1990 SuperJet One cylinder not firing. Ignition coil is testing fine

[IceAxe]

1990 650 SuperJet fully sank after being swamped by boats for a few hours at the dock. Compression checked cylinders and they are good. Cleaned, drained tank and all lines, new gas, oil In the cylinders... the typical works after sinking a ski.
When starting it’ll start fine out of the water, but starts lazily in the water. It’s only running off one cyclinder (pulled the “aft” plug cap and ski continued to run, pulled “forward” plug cap and ski died). Figured it was either my ignition coil or spark plug wires. I ordered a new ignition coils but it’s damaged or my multimeter is jacked up. My old coil and wires tested good to what I can’t tell - about 4.1Kohm.
I’ll order a new coil, but beginning to think it may not be a coil( since the ski will actually fire up) or a plug wire issue. Please help.

 

[DylanS]

Definitely try the new coils and make sure your spark plug wires/booties are in working order. I had an issue similar to this with coils that tested good but were actually the issue and needed replaced. I forget what year it is but one of them have spark plug cables with very thin stranded wires in them surrounding a carbon core. If yours look like that I’d suggest replacing them as they tear easy and I’ve had issues with them before. Good luck!

 

[DylanS]

1990 650 SuperJet fully sank after being swamped by boats for a few hours at the dock. Compression checked cylinders and they are good. Cleaned, drained tank and all lines, new gas, oil In the cylinders... the typical works after sinking a ski.
When starting it’ll start fine out of the water, but starts lazily in the water. It’s only running off one cyclinder (pulled the “aft” plug cap and ski continued to run, pulled “forward” plug cap and ski died). Figured it was either my ignition coil or spark plug wires. I ordered a new ignition coils but it’s damaged or my multimeter is jacked up. My old coil and wires tested good to what I can’t tell - about 4.1Kohm.
I’ll order a new coil, but beginning to think it may not be a coil( since the ski will actually fire up) or a plug wire issue. Please help.

Oh and MAKE SURE to check under your flywheel cover. Could’ve leaked water and could be sloshing it around inside when it’s running or caused damage to your stator/magnets.

 

[IceAxe]

Thanks Dylan.

It actually turned out that my reeds were destroyed. I haven’t installed them yet but hopefully that’s the issue. I do have the Sapir coil now too just in case.

 

[DylanS]

G

Thanks Dylan.

It actually turned out that my reeds were destroyed. I haven’t installed them yet but hopefully that’s the issue. I do have the Sapir coil now too just in case.

Glad you got it figured out!