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

    So I hit another snag trying to take out the flywheel. The 3 holes that they provide size M6x1.0 are a freaking joke. Who the heck engineered this for a used stuck corroded flywheel to use those size bolts in aluminum. They basically got pulled out instantly so I made the holes bigger and...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    The second engine measured the same. Only did number 2 cylinder that had 110 compression. I looked at it close and there is some build up of aluminum. It feel above the walls when I use my nail. So the one spot that has one palpabile scratch it is between 2 high spots. The telescoping gauge gets...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Ok these are the measurements. Errror of .001 or .0015 could be there.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    These are the specs in my book which is for a 92 but should be the same I think. Is 3.375 max or standard?
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Will get back to you after, thanks for the input.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Found this older thread I hope mine is not already oversized. https://forums.iboats.com/threads/1990-force-120-cylinder-bore-help.373694/
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Now to the cyl wall findings. It is scarred. Can honing clear it? What type hone flex, stone or brush? From What I read the ball hone is the best. The other 2 get stuck and can cause pitting. They use muriatic acid to get any caked aluminum off. Then they use honing oil for the surfacing. Hope...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I ordered a snap on 6mm and a Gearwrench one.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I ordered a Snap on hopefully it will do.
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    You don't think Gearwrench will cut it?
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

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

    Ok I am stuck at the connecting rod bolt. What the heck size is that? Is it a 12 point or special size? It's smaller than a 7 and bigger than a 1/4
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    opened it at the same time
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    I agree this boat is new to me and I did not check it properly when I got it, my bad, but I am in the habit of fixing everything I get. I already changed the dash gauges and actually resurfaced the whole area. he fishing season started. I was doing other things like a trailblazer rebuild, 12 BMW...
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Thanks. Once I measure the #2 cylinder after cleaning it I can see if it needs to be bored. I can probably hone it. Any idea what size pistons these have I see .010 all the way to .040 but what is stock? This piston just started to get damaged.
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    1990 Trophy with twin Force 120HPs need help on timing and idle adjust

    You were right. Apologies
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    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    So I was on another thread and was asking about timing one person told me I might have engine issue to which I said no way. Well it turns out he was right this is a dual 120HP 2302 Trophy. Haven't taken it out since last year and I had the 2500 RMP discovered the plate was not adjusted right and...
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    1990 Trophy with twin Force 120HPs need help on timing and idle adjust

    So I opened it up and the piston in number 2 had some damage from the knocking. Maybe I should start thread with that problem
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    1990 Trophy with twin Force 120HPs need help on timing and idle adjust

    You were right cyl number 2 read 0 or 5 compression on one engine and 110 on the other. Is this a headgasket issue or piston rings and/or cylinder. All the rest read between 125(1 and 4) and 128(for the number 3). The plate on the lower carb was causing the 2500 RPM but cyl is bad. I have to get...
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    1990 Trophy with twin Force 120HPs need help on timing and idle adjust

    OK I just got a picture sent from one guy with one of the manuals and the 120HP that has the Prestolite ignition needs to adjust to 28BTDC. The thunderbolts are at 32BTDC. That is great to know. I initially put it at 32 but did not run or turn it on. I will go change and do the compression.
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