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Message: [QUOTE="griffbones, post: 1187966, member: 72285"] Most of the local guys are running 40:1 & 50:1 on the 100's and the 85's when using the Dominator oil. I am always confused by this because some people say to run the bike manufacturers specs, and others like Eric Gorr say to run what the oil manufacturer recommends for their product because different oils are different. I didn't have the equipment (bore gauge) to measure the cylinder, but I did check the ring gap. What made this thing loose the first bone stock top end? What the heck changed from the previous times we had the bike out? This was an ultra low hours engine (brand new 2007 KX100 engine). I changed nothing as far as set-up and I always do maintenance ie. air filters, tranny oil, fresh premix, a compression test after every couple of rides, and many of my son's rides are short, like only an hour or two tops. [/QUOTE]