see the arcing clearly. I even took a slo-mo video of it doing it. But I did disconnect the coils after this to finish the compression check.
-I have gone through the carbs, they were sparkling clean but I cleaned them anyways, and ran wires through all the small holes. All throttle plates are in sync. Also went through the fuel pump/oil pump.
-I know its not the right way to do it but I checked spark by using an induction timing light while it had the muffs on. I know it should be in the water with a load but wanted to do an initial check. Going through the rpms with the light, all cylinders were firing at high and low rpms, and were matching up with their respective timing mark.
-What I am thinking is it could be slipping out of gear during those high rpms, maybe the gear shift cable needs adjusting. But I would think there would be more noise and more of a clunking sound if this was happening.
--Maybe I am losing spark at the higher loads. Maybe the coil/coils are breaking down?
--Maybe it needs to have the link and sync performed. However I do not have the OMC ignition analyzer it recommends. Is there another method or something that can be made to replace this tool?
Where is a starting point for diagnosis? I would rather not just throw money at it hoping to fix it.
-Motor starts strong. Idles good. Does have a slight hiccup while idling but nothing serious. Once I start throttling it it smooths out and runs great at trolling speeds. Once i get past trolling speeds and try to get on plane it feels like prop slip. The rpms rev slightly and it loses all power. Once I decrease throttle back to trolling or idle the power comes back. I thought it was prop slip and replaced the prop with a Turning Point prop 14x13 which was the original prop specs. The issue is still there.
-I did a compression check and all 4 cylinders were 100 psi even, and the motor was cold. However while I was doing the compression check I forgot to disconnect the plugs that feed the coils. So the plug wires were just hanging there and noticed when the motor was cranked that there were arcs coming from the boots where they connect to the coil. Like they were arcing through the boot. I inspected the plug wires and found that they have pin holes and one had a tear in it. Replaced the wires, but still same issue. The compression check was done at dusk so I was able to see the arcing clearly. I even took a slo-mo video of it doing it. But I did disconnect the coils after this to finish the compression check.
-I have gone through the carbs, they were sparkling clean but I cleaned them anyways, and ran wires through all the small holes. All throttle plates are in sync. Also went through the fuel pump/oil pump.
-I know its not the right way to do it but I checked spark by using an induction timing light while it had the muffs on. I know it should be in the water with a load but wanted to do an initial check. Going through the rpms with the light, all cylinders were firing at high and low rpms, and were matching up with their respective timing mark.
-What I am thinking is it could be slipping out of gear during those high rpms, maybe the gear shift cable needs adjusting. But I would think there would be more noise and more of a clunking sound if this was happening.
--Maybe I am losing spark at the higher loads. Maybe the coil/coils are breaking down?
--Maybe it needs to have the link and sync performed. However I do not have the OMC ignition analyzer it recommends. Is there another method or something that can be made to replace this tool?
Where is a starting point for diagnosis? I would rather not just throw money at it hoping to fix it.
