I have a 150cc redcat, I have no spark and don't know how to check coil, I've checked the wire harness, I found a loose connection but it didn't help, not real sure what to do now,,, can anyone help

 

Check out this link for another "no spark" thread. In this thread is a link that eventually gets to an article on testing the Kill Switch wiring. This is where you need to start:

http://forums.atvconnection.com/chin...get-spark.html

But, the link uses a different CDI as an example. So when they show the kill switch wire use this pic to find it instead of theirs:



Verify that the kill switches are/aren't the problem and we can proceed from there.