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    Help 1981 Johnson 25 surging

    I apologize for any disrespect. I thought my post was as humble as possible. I simply want to learn from more experienced mechanics and to understand how functions of different parts could cause my issues. I greatly appreciate your time and help. I too do not like throwing new expensive...
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    Help 1981 Johnson 25 surging

    No longer confused. I did look at parts blowup. Parts ordered. Wish they had a complete rebuild kit vs individual parts. Please correct me if wrong. If the vent side o-ring was bad wouldn’t the tank not pressurize when hot? It does, so does that indicate that the vent o-ring is good? The...
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    Help 1981 Johnson 25 surging

    Not sure if it matters. When the new fuel hose is connected there is about 1/16 gap between the hose connector and the fuel tank/engine.
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    Help 1981 Johnson 25 surging

    Yes. Both stick out same amount.
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    Help 1981 Johnson 25 surging

    I’m confused. I took the outlet assembly off. I don’t see any o-rings.
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    Help 1981 Johnson 25 surging

    Nope. I didn’t know there were o-rings in there. It was leaking from under the outlet block(?) where there is an obvious cork gasket. I tightened the 4 screws and leak stopped. I wanted to take the block off but was worried that it’s nuts and bolts not screws. Wasent sure how I was going to...
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    Help 1981 Johnson 25 surging

    Compression is 120 top cylinder and 125 bottom cylinder, wet.
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    Help 1981 Johnson 25 surging

    Here are the plugs after running for a bit as described above.
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    Help 1981 Johnson 25 surging

    Yes high speed jet in bottom is clean and clear.
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    Help 1981 Johnson 25 surging

    Oh. I also checked inside the breather box. It is clean, no fuel splatter.
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    Help 1981 Johnson 25 surging

    Photos for reference.
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    Help 1981 Johnson 25 surging

    Thank you for the reply. The hose and filter in image are new. I separated the hose, after the filter, and squeezed the bulb. Seemed like a lot of fuel flow without restriction. The motor surges when tank is full or almost empty, and when the tank is hot from sun and pressurized, when first...
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    Help 1981 Johnson 25 surging

    Hello all and thank you in advance. Just returned from overseas (military). Had my ‘81 Johnson 25 Model J25RCIM in storage, winterized. Cranked first pull. PROBLEM: fuel lines were dry rotted and leaking REPAIR: changed fuel lines Ran great for a few trips. Then, PROBLEM: severe surging at WOT...
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