Ignitor boxes for a twin

[John Park]

Is there a reason why you couldn't use a 4 cyl ignitor on a 450 twin? Two pickups and two coils either way, just fewer plugs and ht leads.

Is there a better choice between Nippon Denso and Kokusan Denki? Are all the different part numbers mostly a matter of connectors and mounts or is there an actual internal difference to be aware of?

The PO put a new [used] ignitor box in my bike just before I got it, but I'd like to have a spare around.

[tom203]

Knowing Suzuki's penchant for making subtle variations, i'd get a spare ignitor with same part number as you got now- put on bike and test it to know it's good and relax!
go ebaying and/or post in parts wanted forum

[Wallowgreen]

Is there a reason why you couldn't use a 4 cyl ignitor on a 450 twin? Two pickups and two coils either way, just fewer plugs and ht leads.

I have used a GS550/4 ignitor when diagnosing a problem on a GS250 twin so it certainly can be done. Was a long time ago so unsure now what I was able to verify before actually attempting it but I do remember the conclusion I came to was the internals of many (but not all) ignitors appear to function the same. The difference between what I had was simply the connection to the harness that resulted in a different part number. I didn't want to "modify" either ignitor or harness so made a conversion cable. Bit of a nightmare but it did work like you'd never know the difference.

[John Park]

I'd think that the four cylinder coils would draw more load rather than less on the ignitor box; I'd be more hesitant to go the other way and use a twin module on a four.

I've always been careful to give the spark a reasonable path to ground rather than leave the ht leads swinging in the wind. On some Suzuki RM bikes you could fry a module pretty fast that way, but the later ones were more robust. It's easier on the coils, too.