I just recently changed out the bottom jug of the E50 motor, put everything back together and it started, test rode it, ran really good, it idled super smooth, no problems. Now when i start it, there is a high pitched squeal, kinda sounds like a bird chirping coming from the cylinder while its running and its backfiring, more like a popping sound kinda like popcorn from in between the cylinders it seems. There is also a very unique smell kinda like electrical but not electrical if that makes sense. Could it possibly be the timing, or maybe the piston rings that are scraping the inside of the cylinder? Whatever it is, its super creepy. Any info would be appreciated