I need some help with a good reliable electrical setup. I'm running an ngkb6hs plug and Ngk 7mm wire but I keep having a problem burning up mag coils. I store the bike inside so i know it's not from water plus I have it sealed up. This is my 4th mag coil I've burned up in under 6 months. It starts as intermittent spark and than it goes wide open, every single coil does the same thing after about 200 miles. My motor is a pk 80 with a speed carb jetted with delrotto 65 main. Spark plugs are a nice chocolate color. I do experience problems at top speed where the motor will just shut off until I get to a slower speed and than take off again. I'm really getting tired of replacing coils every month so any help is much appreciated. Also cdo checks out as it should. My set up is mounted on a 29er and I can hit speeds around 47 mph flat ground on a good day which makes me think I'm putting too much load on these coils. Anyway any advice helps