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Dirt Bike Mods & Maintenance
Kx 250 power valve
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[QUOTE="Ol'89r, post: 1194485, member: 17212"] The two on the sides that rotate are your transfer port valves. When you look in your exhaust port and physically open the powervalve, (the middle one), the two rotating valves on the side should also be in the open position. When the middle power valve is closed, the side valves will also be closed. Unless your cylinder was bead blasted when you rebuilt the top end, there should be small shiny wear marks on the cylinder where the side valves rub the cylinder in the closed position. If those rub marks are still in there, you can use them to determine exactly where the closed position of the side valve is. You can also look at the angle of the side valves and the port to align the valves. When you open the powervalve by hand to it's full open position, the side valves should be in the full open position. The angle cut on the open part of the side valve will align with the angle of the side of the transfer ports. If you look in the exhaust port you will be able to see this alignment. It's pretty obvious when you look in the port and open and close the powervalve by hand. If you are off by one notch either way, the side valve will either block the transfer port a little bit or open too far exposing the side of the port. If set correctly, it should line up with the edge of the port. Good luck. :cool: [/QUOTE]
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MX, SX & Off-Road Discussions
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Kx 250 power valve
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