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    Yamaha 90 2 Stroke No Spark

    Today I took readings again. And again the charge coil resistance tests showed odd results. 22,000 ohms. Yet the engine did spark. I connected fuel, ran engine for 10 minutes, no failures. Totally stumped, i checked resistance again on charge coil and got 74 ohms which is almost bang on what...
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    Yamaha 90 2 Stroke No Spark

    Thanks. Never heard of that switch, don't think mine has one but will double check. Any idea what the technical term would be? Would make researching it easier. Mine is a 2010 so if they ever did put those on the Yam 90A 2 stroke, I'd expect mine to have it
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    Yamaha 90 2 Stroke No Spark

    Thanks, that's a good shout! I don't think I have seen one mentioned in the service manual but will do another careful check. I also heard there's a neutral sensor in control box that can prevent starting if stick isn't in neutral. I am pretty sure that wouldn't allow the solenoid to kick the...
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    Yamaha 90 2 Stroke No Spark

    Struggled to follow any of that! Let's start with.. what's a TPS?! Certainly sounds like some ideas to look into,. thanks
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    Yamaha 90 2 Stroke No Spark

    Thanks, I appreciate you trying to help. Those things have all been checked and ruled out. I am sure I have read posts on this board in the past about this engine, from what sounded like very knowledgeable people. But they could have been 10+ years ago now! Ho hum, worth a shot. thanks again
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    Yamaha 90 2 Stroke No Spark

    They may well do. To which I would reply "Sadly impossible, so can my readings be assessed and a guess made as to what I could take a stab at replacing first". My Fluke meter measures resistance and voltages accurately, any knowledgeable person will know enough from my readings to make some sort...
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    Yamaha 90 2 Stroke No Spark

    Anyone know if there's an experienced Yamaha engineer who would take a look at my readings and give me some advice (paid of course)?
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    Yamaha 90 2 Stroke No Spark

    Thanks. I only did the CDI readings because I thought I might as well, wasn't sure about it anyway. The main point was the other readings, all those coils. I had a guy rebuild the carbs for me a few years ago, he's been a Yamaha approved repair agent for 30+ years so he knows his stuff. I...
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    Yamaha 90 2 Stroke No Spark

    Would be very grateful for any replies here. Things have 'progressed' a little, no solution yet but I tested all the components (pulser coil, lighting coil etc) both for resistance and voltage when cranking. I will post the results below in case anyone knowledgeable sees anything useful in these...
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    Yamaha 90 2 Stroke No Spark

    Hi all, I've seen a few other threads about this which didn't quite match my scenario so I thought I'd post my own in the hope of some diagnostic suggestions. I have a 2010 Yamaha 90A (AETO). It has no spark. Was running perfectly and just shut down, wouldn't restart. I am no boat engineer but...
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