Exhaust contact on ARO frame at 1/2 travel of TSS

[cbc76am]

So my 450 SX-F and ARO120 have the same issues I had with my old 525 and SX120. The installation video shows cutting the airbox for clearance of the timbersled frame when using TSS. That's fine and all, but at the same time that the airbox drain would make contact, the side panel on the left and the exhaust on the right contact the frame.

It's only about half of the travel of the TSS that this occurs. I could thread out the bottom of the strut to raise the height and get some more clearance, also then having to drop my forks to maintain the track rocker on the ground to be level... but it's not going to get me full travel without my silencer getting smashed through the season. Getting only half of the intended travel of the TSS is crap, I can't believe this is still an issue with this kits. After being excited to build this new bike, i'm frustrated already in having to ghetto rig the rear of the bike to get at best 2/3 of the travel of the pivot.

Anyone have ideas or solutions in mind for this?

 

[teal_210]

How much travel is there on the shaft of the TSS before it hits?
The TSS was never intended to be full travel, you're supposed to set it to only travel 1 3/8" I believe.

 

[cbc76am]

How would you set it? There is no bottom out stop on the shock that would keep it from going past 1 3/8. So you'd have to over compensate the pressure in the shock and hope you don't take a big enough hit to still crumple the exhaust... also then you would have no sag under normal weight. No offense, I appreciate you responding but that doesn't' work for my engineering brain without some kind of mechanism to control the overall travel.

 

[teal_210]

You set it by the air pressure. It isn't supposed to sag when you sit on it. I'm not saying it's right or wrong, just that's how it's supposed to be set up per Timbersled.

 

[cbc76am]

understood. I set the pressure to 250, what the manual says for my weight range. After a few years of this I typically found that about 5-10mm of rider weight based sag produces the best feel. As you pointed out there is an intended range, and it's not the full shaft... there is supposed to be 1.5 inches of travel left on the shaft. That said, it's pretty close... the instructions are to add pressure until that is what is seen on a maximum travel event.... which is really hard to create - at least without the risk of harming the exhaust can. Thanks for the feedback, you lead me to read more and find the travel limit measurement, which releases some of my frustration to know i'm close.

 

[Sheetmetalfab]

So my 450 SX-F and ARO120 have the same issues I had with my old 525 and SX120. The installation video shows cutting the airbox for clearance of the timbersled frame when using TSS. That's fine and all, but at the same time that the airbox drain would make contact, the side panel on the left and the exhaust on the right contact the frame.

It's only about half of the travel of the TSS that this occurs. I could thread out the bottom of the strut to raise the height and get some more clearance, also then having to drop my forks to maintain the track rocker on the ground to be level... but it's not going to get me full travel without my silencer getting smashed through the season. Getting only half of the intended travel of the TSS is crap, I can't believe this is still an issue with this kits. After being excited to build this new bike, i'm frustrated already in having to ghetto rig the rear of the bike to get at best 2/3 of the travel of the pivot.

Anyone have ideas or solutions in mind for this?

Mock it up with the stock exhaust?

 

[cbc76am]

this is a factory edition, so that is the stock exhaust... I think the Yosh would clear an extra 1/2 or so but for now I'll just raise the threads on the strut and see if I can land a 1.5 inches left of shaft. right not i'm 1.4 inch shy when the can hits.

 

[Sheetmetalfab]

this is a factory edition, so that is the stock exhaust... I think the Yosh would clear an extra 1/2 or so but for now I'll just raise the threads on the strut and see if I can land a 1.5 inches left of shaft. right not i'm 1.4 inch shy when the can hits.

Gotcha.

Cut the side frame or dent in your silencer. (Denting probably the best option) this will just compress the packing in that area as the airflow is through the center. (No warranty on that silencer anyways.)
Really the only options you have.

Handling will only suffer from jacking the back end higher.

 

[konrad731]

Remove the strut and collapse it. You will see it only has about 1 3/8" of travel.

 

[cbc76am]

indeed, this is good info, I was comparing it to my 2015 SX with the full travel shock on the chassis and not seeing the intended stroke of the TSS. I'm still making slight contact just before bottom before tuning, but ride quality should still be spot on. I'll grab a cheap round can and toss the ti one on the shelf for the winter if needed.

 

[PalousePoo]

Check the overall dimension of your tss shock, center to center, and compare to the spec for your bike. Mine was too short, so I extended it.