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    Yamaha 130 has random miss at idle

    Is there a way to test this?
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    Yamaha 130 has random miss at idle

    Its the proper cyl. You can actually see the cyl # each tine it lights up. And 2 has the full scale like I said, and 3 just shows TDC. 4 jist shows TDC
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    Yamaha 130 has random miss at idle

    You have done nothing but throw out randomness, and try to be funny. The only wiring from the CDI is 1 wire to each coil, its numbered and has always gone the same place. So when you say its the wiring to #2 and #3 it seems as tho you don't know the set up of the motor, because if the CDI works...
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    Yamaha 130 has random miss at idle

    How can you make a comment pointing to the wiring on #2 and #3,implying it has a problem and then the next line point to the fuel pump? Makes me question the ranking method on this platform.
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    Yamaha 130 has random miss at idle

    Wiring doesn't just change, and the wiring would come from the CDI and both CDI boxes function other motor fine. . .timer base tests fine, stator tests fine. . .fuel pumps been replaced.
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    Yamaha 130 has random miss at idle

    Ok, so it seems like #2 cyl is never firing with the timing light, but #3 reads right where it should.. . # 2 coil will jump a 1/2" gap then become intermittent if you try to make the distance any further. The #3 will jump well over 1/2". As far as timing light changing when really misses, there...
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    Yamaha 130 has random miss at idle

    They are good, my wires are numbered on each. Can switch the CDI boxes motor to motor. Problem stays in the same motor.
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    Yamaha 130 has random miss at idle

    I can swap carbs with the other motor and it still happens, and good motor still runs good with other carbs. Key is still intact. Have inspected reeds, and they all seal.
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    Yamaha 130 has random miss at idle

    Yes, I'm aware TDC is marked on all, and #1 and #2 actually give a scale. I will go down and double check as I'm not 100% if we did or not.
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    Yamaha 130 has random miss at idle

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    Yamaha 130 has random miss at idle

    The error/miss lasts as long as a sneeze. Its about as long as the gap in time from one flash of the timing light to the next. We have watched the timing with no visible change when this happens. Did that yesterday. Along with checking the timer base, which came back in Ω and DVA specs. Im not...
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    Yamaha 130 has random miss at idle

    I'd say that's just in the recording, as the 2 motors sound the same sitting here running. Its like my phone cuts out the actual exhaust noise and picks up only mechanical sounds. When it misses and your standing here, its obvious, i recorded the video and its hard for me to tell when it does it...
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    Yamaha 130 has random miss at idle

    I guess my issue is the problem only last for a second, the motor loses around 200-300 rpm, and then jumps back up to idle. . then At some random point in tine does it again. Its not a replaceable problem to test spark or fuel during.
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    Yamaha 130 has random miss at idle

    Timing at idle matches good motor, right around 3° ATDC . . .So i have good spark, good timing, good compression . . .and I can move the carbs motor to motor, other motor still runs good with bad motor carbs, and bad motor still runs bad with good carbs. . .have replaced all gaskets as well. ...
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    Yamaha 130 has random miss at idle

    #1-141 #2-134 #3-140 #4-135 Also, when we test spark on the cyls both are able to jump a 7/16 gap. . .and both plugs seem to be wet. . . which would suggest the cyls are getting spark, and fuel
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    Yamaha 130 has random miss at idle

    I have a pair of 1996 yamaha 130 saltwater series on a 1996 24ft WAC w/30in bracket. My port motor has a random miss at idle and stalls/becomes hard to start at but only sometimes when on the water. I have done/tested. Stator Stator DVA. High Low Bad motor Volts...
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    1985 Johnson 120 Goes WOT then falls on face

    Ok, what about the process i described as far as checking the stator volts in previous message? Is it accurate? On second page of thread. . atleast on my end. Last thing
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    1985 Johnson 120 Goes WOT then falls on face

    You had said before a bad rectifier could fry the stator, can a bad stator fry a rectifier?
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    1985 Johnson 120 Goes WOT then falls on face

    I do not have a meter with a peak freeze, but with meter set to read up to 500v, only gives me a visible result of 86v from brown wires while cranking. Not, sure if this is accurate to the DVA test. All the numbers on the blue line highlighted below come back in spec, with the exception of the...
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    1985 Johnson 120 Goes WOT then falls on face

    Actually that was not stated above, ive asked the question, but it wasn't answered as to what having 12v there meant. I was told it shouldn't be there, but not what getting that reading actually means, or what it means is bad.
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