...Details : 1978 R 100/7 with Dyna III ignition. I've heard that with these Dyna set-ups you can't just pull one plug wire off to see how fast the other cylinder is running. I used to do that on my Slash Five but I don't want to take any chances with this bike. What's the best way to isolate one cylinder to check the speed of the other one ?? Hope this makes sense, thanks in advance.