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Message: [QUOTE="EricGorr, post: 246179, member: 19611"] You may find that the powervalve (center) is carbon blocked and won't open fully. So cleaning the KIPS system is most important. For the porting, use a die grinder and an oval shaped burr to raise the exhaust port to 38mm from the top of the cylinder. Be carefull to polish the port edges and especially deburr the junction between the exhaust port's timing edge (top) and the center valve cavity. Also check the edges of the moving wedge valve for burrs. Theres a good picture in my book. When the edges get burrs, the valve won't open correctly. Good luck [/QUOTE]