Weak Spark, help

[IrvSLedman]

Hey, i got my 83 big red out the other day and it wont run, it gets really weak spark. Does any one know what could cause this?weak coil? we changed them out but idk.
Thanks

Ryan

[jsimonh]

I had a weak spark on my Z 2 different times, and it was a weak coil both times. You can get a meter and check out all of your electrical parts.

[b182tm]

Did you replace the spark plug? I couldnt get mine to start, so I changed the aprk plug and it started right up. The old spark plug even got a spark, but it must have been too weak.