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RK Tek Has developed an 827 (REALLY an 830cc) kit for the 2001-2007 800 Twin Engine. While we were not planning on big performance improvements in this little over-bore... we were soon proved WRONG! In side by side (stock 800 pipe) bench-mark testing against our RKT Mod 800 Engine Kit .. the 827 would pull 5 lengths on the hills and flats over our modified 800. This came as a HUGE surprise to us but the results do not lie. We were very pleased to say the least!!