On the left side of the cylinder you can find a round metal-cover, which is fixed with two screws. You can see some linkages get in there. Get the two screws and the cover off. Now you see a small black nearly round plastic part, which is fixed by a screw. The linkages are holded by this plastic part.
Pull in the linkage screws and hang it off, so you have more space to work. Now you release the screw and the plastic part. Under the plastic part you see a metall nose. This metall is one side of the valve. You can rotate that nose for 180°.
This is a good starting for finetuning. Now you install everything and have a test ride. With the linkages you can tune the valve exactly.
Original size 57 KByte
Original size 879 KByte
A few more words: You can see the valve when you disassemble the exhaust manyfolder. The corner of the valve should appear about 3mm from the upper side of the cylinder when it's in neutral position (see picture).
You can reach the valve's neutral position when you turn on ignition and wait for the valve turning through and back again. After that the valve persists in neutral position. See also the pictures!
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