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Honda MX & Off-Road Dirt Bikes
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[QUOTE="dirt bike dave, post: 1432469, member: 18302"] On your CR, you can check if the power valve is operating quite easily. There is an inspection plug/cover on the left side of the cylinder. I think it takes a 17mm wrench to remove the cover. Underneath that is the end of the shaft that operates the power valve. Remove the cover and start the bike. Rev it up. If the shaft rotates 90 degrees with rpm, the valve is operating. If the shaft is not rotating, it could be a problem with the linkage (which is on the other side of the cylinder). The parts on the linkage with the little allen head bolts can be tightened by removing the little cover on the right side. I think it has 3 or so 8mm head bolts. This can be done without removing the cylinder. On my bike I would clean the power valve when I changed rings, so the cylinder was off anyways. FWIW, the '92 - '01 CR250 power valve is a good design and it tends to stay cleaner than most bikes (in my experience). If you do remove the cylinder for whatever reason, you have to be careful when putting the cylinder back on. There is a 'fork' in the cases that moves the power valve linkage, and a 'pin' at the bottom of the cylinder for the power valve system. The pin has to go into the fork. If it does not, the valve will not work and you will have to pull the cylinder off to align them. It's easy to do right, as long as you make sure the 'fork' is in the correct position when you re-install the cylinder. Since your bike was previously running good, the pin must be lined up properly in the fork. I don't think it can ever jump out if the cylinder was put on correctly. [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
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