NPS Micro Sprint Engine Kits  Complete Race Engine kits for micro sprint car racing.  Stage 1, 2, 3, Outlaw, Multi and POWRi.  Kits include complete NPS race ready engine built to class specs.  Available for Suzuki GSXR 600, Honda CBR 600, Kawasaki ZX636 and Yamaha R6.          NPS Micro Sprint Cylinder Heads Complete Cylinder Head services for micro sprint car racing.  Stage 1, 2, 3, Outlaw, Multi and POWRi.  Services include Serdi valve job, surface milling, test & set valve spring pressures, pro assemble flow testing and porting per class specs.  Available for Suzuki GSXR 600, Honda CBR 600, Kawasaki ZX636, Yamaha R6, etc.     NPS Micro Sprint Engine Mods  Send in your micro sprint engine and have us transform it into a NPS HP & Torque Monster.  Stage 1, 2, 3, Outlaw, Multi and POWRi.  Mods include a complete NPS race engine build along with our renowned cylinder head services.  Available for Suzuki GSXR 600, Honda CBR 600, Kawasaki ZX636 and Yamaha R6.  Call us today to discuss your race engine options.       Motorcycle Race Engines and Competition Products. NPS Velocity Cylinder Heads The best combination of port shape and Serdi valve seat profiling to extract the full potential from your motorcycle’s cylinder head.  Intake port machining, epoxy inserts are added with final reshaping and serdi radius valve job for the best combination of port flow velocity and airflow CFM.   Available for Suzuki GSXR 600, 750, 1000 Honda CBR 600, 1000 Kawasaki ZX636, ZX10 and Yamaha R6.       NPS Power-UP Head Packages Complete top end packages including our Velocity head service, NPS designed camshafts, high compression head gasket, adjustable cam sprockets and assembly instructions.   Available for Suzuki GSXR 600, 1000 Hayabusa, Honda CBR 1000 Kawasaki ZX636, ZX10, and Yamaha R6.       NPS Motorcycle Roadrace Engine Mods  Send in your motorcycle engine and have us perform our renowned Roadrace engine building services for the best performance and reliability in the industry.  Will’s roadrace engines are at the top level of competition and have helped countless racers achieve success on the regional and national racing levels since the late nineties.  Mods include complete NPS race engine build along with our renowned cylinder head services.  Available for 600cc and 1000cc sportbikes.  Call us today to discuss your race engine options.       Performance Parts Dyno Tuning 4 Stroke Single Custom Heads