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Discussion Starter · #1 ·
After months of normal riding, my 97 Marauder just refused to start one day. It turns over but won't fire either spark plug. I didn't have a decent multimeter much less a peak-hold meter, so I swapped out the ignitor with a used one, no change. I Checked the output of the signal generator (magnetic pick-up) and no 1.5 V, so I swapped it with a used one, again no change. I had already changed the plugs. So last time I was poking around with it, I noticed that the ignition magnet on the rotor seems to have very little magnetism. Not enough to hold a small box-end wrench, or even offer much resistance when pulling it off it's surface. I got a cheap peak-hold meter and checked the original signal generator that was originally on my bike. By waving a very strong fridge magnet close to the pick-up, I could generate a small voltage on the meter, but it wouldn't trigger on it to see what the max value is. Has anyone every run across issues with the ignition magnet on the rotor becoming too weak to result in a spark? How strong a magnetic flux should it have without checking it with specialized test equipment. For the record, all connections and fuses have been checked, other than the ignition switch and kill switch, there are no interlocks that should affect the output of the pick-up, and the battery is fully charged and healthy.
 

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Discussion Starter · #3 ·
Thanks for the welcome and feedback Larry. I did ohm out the signal generator and it's 244 ohms, pretty much mid range for a serviceable part according to the service manual. I wish I could be so lucky as to pick up a new rotor as cheaply as you did. Mine new seems to be more in the $600 range, and that may not be a genuine Suzuki part, so you see why I'm reluctant to buy one to find out if that's the problem. Usually a coil either works or doesn't work (open or shorted), so the fact that I can generate a pulse from it at all seems a good sign. I just expected the rotor magnet to provide noticeable pull on something like a small wrench, similar to your average lawnmower. The generator magnets inside the rotor sure do. I can barely notice any pull at all. Going to check out voltages down-stream to see how they compare with the nominal 205 to the coils I'm supposed to be getting. If anyone has an old rotor out there I sure would like to know how strong the magnet is .
 

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Discussion Starter · #5 · (Edited)
Thanks for the info Larry. I checked the signal generator I have in my bike again tonight, and the one that was originalrealy in it and they both ohm out within range so I decided to start at the other end and work back.

I checked the voltage to the primary of the coils and got no reading at all. The coil primaries ohm out within tolerance, they're just not getting anything from the ignitor box.
Checked the voltage input at the ignitor and it has its 12 volts +, but the input to the ignitor from the SG reads 0 volts.
The SG ohms out within tolerance as did the original I took out of the bike.
There's nothing between the SG and the ignitor but one connector and a pair of wires which ohm out fine.
Everything seems to point back to the SG. It's just not picking up a signal. I hate to say it but it sure is looking like the rotor magnet is the culprit.

There are new spark plugs in the bike.
Both coils are unlikely to go simultaneously (neither is firing)
Both SCR circuits in the ignitor are unlikely to fail at the same time, but I swapped the ignitor to be sure, and no change.
The wiring between the SG and ignitor is fine
The SG itself ohms out fine as did the original that was in the bike
I've swapped the SG/stator assembly and no change
This is frustrating!
 
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