Motorcycle Repair: 1989 fzr600, infinite resistance, zero resistance

Question
i have no spark.pulse gen.ok stater.ok.when lite testing the coils red&wht. wires are hot,but so are the org&tan or gray hard to tell color.hhheeelllppp!!!

Answer
Hi Bryan...

Ok... let's try to narrow down the field of possible problems. First thing: by "no" spark, do you mean that all four plugs are not being fired? If 2 plugs spark, but not all 4, then the coil that feeds the two "non-sparking" plugs is prolly bad. If all four plugs are sparkless then please read on... Your bike has two ignition coils, each coil has a Red/white wire that provides 12v when the key is turned on. Yes, there will also be power on the other wires coming from the coils... that is normal, and the fact that you have power at the coils rules out the run switch being faulty. As for the pulse generator, well... the only way to test it is by unhooking the two wires at the ignitor box (they are the two wires that are white, one has a red tracer, the other a black tracer). Use an ohm meter to check the resistance of the pulser. It should be 80 - 120 ohms. Keep in mind that an open (infinite resistance) or a short (zero resistance) are an immediate cause for replacement. But you said you checked the pulser coil. This leaves four things that could be the trouble. The ignitor box, the sidestand switch, the clutch switch or the ignition/safety relay. The clutch switch and the sidestand switch are easy to check using an ohm meter. If these two switches are working then they can be ruled out. There is no reasonable way to check the ignitor box other than replacement (very expensive, especially if it doesn't solve the problem). To check the ignition/safety relay, you will need to get a Clymer manual for your year and make bike, and it will guide you to troubleshooting that unit. To be honest Bryan, the ignitor box is rarely to blame, the usual culprit is typically the sidestand or clutch switch, followed by that relay box...
I hope this info helps you get your spark back and your bike running!! Good luck my friend!!

Jack