Troubleshooting no spark

[flightofphx]

I have a 200x I picked up recently. The PO told me it had not started in 20 years. I first checked for spark and it had spark, but it was weak. I cleaned up the ground and put in a new plug and had a better spark. After cleaning the carb and tank really well, it started. I ran it for a couple of minutes. Now, I cannot get it restarted. I have no spark. I subbed a different coil, which I was told came off a running bike. Still no spark. I am cleaning the switch, but it looks intact. What would be the next things to check?

[Scootertrash]

I subbed a different coil, which I was told came off a running bike. Still no spark.

Test the coil. It doesn't matter what the previous coil owner told you.

[Jim mac]

did you try a new plug? my last 185s had a good looking plug, no spark, swapped a used plug and fired right off!. jim

[shortline10]

First check all connections and as stated the spark plug.
CDI box , very common for them to go bad after sitting for a while .
They will work for a few minutes and then take a crap when power was put threw them .
Their are parts like capacitors in them that have a shelf life .