Eventually the clearance becomes quite sizeable. The powervalve bore are worn away, making the collar even freer to moveĪround. The more the collar vibrates and rotates, the more it and
Kawasaki kmx 125 power valve free#
Is free to rotate, which it will do enthusiastically as age and vibration This part has aĬutaway segment that, on the right side, locates the two collars togetherĪnd prevents them from rotating. On the right side (same part number for all three). Uses the same removable top bearing collar on the left side as the two I believe that part of the reason for this is as follows: The left valve suffers from prematurely worn and stripped Its reputation for failing earlier and more frequently than the right-side To have a design weakness which probably contributes significantly to Noticed when overhauling my top end that the left side powervalve seems Suffer from the weakness of earlier versions. 1995 and later KDX200sĪnd 220s use a different powervalve arrangement that does not seem to Possibly some or all of the water-cooled KDX250s. The earlier air-cooled 200s ('86-'88) I'm not sure and It should be relevantįor all similar models that use the older style of KIPS powervalve. If you do so, you will need to grind the Power Valve a bit so it will not hit the new, oversized piston.Modification is based upon my 1991 Kawasaki KDX200. If you have a steel cylinder liner, and not a plated cylinder, you can bore the cylinder to a bigger oversize. On most Race bikes that means cleaning and readjusting them every seven (7) to twelve (12) hours of running.
Kawasaki kmx 125 power valve manual#
When you first disassemble them for cleaning a shop manual will be invaluable.Īlso remember that these things require regular maintenance to remove carbon. Power Valves have a lot of parts in them. this ensures the exhaust valve returns to closed when the Governor releases pressure on it. On Suzukis there's a spring to set preload on (one turn). With Kawasakis you must align the punch marks on the exhaust valve gears with grooves on the Valve Operating Rod. Now loosen the adjusting bolt on the linkage arm, then tighten it. Adjustment is done by putting a rod, of the right size, in both holes, locking the power valve closed. On Hondas and Yamahas there usually is a small hole in the cylinder and a hole or goove in the linkage arm. In general, the big thing to remember on power valves is that they are closed when the engine is off. Everyone has different linkages, different styles of Governor, and different ways of adjusting them. Each manufacturer has a different way of moving the power valve. The Power Valve does this with centrifugal weights (Governor) that over come spring pressure and move the Power Valve Linkage. The power valve should be closed at Low RPM and Open at High RPM. It does this by keeping more of the fuel mixture in the cylinder, and out of the exhaust pipe, at lower RPM. By making the port smaller, the power valve helps make the power band wider. Big ports mean big horsepower, but they also mean narrow power band. A power valve is just a piece of metal that moves down and covers part of exhaust port making it smaller. ¶ Most if not all the two stroke race bikes sold now-a-days have a power valve in the exhaust port.