The powervalve assembly for the WDK1200 is unique in many different ways. The valve body is machined out of billet aluminum, keeping the overall weight down. The shaft is a ground, hardened steel, that is turned on a cnc lathe to exact specs. The base is also machined from aluminum and has a very cool feature. A bronze, oil impregnated bushing is pressed into the base where the shaft goes through. This combination of shaft and bushing eliminates wear. No problems EVER!!!!! The base has two exhaust pressure holes instead of one, which is typical. This allows for much quicker valve response.
The top of the valve body has stops machine into in that contact the base. When the valve is full up, it is smooth with the top of the exhaust port.....perfect match. There are stops for the valve body machined into the cylinder, eliminating any chance of the valve ever hitting the piston. The valve to piston clearance is .008 which creates a great seal, and a perfect operating valve.