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Garrcano
| | Posted on Friday, May 14, 2010 - 11:33 am: | 
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Take of the belt, rise the bike/rear wheel and check lateral play of the swingarm. Maybe it will give you an idea of the bearing's status. |
Ourdee
| | Posted on Friday, May 14, 2010 - 05:26 pm: |
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Lots of thoughts being thrown out there. oo oo oo I got one. Look at the rear engine mount. That ones free. |
Nvr2old
| | Posted on Friday, May 14, 2010 - 06:24 pm: |
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Is it the assortment of dogbones that restrict lateral movement of the engine relative to the frame? |
Riding_tall
| | Posted on Friday, May 14, 2010 - 06:33 pm: |
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Sorry to hear about your troubles. hoping it turns out to be something simple. Did the belt have any marks or wear that would show that it was rubbing ?
Ohhh the new strada looks so much better than the original and that on-the-fly suspension change sounds cool. If I find an extra 19k I'll have one.
Hate to say it but the duck is the water-cooled Uly many of us have though/dreamed about. That said .. haven't ridden one but the specs sure look good.
What ever you do, sure hope you keep the Uly. |
Hughlysses
| | Posted on Friday, May 14, 2010 - 06:33 pm: |
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Since the swingarm support is bolted rigidly to the back of the engine, that takes isolators and tie bars out of the equation. Either the wheel (and therefore the wheel sprocket), the swingarm, the idler pulley, or the transmission output shaft (and therefore the drive sprocket) has to be out of alignment. |
Ourdee
| | Posted on Friday, May 14, 2010 - 09:17 pm: |
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Check that support where it is bolted to the engine. |
Alchemy
| | Posted on Friday, May 14, 2010 - 09:30 pm: |
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The manual has a warning about the sequence of tightening the magic frame piece vs the axle etc. If I remember correctly. |
Dr_greg
| | Posted on Saturday, May 15, 2010 - 06:40 pm: |
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Thanks for all the tips, but remember:
This happened about a month ago completely spontaneously...no crashes, no recent work on the bike, nothing. Just came out of nowhere. I bought the bike w/9,000 miles and it just turned 30,000. Of course the belt could have been slowly edging its way over, and only recently started rubbing the case. Belt tracking is not something I've really been monitoring during maintenance.
Thanks to my "parts" bike 044, I've swapped every component in the drivetrain except engine and swingarm.
I guess I did recently mount tires, but I've removed the wheel sprocket many times; didn't do anything different this time (yes, I torque it properly). When I switched wheels, that included sprocket, and the problem persisted.
Running errands today (among them the ordering of swingarm bearings just in case) I couldn't really hear any whining. Of course it's been so blasted windy here in NM this spring that you can't hear anything...
I'd consider swapping swingarms w/044, but it went down at 72 mph and I have NO IDEA how it tumbled/landed (my mind was elsewhere). Good chance there are tweaks all through that bike.
If the wheel and countershaft axes were misaligned such that their intersection point was to the RIGHT of the bike (remember, parallel lines intersect at infinity), the belt would leave the wheel sprocket headed inwards toward the case. Maybe that's what's happening; the question is WHY?
IMHO the idler pulley should have little effect on belt tracking, since it is placed AFTER the drive pulley. BTW, if I rotate the rear wheel backwards, the belt moves to the OUTSIDE of the drive pulley. When I rotate the wheel forwards, it slowly edges back to the inside.
So if the swingarm (and engine) are not bent, it has to be bearings, right? Either wheel bearings (which it isn't) or swingarm bearings.
Here's something that occurred to me: if I needed a new swingarm (which I don't) I wonder if they are available?
FWIW I ordered fork seals and another drive belt recently and had them within a week. Parts guy at local H-D said "we'll have Buell parts for TEN years!" I didn't say anything...
Mrs. Greg and I saw the MTS1200 last night at the dealer. Nice! She hated the GS I testrode, but she's almost urging me to get the Ducati. If I did, I'd certainly keep the Uly. It has given me more enjoyment than any other bike, and I honestly do love it. Lord knows I'm familiar with it, and that knowledge is priceless.
--Doc |
Hughlysses
| | Posted on Saturday, May 15, 2010 - 08:14 pm: |
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Doc- Besides wheel bearings or swingarm bearings, it could be the transmission output shaft bearings, right? I believe the outer bearing (the one behind the drive sprocket) can be replaced without doing any drastic disassembly. |
Swampy
| | Posted on Saturday, May 15, 2010 - 08:50 pm: |
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If the countershaft bearing was bad the belt would probably trac to the outside. If the bearing was bad you could remove the belt and feel play in the countershaft. |
Tootal
| | Posted on Saturday, May 15, 2010 - 09:06 pm: |
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Well Doc, I got out the service manual and took a good look at my Uly and came to the same conclusion you did. If your bearings are all good it has to be the swing arm bushings or something related to the swingarm to transmission case assembly. If any of the links, (3), that align the engine were worn or bent it would only cause your wheels to be out of alignment so that narrows it back down to the swingarm bushings. The fact the belt changes direction when turned backwards tells me the rear sprocket is out of alignment top to bottom which could be caused by a bent swingarm or worn bushings allowing one side to drop down. I think your getting warm Doc. I hope you find something, that crap drives me crazy and I'm too close to being crazy without any help! |
Firstbatch
| | Posted on Sunday, May 23, 2010 - 11:04 am: |
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Doc saw your write up on the extended demo of the Duc 1200 MS over on ADV. What a hoot with the drop! Congrats on the proper Red one....Like to hear more about the Uly comparo. Right off the bat you thought the wind protection was less on the MS. Looks lke a sweet ride |
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