Rear shock linkage free play

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stevem

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Nov 20, 2021
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Hi all, There seems to be a fair bit of sideways freeplay in the rear linkage. Has anyone played with this and shimmed it to take some of the slack out?
 
yes you can eliminate a lot of the free play I changed the inserts to top hat bushings reducing the free play
 
Thanks mate , any idea of the minimum side clearance I would leave ( •4 - •5 mm) ?
 
stevem said:
Thanks mate , any idea of the minimum side clearance I would leave ( •4 - •5 mm) ?
Click to expand...

I assume you’re referring to the flat aluminum plates (2 items # 9 in parts list), one on each side of the linkage(item #10 and swingarm eyelet/lug). They are held parallel to each other by the bushings(2 items # 5) they tighten against, held by their bolt/nut at each end. If this is your point of side-play then you can buy shims to fit, but you’ll need to find the outside diameter of the bushings so any shim inside diameter will fit around the outside diameter of the bushings. The play should be about 1.0-2.0mm total.

1701227957774.jpeg
 
Last edited:
Sorry I have a video but can’t load it at the moment but on the photo where the triangle meets the frame and pretty much all the points it connects.
 
SBK-SP said:
I assume you’re referring to the flat aluminum plates (2 items # 9 in parts list), one on each side of the linkage(item #10 and swingarm eyelet/lug). They are held parallel to each other by the bushings(2 items # 5) they tighten against, held by their bolt/nut at each end. If this is your point of side-play then you can buy shims to fit, but you’ll need to find the outside diameter of the bushings so any shim inside diameter will fit around the outside diameter of the bushings. The play should be about 1.0-2.0mm total.

View attachment 52287
Click to expand...

* steel plates
 
bp_SFV4 said:
Interesting thread. To whom is this freeplay total value attributed to; is this something in the workshop manual?
Click to expand...

No, the workshop manual doesn’t specify a clearance as such. I’ve had mine apart while swapping to titanium fasteners and noticed the side play. The actual value doesn’t seem to matter as the side plates, when all the components are attached and torqued, don’t allow any angular motion other than parallel to the plates. Meaning that if you pry perpendicular against either end of the plates, the side plates assembly moves side-to-side as if a solid structure. As long as there is enough clearance for pivot rotation without rubbing against the swingarm or pivot knuckle it looks fine. The internal spacer(s) set the overall side play clearance.

Oh, yes the oem side plates are steel.
 
stevem said:
Sorry I have a video but can’t load it at the moment but on the photo where the triangle meets the frame and pretty much all the points it connects.
Click to expand...

When you say triangle are you talking about item 10?
 
Seriously though, the system will flex a small amount and if you shim it to take that play out, you'll run into binding issues. This is a non-issue. I wouldn't mess around with it.
 
I do track riding and used to have a 2011 s1000 bmw. I shined the swing arm end float on it and made a big difference on the change of direction. Sort of the difference between riding a superbike or a TZ gp bike. A lot more direct.
 
stevem said:
I do track riding and used to have a 2011 s1000 bmw. I shined the swing arm end float on it and made a big difference on the change of direction. Sort of the difference between riding a superbike or a TZ gp bike. A lot more direct.
Click to expand...

I’d go with welding that sucker then 😜
 
stevem said:
I do track riding and used to have a 2011 s1000 bmw. I shined the swing arm end float on it and made a big difference on the change of direction. Sort of the difference between riding a superbike or a TZ gp bike. A lot more direct.
Click to expand...

Shimming the shock linkage wouldn’t do much to the swingarm lateral “end float.” That’s determined by the tolerance in the swingarm pivot at the engine case/chassis and swingarm itself.
 
For sure , Was more thinking back at what difference that made and was wondering if there was anything to be gained here also. These things are mass produced and a couple of things have been out on it so it would be interesting to see the blueprints of the designer.
 

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