- Nov 30, 2001
Hi guys. I've searched and can't come up with the info I was looking for. What are the differences in these fuels? I have a new kxf250 and have tried Ultimate 4 with decent results. Someone suggested I try MR2 and I am unfamiliar with the differences of the 2 fuels. What fuels have you all had luck with in the little thumpers? Thank you for the help.