Back in the garage today, disassembling the Bandit, and this was my surprise of the day.
Suzuki calls this item a "Signal Generator Rotor" but the everyone in the Do-it-yourself fuel injection world calls it a "Trigger Wheel"
A while back I purchased a used 1993 Bandit 400 trigger wheel off of Ebay, it matched the pictures and drawings that I saw in the Bandit 400 Service manual. But today, when I took the left engine side cover off I found that my Bandit has a different trigger wheel.
This isn't the first time I've had confusion related to a product of the Denso Corperation. Those guys produce some strangely configured stuff.
These two trigger wheels both fit onto my Bandit identically (after I removed the original trigger wheel I test-installed the Ebay purchased trigger wheel and it fits). The Top-Dead-Center reference mark on both of them is lined up in the exact same place with regard to the Woodruff Key slot that keeps them properly located on the crankshaft.
It's pretty obvious that these trigger wheels are part of two different versions of the Denso ignition system that was installed on the Bandit 400 which makes me wonder if my engine might not be a 1993. I don't know much about the history of this bike, I guess it's possible that the bike's original engine was replaced at some point.
Can anybody provide any information about this situation? (The identification sticker on my Bandit's frame has a manufactured date of 8/92 stamped on it)
Anyway... here are the two trigger wheels.
First up, the trigger wheel I just removed from my BanditAnd here's the trigger wheel I bought off of Ebay.(I even weighed them both and they are within an ounce of each other.)