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Recently I installed a HMF optimizer, and HMF XL exhaust on my 07 Honda Rancher 420. I have been trying to fine tune it, but when the engine is cold (and temp outside was about 40) it started and died about 5 seconds later. During that time I noticed that the headlights flashed off and on. After the engine died the engine would not restart. It would turn over, but not start. I checked the spark and it had plenty of spark. The bike is about three years old and I have not changed the battery yet, so thats where I started. After new battery, same problem. I noticed that the spark plug was BLACK and WET (with fuel). I put a new plug in it and it started right up. Running fine. (still fine tuning HMF optimizer though).
SO, on to next problem.......I attempted to turn the headlights back on but they would not come on. I checked the fuses in the rear fuse panel. All are fine. Even swapped fuse to see, and still nothing. I looked at the bulb, and the elements look fine but I will be changing them hoping it caused an electrical spike that burned out the elements.
So....If yall have any recommendations on what to look at next please let me know.
 

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I'd say it's the bulb.
 

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Glad you got it fixed bro.
 
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