1983 gs550es no spark!

[hefe707]

I recently bought this 1983 gs550es that is in great shape (like new appearance). The controls all seem to work perfectly, it turns over gets fuel but there is no spark. At first I thought it could be the coils. I also have a 1985 gs550ef that runs great, so I took the coils off of the '83 and put them on the '85 and it started right up. I also switched the igniter and the '85 started right up again. I'm Stumped. New battery, plugs. I'm hoping someone can help point me in the right direction.
Thanks!

[Hoges]

Battery voltage okay on it?

[chef1366]

Did you try and swap the signal generator?
Two out of three ain't bad.

[hefe707]

Sorry for the delay, I switched the signal generator and no luck, I broke down and had a mechanic look at it (electrical is not my thing) and it ended up being the ignition switch. Swapped them out and it fired right up! Bike runs great. Cleaned the carbs and adjusted valves, new fork seals and tires and it's like a brand new bike. Thank for the input guys!