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

    Ok found a machine shop with a guy that told me to get the .020 since he didn't measure it he said that is safe to get the 0.020. But I measured it and want to get the 0.010 Only number 2 has been hone to do understand the damage. Also he said to do them all. So do you guys think I can get...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Can I do on OS the rest standard
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

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

    So I am thinking to take the block to a machine shop to do proper boring but I need to buy the OS piston and rings first. Which size do I get based on the measurements, .010 or bigger?
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    My dial gauge is not top notch so ball park set it at 3.375 and went up and down from there On #2 some minor error adding .00005 Don't know how the telescopic dial found 3.381
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Ok so I need to do this properly, so I am following this video to use a micrometer and dual gauge and see tye real status of each cylinder. I zeroed everything. I will set it at 85mm and see what's going on. I am sure it's out of round more than .002 So honing is in order. On #2 I want to see...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I think I need the .010 which will he bigger than my bore at roughly 3.3820. It will he bigger which means I still need to take of some material. The bore has to he 3.385 right?
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    yes bottom is 3.373 +- .001
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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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