"Updated Parts" Update
Posted March 02, 2003 - 09:00 PM
Dealer repaired as per instructions from a Yamaha representative who was there. Dealer states Yamaha feels it is being caused by jetting that is too lean, causing a backfire during e-start that shears the key. They said they rejetted the carb and installed a stronger woodruff key. The part number for the key on my receipt is 90280-03001-00. I'm curious about whether this is in fact a new part number compared to the old key. My receipt also shows they replaced the spark plug, part number CR8E, an NGK plug.
I don't know what they jetted my carb to but now it runs like crap on the low end. It ran great opened up on the dunes but it would not idle and wanted to die whenever I was coming to a stop. Furthermore, I could only start it with the cold choke even after extended periods of wide-open riding. (It was about 50-60 degrees up there, but I wouldn't think that is cold enough to require the cold choke after long riding).
On the other hand, I used the heck out of my e-start, way more than I did before the initial key break, and I've had no problems.
So, now I need to figure out my jetting to get that bad boy running like it was meant to.
Posted March 03, 2003 - 04:17 AM
When I lapped the crankshaft I replaced my original key with a new key that was the PN shown in the manual. I will check to see if they are the same PN's.
UPDATE My dealer says the 90280 030001 00 PN is the same PN for the WR and YZ 450. So I can't understand how it would be a more robust Woodroff key unless a batch of their keys were under specification.
Posted March 03, 2003 - 07:02 AM
Dealer states Yamaha feels it is being caused by jetting that is too lean, causing a backfire during e-start that shears the key.
Hmmmm. I thought it was the e-start too, but there are at least two posts here that I've read where the key sheared while the bike was being ridden.
Maybe in those cases the key was already sheared but the rotor didn't go far enough out of time to prevent it from starting and running.
Posted March 03, 2003 - 08:15 AM
Posted March 03, 2003 - 08:24 AM
Posted March 03, 2003 - 10:02 AM
So I was puzzled to read this post where the Yamaha rep said it was a torque and jetting issue. I don't own a WR, but if I did I don't think that would do it for me...
Posted March 03, 2003 - 10:10 AM
I'll be taking the carb off soon to rejet and I'll post here to let everybody know what Yamaha had them put in. It should say on the jet, right?
BTW, anybody know what the part number for the GYT-R exhaust insert is? I'll do a search of the posts...
Posted March 03, 2003 - 10:16 AM
I am also suprised they said it was a torque and jetting issue.I brought my bike in when the key sheared at 120 miles.The dealer called Yamaha and they told him to lap them together.That was a hundred and some odd miles ago.I will be checking the torque tonight when i get home.
I have been using only the e-start when i'm riding with my buddies trying to get it to break.(After its warm)I am getting more and more confident that the bike is fixed.
I wasn't real happy pushing the dang bike for a couple miles till i got towed by a zuk .I love this bike and hope it gets worked out so this is a distant memory for everybody.
Posted March 03, 2003 - 11:51 AM
A previous post said that Yamaha replaced the woodruff key with a stronger one, but when I looked up the key PN it was the same one in the wr450 manual and was also used on the YZ 450 and Wr426. Maybe the keys they used were a bad batch and contributed to this problem.
Posted March 03, 2003 - 01:43 PM
It should say on the jet, right?
Yep, the size (or PN in the case of the needle which I doubt they changed) is stamped on the part, small type but visible to the naked eye (with good lighting).
Posted March 04, 2003 - 05:43 PM
Posted March 04, 2003 - 06:04 PM
Posted March 06, 2003 - 03:50 PM
On the positive side, it took only a week at the shop including parts shipping and it was a no-questions-asked repair. If the problem is really fixed, then I'll consider this a totally acceptable solution to a minor manufacturing glitch. We'll see...
Posted March 06, 2003 - 03:57 PM
Posted March 07, 2003 - 05:06 AM
Posted March 07, 2003 - 05:20 AM
Posted March 07, 2003 - 10:25 AM