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Message: [QUOTE="nitropimp, post: 844998, member: 49009"] Just curious, what are the rev limits on the big cc single cyl engines? I am trying to do some calculations for engine RPM using mph/gear ratio/and wheel diameter. My result is 3,527 rpm as I cross the finish line, 300' drags, in 5th gear. The WR has 5th gear trans ratio of 0.833. My best mph has been 63. The final drive ratio is 4.66(56/12) and I'm measuring to the top of the paddle for tire diameter, 28". Looks like I need to get up into the 60+T sprockets, I can get estimated ratios if I new about what rpm the engine stops making power (not kick the rod out the bottom rev). Eric did a mid-top over rev port job on this engine. But, I think there is more in it if I can ever get the gearing sorted out. Them BIG sprockets are expensive. [/QUOTE]