This is an example of optimal GY6 ignition system performance.
Unfortunately, it's common for manufacturers cut corners on the design of their harnesses.
Here is what you're seeing in the picture:
1. Buggy Depot USA-made Wiring Harness
I designed this harness to make the most of the GY6 ignition system. Most importantly, the AC and DC grounding paths are separated. Most other harness designs I've seen cut corners and mix grounding paths together. If you don't understand what this means, don't try separating your grounds.
2. Standard Buggy Depot AC CDI
3. Standard Buggy Depot Ignition Coil
4. Standard spark plug
It comes down to good tested components. If you have good components, but still have weak spark, the problem is most like either: worn harness, bad installation, or switch issues.
Post in this thread for issues relating to weak spark.
Don't post unless you've already visually checked and verified that you DO have spark, but found that it is weak.
If you DON'T have spark, go here.
Travis • Buggy Depot • Enthusiast owned and operated since 2005