1979 Evinrude 100 100999s problems at a loss.

[Emohohen]

New to me boat my first is a 1980 aquasport family fisherman with a 1979 100999s evinrude 100. Been running down an erratic miss found that the stator was only putting out 80v DVA compared to the 150 to 400 it's supposed to replaced that and two failed coil packs on 1 and 4. The rest of the cdi test out positive. I've cleaned and rebuilt the carbs floats and all. New fuel pump not the kit the whole pump the old one was JB welded with a pipette to hold it together. New champion plugs gapped at .30. Link and sinked about 30 times now. Compression tested all 4 and all even at about 110 to 120. Set timing to 4 and advanced to 28. The issues I am stuck on right now is that I cannot get it to idle the only way it will is if I hold the timing linkage to full advace even after its warmed up no change. I checked the jets and they are right in spec so I'm just dead stopped for ideas. Any info or advice would greatly be appreciated. I really need help with this.

 

[racerone]

Do you have spark on all 4 leads that jumps a gap of 7/16" or more , yes or no?------Pull the bypass covers and inspect pistons / rings.----Six small screws each and 4 cheap gaskets.

 

[Emohohen]

Yes I have a good spark tested that yesterday had to get a gap tester. I have not pulled the covers yet was hoping the issue wasn't that deep but I can and will if need be. It runs fine at high rpms but just wont idle it dies the second I let down the spark advance lever. Couldn't find any vacume leaks to the best of my abilitie. I did notice that the port side is by touch just a bit cooler than the starboard while running not entirely sure that makes a difference but trying to give you all the info I've got. I'm very new to boat motors.

 

[racerone]

Report back after inspecting pistons / rings.-----Are you testing on a boat or hose on the trailer ?------Runs fine at high RPM in gear on the lake , yes or no ?----Orange wires are going to the correct coils ??

 

[Emohohen]

Out of curiosity what would be the problem with the pistons and rings if I have even compression and I'd say fair at that? Tested on muffs and in a tank since the latest repair of the new stator. Been on the lake testing a few times too but not since this latest repair. So no not on the lake that I know of right now just because I haven't taken it back out it did okay before but had an obvious random misfire which has been eliminated. The orange wires put backthe way I found them I can retrace them later today. Will probly use a camera to check the pistons today sometime too only because I dont have a stocked part supplier near by. Thanks for getting back to me.

 

[Emohohen]

Went though checked the wires from the stator and the coil packs no issues. Inspected the the pistons rings block with a camera no visible issues. Got to thinking perhaps a leaf plates issue went to take off carbs to inspect and a buddy squeezed primer the ball and no pressure so we took the carbs off opened them up and found the new Karbay Carburetor Repair Kit For 439076 was trashed. I completely overlooked it thinking it was brand new how could it have possibly gone bad but it sure enough it did. Not running anything but premium and west marine 2 stoke oil so figure just bad rubber bad brand ording Johnson Evinrude now. Put the old float bowl gaskets back on for now the only things that were still in good shape from the first take down. Starts right up no timing issues idles fine, lake test as soon as the weather allows. But I think we found the issue. Lesson here I guess is KISS "Keep It Simple Stupid".