Yamaha woodruff key Service Bulletin, finally!
Posted March 28, 2003 - 02:50 AM
I hope you have better luck with #418. I have #413, of course, it's still clean since it failed in the parking lot. The rotor nut was checked, the carb jetted richer before starting it. Then they even lapped it before it was ridden all to no avail, the key sheared with less than a mile on it. Yamaha is replacing the crank and rotor, the crank is in, the rotor well, 67 on back order, 38 in transit who knows when we'll see one, glad we didn't sell the KTM.
Posted March 28, 2003 - 05:11 AM
I have in my grubby little hands a Yamaha TSB numbered m2003-005 titled "Owner's /Service Manual correction - revision of rotor nut tightening torque" dated 3/7/2003.
I you have an e-mail I would be glad to attach a scanned copy of the first page.
Posted March 28, 2003 - 05:19 AM
Posted March 28, 2003 - 06:52 AM
edit: would love to see it just the same. Email me at email@example.com
Posted March 28, 2003 - 12:53 PM
Posted March 28, 2003 - 02:33 PM
Chaindrive has it pretty close really, if the taper is not self seizing, its not machined right or there is a material issue. Personally, I've never seen a proper taper not seize, it just doesn't make sense.
But what he said about the height of the key interested me. If true, the key could prevent the taper from ever closing... that would explain why loctite would help this problem. Not a real fix, but enough to help keep the flywheel from vibrating itself loose, killing the key.
Anyways, you don't want it any shorter than absolutely necessary though. While it is to prevent shear, it's not to carry the load. This is obvious to those of you shearing keys.. if it could handle the load alone, it would not have sheared.
Thus, you can try this... mount the flywheel with no key, no loctite, nothing... torque it to spec as if you were doing it for real. Take a sharpie and mark the nut and shaft with as clear a line or mark as you can... then repeat using the key in this time, and see if the nut bottoms to the same spot.
If the nut is not the same both times, chaindrive may have figured it out.
hope that helps y'all
Posted March 28, 2003 - 02:50 PM
Posted March 28, 2003 - 02:54 PM
Posted March 28, 2003 - 04:45 PM
In the meanwhile I've taken my bike to a very reputable shop that specializes in machine work and off-road racing vehicles (bikes, quads, sleds, etc) to have it opened up and looked at. In the event that the taper is a lousy fit, they are going to have a go at determining just why that's so, fix the problem, and give it back to me. Yup, i'm paying for this out of my own pocket, but at least i'll get an honest answer.
Bike may or may not be done tomorrow, so not sure when i'll have anything to report, but I'll start a new thread either way. If there is a problem, hopefully i'll be able to give a bit more insight into it, and on the chance that my bike comes back free of defect, perhaps it will allow some WR450 owners to breath a little easier when they're out on the trail.
Posted March 28, 2003 - 06:19 PM
I am going to work with the TT people and they said they may be able to post it for me. I sounds like this is not the TSB we want anyway; it is actually m2003-007 that we need to see. I was told by Yamaha CS that this TSB was globally faxed to ALL dealers yesterday and they should have it. I called mine and he said he did but ABSOLUTELY refused to fax it to me stating us internet hotheads would start trouble if they didn't keep these things to themselves. I told him trouble is already started!!!!
Posted March 28, 2003 - 07:30 PM
Posted March 28, 2003 - 10:18 PM
us internet hotheads would start trouble if they didn't keep these things to themselves.
I think we wish they actually had kept the trouble to themselves and away from everyone's expensive new bikes. As it turns out (so far), we were ahead of them yet again. Tell that guy I said he was a pompous ass and an idiot. We are trying to fix THEIR trouble, which is more than he can claim.
If a dealer is intentionally "keeping known problems and/or their solutions to himself", that constitutes fraud in my book. He should not be trusted or franchised to sell a tricycle.
You don't actually intend to ever spend a dime at his place again, do you? Right this minute some poor sucker is about to unload 15 to 20% of his annual take-home pay into that jerk's business for his dream machine... Does he sell used cars on the side? Or hold a political office? If not, he missed his calling.
Did you explain to him that first and foremost you are his CUSTOMER, not some "internet hothead" and he owes you the truth? He wants to see internet hothead, pm me his email! His attitude is worse than the problem.
Posted March 29, 2003 - 07:03 AM
I was kind of paraphrasing/adlibbing on the "internet hothead" thing in my attempt to be humorous. My dealer did give me verbal information about the TSB. The issues is in FAXing over TSBs. Extreme no no in Yamaha/Dealer policy and would not do it.
Posted March 29, 2003 - 12:39 PM
Posted April 08, 2003 - 07:11 AM
Posted April 08, 2003 - 07:33 AM
I would also ask your dealer to order the parts and then set up a time to bring it in.That way if the parts don't make it your not out riding on the weekend.