Good to know about the 105 being the heat range. That is a new one to me. Knowing that, then maybe a BR9ES wood be a better choice for my wife on the trails. That way it would be just a tad hotter than what is in it now. Or..... Since we have not had any big problems with it and we never go into the woods without at least one extra plug for it, maybe I would be better to stay with the R6252K-105.
What are your thoughts guys, try a BR9ES or stick with the stock plug? If the 9 may cause piston failures, then I don't have any problems with a fouled plug once in a while by sticking with the 105.
Thaks for your thoughts.