Quote:
Originally Posted by Withers79
After a little advice - I have an intermittent fault on my Suzuki DT65 (1998) outboard where by when it is warm and I throttle off it will miss fire, then idle fine. When I throttle up it sometimes cuts out. It always then starts on the key and it may take a few attempts to get through what ever the issue is and get the revs on. I have had the carbs cleaned, balanced, new fuel lines and pump so now going down the electrical route.
I tested the coil packs over the weekend and got the following resistance readings -
Top
Primary - 0.8 ohms
Sec - 11.75 ohms
Middle
Primary - 0.8 ohms
Sec - 11.37 ohms
Bottom
Primary - 0.8 ohms
Sec - 11.03
I have some photo copies of some data from the manual, and if I have the right one the limits are
Primary - 0.1 to 0.3 ohms
Sec - 10.0 to 15.0 ohms
Seems hard to believe that all three coils are out of limits and that I'm getting a consistent 0.8 ohms for them all? Appreciate that the info im giving is limited but any advice would be appreciated.
Withers!
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Even a very expensive high impedance multimeter will struggle to read less than one ohm accurately.
TBH those readings look fine, however, your problem is more likely to be the coil insulation breaking down and causing tracking.
The only real answer is to get a known good coil pack to try on each cylinder, or work out which cylinder is missing and move the coil packs around to see if the fault moves with the change..
My first action would be the change the plugs.