The engine is on a 2004 Yamaha Raptor 660 ATV. Ran fine for many years. Now, no spark.
The coil was very accessible, and the manual gave instruction on how to measure with an ohm-meter.
The primary coil is measured from the base (ground) of the coil to a terminal opposite the spark plug lead. It should be 0.18 to 0.28 ohms at 68 degrees F.
The secondary coil is measured from the terminal to the spark plug lead. It should be 6.32 to 9.48 K ohms at 68 degrees F.
I forget if it was the primary or secondary, but one of them was an open circuit.
I am using my Klein MM700 multimeter.
So in comes the new coil. I measure this new coil and find the primary to fluctuate between .2 and .3 ohms.
Close enough.
But the secondary, terminal to spark plug lead is crazy. The meter fluctuates like crazy and eventually settled in (more or less) around 2.5 K ohms. (too low)
I often visit www.raptorforum.com (ha more often than I like) for help on this ATV.
There are a few moderators over there that are really good. Of course the coil question comes up.
The mods over there insist the ‘meter can’t accurately measure down at the less than 1 ohm area.’
Is this why the meter jumps around so much? If so, I thought my new Klein would be up to the task.
The ATV is about 2:30 away. We’ll bring up the new coil and give it a try in a two weeks.
Any thoughts or comment on measuring the resistance of the coil?
Thanks
Dale