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Love it, you probably have one of the handful in existence of RS250 engine swaps and it must be crazy. CPI is working on a new powervalved cheetah design with a 73mm bore. You could possibly end up with the engine that The Two-Stroke Shop could only dream of delivering and your new power delivery with a PV system. 521 Super Serval 535 Cheetah with PV's You might end up liking the Cheetah better on road because you'll have so much more up top. Only issue you might end up being a guinea pig until builders have the new engine worked out.