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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    At the top it shows 3.360 Bottom 3.373 So with a bore of 3.375 we can see the clearance that the factory accept. Compression was 125 and 128psi
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I totally agree and I totally agree and speaking from experience I do remember installing pistons and rings the I thought were borderline good and the end result was not the best compression. I don't have much experience using oversized pistons. That said what do you recommend in this case...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    https://forums.iboats.com/threads/1990-force-120-cylinder-bore-help.373694/ This thread mentioned what I stated So now I want to know what I can do short of getting another engine. The one thing I still don't know is the oversized rings, I goes to get closer to the ideal gapin an oversized...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I couldn't wait so mine is a B so 3.375 standard. I should have all the way to 3.410 to install up to .030 oversize pistons right? I could be wrong but this is what I read.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    https://maxrules.com/models/forcemodels/90_150.html I have to look it up in the morning based on the serial number
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Thanks for that I think I understand it. But if I have the A model then the motor is junk. Bor at 3.312 is way below the .030 max oversize piston posibility. But the B or C models can be bored to within the oversized specs since the standard sizeis 3.375. I did not see any listings for 120hps...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I read a bit about the 1990 120HP engines so there were 2 different ones. The A 120s had the 3.312 bore size The B and C modelshad the 3.375 bore size. Both my engines measured below 3.375 before the honing. Right arounf 3.370 So am wondering which model I have? If it's A then the cyls have...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    You said the standard pistons measure 3.65 at the rings so an oversized one should do better. There has to be a piston size to fit in the 3.3820 bore? I was under the impression that if standard is 3.375 you can get ovwrsized up to .040 You are right I have read a lot but I obviously need to...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    3.365? 3.375 is standard right? I measured and it is 3.3820 all the others are 3.375. What is the point of oversized up to .040 if they woun't last? If this one won't last the other ones should not be far behind.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    So if I take it to a machine shop, what pistions and rings should I get. I mind aswell bore them all then. But I need to buy the stuff before hand right? Mind aswell surface the head and block. I'd like to be able to get away with tye least expensive scenario if possible.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I already honed it to get rid of the issue. The top ones are also honed. So I cannot use standard with oversized rings .010 on 1,3 and 4 and .020 on 2?
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Ok so after honing I measured tye end gap on all 4 cylinders and 1,3 and 4 have .016 throughout while the one I had to hone deeper is .035. So .019 difference in gap #2 measures 3.3820 now. Otherones at 3.375 now
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I did the honing the damaged are disappeared on number 2 it took 10 minutes with tye 240 stone hobe. I have not done the flex ball yet. By the way the #1 piston when I took it out a1/2 inch piece of the top ring was broken off and fell out. Do I really need new pistons for all, can I buy used...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Does anybody know what this part is. It came off when I removed the engine.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Ok so everything is out Only 2 things that were a pain thebflywheel and the cover that allows acces to the bolts that face down. It was frozen into place and I had to heat it up. So for the first time doing this one I thing I did good. Only broke 2 bolts. Odf thing was when Intook the adapter...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Thanks for that, good to know so being cast iron I don't need the aluminum oxide hone? I can get the Silicon Carbide right? Ok I got the flex 240 grit 3.5 size Silicon Carbide. I will get a 4 inch stone hone from Harbor freight but they only have the Aluminum Oxide.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I would snap-off if I don't use snap-on right?
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    A 3.5 ball hone aluminum oxide should be enough right? This is an aluminum cylinder right? Or did you use the regular type? And the grit, did you use one size? I never used the flex always used stone în the past. And do you do dry honing or honing oil, 10-30 oil,Water etc
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Ok so what do you think about my measurements of tye cylinder walls? I posted it above. The second engine is the same. I want to try to hone. You said stone hone. I shared a video above where the guy advices against it and shows why, he uses the flex hone.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    This was the newer flywheel. The one from the second engine looks like it's an original 1990. Don't even wanna think about taking it off right now.
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