As an electrician, I once though I could measure the volts across a 4 cylinder vehicle ignition coil. I quickly learned the limits of my meter in regards to voltage as it instantly became a useless pile of plastic. NEVER try to measure the volts of an automotive ignition coil: The voltage is in the range of 10's of thousands of volts. I believe the car I was working on was rated at around 30 or 40,000 volts. I'm new to quads and own a 500 Quadmaster now. I'm not sure what the voltage being pushed to the plugf is, but I'm sure as heck going to research it before I stick my $400 Snap On meter to it. But that story brings me to another point I've long been making in the mechanics realm, but is especially true to CDI boxes on quads an such. OK, so a coil can have its resistance measured, or "Ohmed Out" on a non-energized circuit (another great way to turn a meter into rubbish is to measure Ohms on a live circuit.) NEVER MEASURE OHMS ON LIVE CIRCUITS.. However, a CDI box is not so easily measured, as there's much more going on in there than the easily measured electrical properties found in a simple coil of wire. With capacitors, diodes and so on, how is it best determined whether you're getting enough spark? If there was a sure proof way, like ohming a coil to know your spark, this "fuel" issue could've instead been an "Electrical" issue, no?