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Ducati Monster Forum
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(Moderator:
Speeddog
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Dual swingarm, rear axle gap
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Topic: Dual swingarm, rear axle gap (Read 3529 times)
dusty
New Member
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Posts: 34
Re: Dual swingarm, rear axle gap
«
Reply #15 on:
June 20, 2018, 09:40:30 AM »
I'm far from a frame specialist, or.. well, any sort of precise engineer, so it's difficult for me to say whether or not it's straight. I went out to take another look in the light of day, and did notice some peculiar ripples along certain flats, but I can't tell if they're from the factory or not. I say that (again, not a mechanical engineer) only because the ripples seem too uniform to be warping from shock, and because the top/bottom flats have no visual or tactile deformation - plus, the ripples seem formed in a way that should make the gap narrower as opposed to wider. The swingarm itself seems asymmetrical from the factory to accommodate the bulkier sprocket drive on the one side, so I couldn't think of any way to do a string test. There are zero apparent cracks or breaks in the welds or in the sheet metal itself (stripped the old paint off when refinishing, I imagine any crack would have stuck out like a sore thumb)
No chew damage on the inside flats where the conical spacer goes, for sure.
Inside left. The marks toward the end is just excess grease I didn't wipe off.
Outside left
Inside right
Overhead left
Outside right
Overheard right
Interesting in a way I guess: While looking up the cost of a new used swingarm, I noticed the same ripples on a few swingarms from 695s. THE MYSTERY DEEPENS.
«
Last Edit: June 20, 2018, 09:44:30 AM by dusty
»
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Howie
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Posts: 16850
Re: Dual swingarm, rear axle gap
«
Reply #16 on:
June 20, 2018, 10:55:37 AM »
The ripples are normal. Engineer or not, you would need to compare it to a known good swing arm.
Just a thought, don't do this until others chime in. Tighten the axle nuts to the correct value, do not exceed the torque value. If the gap disappears, check the wheel alignment. Alignment is good, no problem.
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koko64
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Re: Dual swingarm, rear axle gap
«
Reply #17 on:
June 20, 2018, 12:52:46 PM »
If the caliper lines up ok with the disc centered and the gap is on the sprocket side, then it could be the wrong Cush Drive?
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2015 Scrambler 800
dusty
New Member
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Posts: 34
Re: Dual swingarm, rear axle gap
«
Reply #18 on:
June 20, 2018, 01:48:48 PM »
Quote from: howie on June 20, 2018, 10:55:37 AM
The ripples are normal. Engineer or not, you would need to compare it to a known good swing arm.
Just a thought, don't do this until others chime in. Tighten the axle nuts to the correct value, do not exceed the torque value. If the gap disappears, check the wheel alignment. Alignment is good, no problem.
This was my thought as well, but I wasn't sure if I was just feeding into my eagerness to get this bike on the road. These swingarms seem pretty solidly built, I can't imagine the kind of force needed to permanently spread them even that small amount.
Quote from: koko64 on June 20, 2018, 12:52:46 PM
If the caliper lines up ok with the disc centered and the gap is on the sprocket side, then it could be the wrong Cush Drive?
Caliper lines up, but the sprocket does also when the wheel is fully to the left. I'll check the part number on the cush drive later, but I think it's the original one
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Speeddog
West Valley Flatlander
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RIP Nicky
Re: Dual swingarm, rear axle gap
«
Reply #19 on:
June 20, 2018, 02:12:16 PM »
Part numbers on a component are seldom for the *finished* part, they're for the raw casting or forging.
Not super helpful to anyone other than the factory and their vendors.
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dusty
New Member
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Posts: 34
Re: Dual swingarm, rear axle gap
«
Reply #20 on:
June 21, 2018, 12:05:15 PM »
Fair enough! It'd be really useful if they
did
stamp it, though
Tightened up the rear axle to the greased 83 NM my manual specifies, all while sweating bullets. Undid the nuts afterwards and the swingarm sprung back out to the same gap, for what little that means. Front and rear sprockets are aligned according to my flat edge and string, and the notches for the chain adjuster are equal to whatever degree of accuracy those plates can provide. I'm a little nervous about it, but I'll have the frame and wheels checked for alignment at a proper shop when it goes for inspection.
Thanks guys, means a lot to get so many helpful responses.
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stopintime
Hero Member
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Posts: 8928
S2R 800 '07
Re: Dual swingarm, rear axle gap
«
Reply #21 on:
June 21, 2018, 12:28:09 PM »
https://www.profi-products.de/en/profi-cat-laser/motorcycle-chain-belt-alignment/3/chain-alignment-tool-se-cat?c=6
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237,000 km/sixteen years - loving it
koko64
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Posts: 15655
Re: Dual swingarm, rear axle gap
«
Reply #22 on:
July 02, 2018, 01:43:40 AM »
What was the outcome?
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2015 Scrambler 800
dusty
New Member
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Posts: 34
Re: Dual swingarm, rear axle gap
«
Reply #23 on:
July 08, 2018, 05:26:42 PM »
No idea really. Everything's tightened up and appears to be fine, but only time will tell - which is a terrifying prospect for such a big part of the bike
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Qomomoko
Full Member
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Posts: 219
Return of the Yoga
Re: Dual swingarm, rear axle gap
«
Reply #24 on:
January 08, 2019, 01:36:57 AM »
any update?
Hope its holding up well or even better you got a "professional" opinion look at it and give the thumbs up
preferably with pictures of video
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dusty
New Member
Offline
Posts: 34
Re: Dual swingarm, rear axle gap
«
Reply #25 on:
February 11, 2019, 11:23:34 AM »
Nothing worth mentioning (for better and worse?)! Winter came pretty early last year, so I didn't get a chance to get it out to a frame specialist - not that I'd even know where to find one in the northeast. It's tracking straight at least without any odd behavior, but if it's there I'm sure it'll be one of those things you don't really notice until your bike is slinging you off.
Next up on the list is finding a decent replacement for the split/cored/re-baffled stock cans.
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