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so, apparently there are 4 different shims? https://www.boats.net/catalog/omc/sterndrive/5-70l-350-cid-v8/574amkwb-1986/upper-gear-housing 0911 (678-681). they are all very similar aside from thickness/color. I took mine apart to check bearings and tore my original. its an orange color...

you have good compression. thats a big one. you are down on power. thats a big one. you've exhausted all your other options as you have stated including reed valves. you likely have an issue in the short block. possibly a spun bearing.

I will say that the clymers manual sucks really bad lol. it literally says "use an engine analyzer" for electrical component testing....really?? sigh...thank god I only paid $15 for it shipped.

so my 1975 15hp evinrude I finally got the manual in for it. did some more tinkering. instead of spark only on the lower cylinder, I now have very weak spark on both cylinders. Either today or tomorrow I will recheck with a proper plug gap tool (but my wife wont really let me do what I want...

I swapped the coil lead wires and spark went from the lower cylinder to the upper cylinder so I assume both coils are good. I popped the wiring loose from the points and coils and ohm'd the wiring and that is good. I assume one of the condensors is bad. will play with that later on. I also...

I just went ahead and ordered a spark gap tester off amazon (adjustable one) and it should be here tomorrow. I will go outside shortly and see if swapping coils causes the spark to move or not. if it moves, then the coil is bad right? if it doesnt then its likely the points or condensor right...

I mean if I have to keep buying tools just to troubleshoot this engine, I'll just pull it off and put the 95 gamefisher 15hp I have on the boat. I wanted to keep this engine though as its original to the boat and I consider it "part of the pair" that inherited from my grandfather.

lol FML...the clymers is even what the local library has...

thanks! will read this! also bought a used clymer service manual off ebay yesterday

the lower plug will jump the gap on the autozone spark tester I have but as said earlier, its a fat yellow/orange spark which is weak.

hmmm...making progress. no spark on top cylinder but looks like fat yellow spark on the lower one. for cars that would be a weak spark but not sure on this little thing?

I mean overall there's nothing to this thing electrically. magneto to coils and then to the kill switch. bypassed the kill switch. cleaned the magneto ground and coil grounds...sanded the points and set them to .020...tried to check the condensors and they both sit around .02 (no 0 or...

this is some of the info I was looking for. yeah, the gaps are massive on the points lol. well over .020... I'm trying to figure out how to test the coils and condensors. I found the grounds and cleaned them all up. the videos I see on youtube for the condensors want you to use uF scales...

anyone know where I can find one online? local library copy is apparently eternally checked out. I'm trying to trace the engine grounds and such as I have a no spark situation. also, plug gap specs, etc, etc. just trying to cross all my T's and dot all my I's... found this link...

what type of transmission fluid? Im not supposed to use marine gear oil in it?

yeah too bad as I went out to do this very thing, I decided to tap on it again a couple times and the handle literally crumbled to pieces lol. I just pushed it through into the cowl a couple minutes ago and got the cowl cover off. looks like I'll be ordering a new latch off ebay... on another...

starting on the restoration of my grandfather's old 12' 1976 scout john boat. its got a 1975 15504C 15hp evinrude on it. hasnt been touched and sitting on back of the boat since 2006...yay! sigh. the engine cove latch is completely frozen. I've been hitting it with PB blaster past couple of...

maybe someone who is more familiar with the new forum layout can help. I posted a thread several years back asking for help ID'ing some outboard and I/O setups. We finally cut one of the I/O setups up to sell it and I was trying to find that thread as it was identified in it for me. I've...

2014 suzuki 115 4-stroke with maybe 30 hrs on it? Its not peeing while running but at the same time not overheating either. when I have the hose hooked to the side port to flush it, water will come out of that port though. Its not the first time its done this either. it only had about 10 hrs...

So I took my shorted 3a breaker for my bilge pump to my dealer and the parts counter took one look at it and asked "Carolina skiff?" Yup was my response. They asked which breaker and I said bilge pump and a sigh just goes across their face. Apparently this is a common issue with Carolina skiff...