M Mike L New member Jun 8, 2010 #1 The sparkplug fouls after about 2 hours of riding on my sons yamaha wolverine 350, one of his friends removed something from the muffler to make it louder, would this cause the problem he is having?
The sparkplug fouls after about 2 hours of riding on my sons yamaha wolverine 350, one of his friends removed something from the muffler to make it louder, would this cause the problem he is having?
