1. Carefully check your wire connections from the CDI to the coil.
2. Carefully inspect (this means remove the coil so you can handle it), the sparkplug wire for cracks, places were the electricity can arc away to ground.
3. Carefully inspect your plug: porcelain cracked? Could be bad inside, try another.
4. Switch that coil to another position, does the problem follow the coil?
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