I read 194ohms between the two trigger wires on the 200ohm scale. I'm not exactly sure how to check a coil properly but this is what I recorded. With coil disconnected from the circuit : 4.4 ohms between the two pins on 200ohm scale. 11.8 ohms from the spark plug boot to either pin on the 20kohm scale. The boot and the two pins read open to ground. I also checked the wire from the CDI to the coil and it read 0.3ohms or so, disconnected from both ends. Also, I don't know if this means anything or just confuses things, but when I disconnect the blk/yel from the coil and leave the pink connected, I read 102ohms from the blk/yel pin on the coil to ground.

 

194 ohms sounds in the ballpark to me for the trigger winding.

The 4.4 ohm primary resistance sounds high to me based on other quad designs, but it isn't necessarilly bad. 11.8 ohms on the coil secondary sounds OK. My quad has a non removeable resistor cap which read about 8000 ohms, but I've read on other forums where non resistor cap coil secondary resistances are in the 12 ohm range.

If it were me I would try to measure the trigger voltages with a meter with a lower AC full scale then 200 VAC. I would like to see if it really is 0.10 VAC with a little more resolution that one least significant bit (LSB). With the LSB at 0.1 volts, the difference between 0.00 true volts and 0.10 true volts can be next to zero.

If possible I' try adjusting the pickup coil closer to the flywheel (but still not colliding with any raised bump on the flywheel) to see if that makes any difference.

Then it might be down to making educated guesses. I'd start with the CDI, then the coil (assuming nothing major sticks out in the above two paragraphs).

 

I will try to measure the trigger voltage on a lower scale but the trigger coil is stationary(unless I jimmy-rig). I have been looking into a CDI. I will post the outcome. Thanks a lot for your help.

 

Hi I'm having a similar issue with my 2x4 fa d300 buyang atv. It's strange . I get spark . It runs and drives,then ideling it will die . Then Start up and run. Or it won't get any spark hours or days. I've checked all my connections. I've used my multimeter to get readings on my ignition coil , spark plug boot/Cable. The kill switch is missing from the handlebar when I got the quad. Any help would be greatly appreciated