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00 kx 250 scratches on intake side of piston lines on the intake bridge of cylinder
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[QUOTE="bigred455, post: 798525, member: 19827"] 225 is stock on the 00 kx250 believe it or not,The problem is not with the chamfering of the port's .I use rubber bullets(cratex) to chamfer my port's CMF. It was a pretty simple answer what was causing the vertical scratches. I am always looking over the easy solutions. I have found out that if I premix 32:1 the scratches are not present starting with a new piston. I have a 03 I was using the Klotz R-50 at 40:1 and no scratches,but if you look very, very close, they were very vague but I was happy. I ran the mx2t at 32:1 and the piston was even better beautiful no scratches whatsoever,but I thought the crank was a little dry. I ran the amsoil at 50:1 and the intake side of the piston looked horrible,the crank was coated excellent and I do mean excellent,but the more I cut the oil ratio the worse it gets.Maxima 927 at 36:1 the piston looked great,also. I never did mention this,but in the past when using yamalube 2-r I never had this problem mixing 32:1.I have used other oils also at 40:1 with slight scratching THE PROBLEM IS OIL RELATED AND THE KX PORT LAYOUT ,NOT QUALITY,but quanity of oil!!!!! Not all KX 250 owners are going to see these scratches,It depends on how you ride. I have bashed people on here with their 20:1 Ratio's :bang:exaggerated, they are not far off!!!!!! That brings me to my next statement,how the heck can a oil company recommend A 50:1 ratio not knowing what size motor,how it is being used(rpms being usedand style of riding).I will say this for my riding conditions 32:1 is the ticket. I am thinking about trying the amsoil again at 32:1 I was really impressed with the crank condition,but their recommendation really pisses me off. WOW THIS IS A OLD THREAD! [/QUOTE]
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00 kx 250 scratches on intake side of piston lines on the intake bridge of cylinder
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