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Message: [QUOTE="DCMan, post: 1401162, member: 23568"] I am still 2 stroke all the way & a green one at that! Most of the guys racing provincials up here in Ontario are on 2 strokes. In relation to the pollution, some one once raised the point that you need to compare pollution/power. Don't forget 450's have almost twice the displacement of the 250 2-strokes. At equal displacement the 4-strokes may put out a bit less at the tailpipe but it is even negligible unless they run a catalytic. When comparing different displacements the 2-T should put out less. (Use synthetic oil mixed at 50 or 100:1) [/QUOTE]