dirt bike dave said:The timing will absolutely slip out without a woodruff key.
This could be dangerous out on the track or trail. You could get stranded or hurt.
FWIW, I had a woodruff key shear just starting a trail ride (the bike was a '84 KDX200). We had driven over 2 hours to get to the riding area and did not want to pack up and go home.
We found a washer in my buddy's tool kit and snipped pieces off with some tin snips. Used the washer peices as the woodruff key and got in a long day of trail riding.
IndyMX said:What size do you need? I had to buy some from a fastener company due to lack of availability of parts for a 1982 KTM engine.
So, I have 24 keys in my box that I can't use.
They are 4mm thick by 13 mm long by 5 mm tall.
If you or anyone else needs this size, I'd be happy to drop one in the mail to you.
Just email (not PM) me with your particulars.
Exactly what they told us in trade school, and as the tutor was into old and very old bikes he also told us about the valve paste and even brasso (for polishing brass candlesticks etc) as a finer finisher.RM_guy said:Guys, I hate to break it to you but the key is NOT there to prevent rotation. It is only there to insure proper alignment. The taper in the shaft along with the proper torque is what keeps the flywheel from spinning.
It is very important that the taper (on both the flywheel and the shaft) is perfectly clean before assembly. Any oil or contamination will mess up the joint. You shouldn’t even touch it after it’s been cleaned. Then the nut has to be torqued to the correct spec.
If the key does shear and the flywheel has been spinning for very long it can damage the tapers and you may need to replace both the flywheel and the crankshaft. They can be repaired if it isn’t too bad but if not done properly it will just spin again.
So, yes you can run it without the key but it has to be aligned properly and, more importantly, if it has already spun the tapers must be inspected to insure they are not damaged.
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