Size is everything
Posted March 04, 2003 - 08:07 AM
Posted March 04, 2003 - 10:53 AM
And it only a little 125 2 stroke?
makes you wonder.
Posted March 04, 2003 - 11:18 AM
So why is the key on the 125 so big?
Posted March 04, 2003 - 11:27 AM
Does everybody remember the dates we were told that we would get these great bikes with tiny woodruff keys? Now considering the special circumstances I have outline, I think we have found our reason for the delay in getting the WR's to us!
So the morale of the story is design big woodruff keys so that you are not running late getting the product to the customer!
Posted March 04, 2003 - 12:03 PM
If some forces are applied such as backfire, locking up the bike, or whatever, the forces are twofold, first spinning the rotor (opps the key broke) or the rotor moves slightly away from the shaft and no longer has sufficient purchase,and then the rotor slips (oops there goes a key.) I contend, but have been afraid to say it, that the key does have some responsibilities other than timing alignment. Those responsibilities are to shoulder a slight movement of the rotor that was torqued correctly but still might move a few thousands of and inch and then provide enough support that the rotor holds in place. This key is used on the 426's and the YZ and Wr 450's. I wonder which rotor weighs the most (450?). I don't think the key is up to the task. So, how about a longer one, that will give it greater shear strength. Others have said it is the job of the key to shear intentionally to save the engine from some disaster. Someone explain why it needs to do this.