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    Johnson 70 hp 3 cyl / 2-stroke dies when giving more throttle

    Well you suggested checking reed valves, and I did. I checked spark at all rpms ( no load,) incl gap test, all ok. Load test is not possible right now as the boat is on land and I find it hard to believe the spark will change under load? I ran out of ideas, thus the posted question. Please...
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    Johnson 70 hp 3 cyl / 2-stroke dies when giving more throttle

    I now checked the Reed valves. Pictures attached. To my surprise, valve 2&3 (counting from top down) have tiny gaps, enough to see some light anyway. But not number 1, which is at the carb that spits fuel backwards. Strange to me. All looks clean and in very good shape, sealing was ok. Ideas...
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    Johnson 70 hp 3 cyl / 2-stroke dies when giving more throttle

    Thanks. Will check these points. Is it likely that the Reed valves can just be cleaned and aligned? Or are they often broken? Since they are just flat metal pieces I'm not sure how they would brake. It is clear that just one carb spit back fuel, I guess this is nit affecting idle too much but...
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    Johnson 70 hp 3 cyl / 2-stroke dies when giving more throttle

    Ok, sorry, Now I get it. English is only my 3rd language so bear with me ;) Will test these 2 things. Any thoughts about the "gas spitting" from top carb? A clear difference from the other 2. Some fuel is actually running slowly down the inside of the air liner box.
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    Johnson 70 hp 3 cyl / 2-stroke dies when giving more throttle

    Thanks. VRO pump removed, new pump installed which we think is ok as manual fuel pumping gives same effect. Do oil is mixed in fuel. Fuel tank and line is brand new. I understand your suggestion, but seems very hard and risky to try to use the lamp, at sea, at speed. And probably very hard to...
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    Johnson 70 hp 3 cyl / 2-stroke dies when giving more throttle

    Hi folks, can't solve this one, help would be highly appreciated! Johnson 3 cyl 70 hp, 1986. Starts easy, runs well on idle and slow speed, responds well and even on throttle when not under load (when tested on land). But when throttle gets to about 50% and under load (running with my 20 foot...
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    Hi again folks, many thanks for all replies and suggestions. Unfortunately I still have the same problems. Johnson 3 cyl 70 hp, 1986. Starts easy, runs well on idle and slow speed, responds well and even on throttle when not under load (when tested on land). But when throttle gets to about 50%...
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    We just found a faulty ignition cable to one cylinder. It was good enough to allow a spark, but resistance is way to high. Out theory is that the spark is nor strong enough once the advance ignition steps in, which is exactly when we loose power. Our initial test was just spark yes/no, I...
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    10.5 to 11 bars on all 3. Good.
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    It's new to me. Bought and tested it last fall, ran well, installed on new boat and the problem started directly. I'm 99 % sure the carbs are clean. Can the ignition arm movement be incorrectly adjusted, after disassembly and assembly of the control wires? So ignition is adjusted too early or...
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    Thanks. We tried manually to pump but no difference. We even bypassed the vacuum pump and only pumped manually. Yes the lawnmower pump is also a vaccum pump although for smaller engines. But from what we see, OEM pump is the same size from 10 to 115 hp so probably not critical. And the behavior...
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    Thanks, good idea. Will try today. Might be hard as it dies so quickly, but worth a test. Could it be relayed to the mechanism for variable ignition? The whole assembly moves easy back and forth, and start to move approximately when the engine starts to hesitate. Is it correct that it only...
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    The issue comes quite distinctly at a certain throttle and under load only. If the pump was not giving enough fuel, this could be the reason, so thus the test with another pump. But no difference. And no difference when manually pumped to the carbs. Ignition issue most likely?
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    Compression 10 on all 3 cylinders. Don't have a spark tester but will get one. On idle and up to mid throttle, all 3 have spark.
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    The VRO was on but oil inlet plugged. We suspected it to be faulty, so installed a standard pump from lawnmower. But exactly same behaviour.
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    Evinrude 70 hp 3-cyl 2stroke dies at high throttle

    I tried to find the reason for my problem for weeks now but failed.Please help! Have a 3 cyl 70 hp from 1986. It starts well, runs very well on ilde and slow speed, responds well and even on throttle when not under load ( in neutral or when tested on land). But when throttle gets to about 60%...
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