That's very interesting. I have run several 821s and always had to click up after break-in. I bought a new one several weeks ago and left my clickers on 4 from the last one. I was thinking it would rev high but it didn't. Right outta the gate I'm at 7900-8000

 

I can’t say the new 821 is an improvement. I was thinking running 8300-8400. Mine was very inconsistent. I went back to a 571 today and my sled is working like I expect.

 

Dang

 

So did they say anything about making it longer?

 

 

I will report back on this. I JUST blew a GBoost belt on my last trip, and put on a very low milage and broken in stock 571 for the remainder of the trip. I bought an xs821 to try on the next trip. We’ll see how the new design works.

I do have a HRSS clutch kit that I set and forget. I don’t tune it for the days conditions, but it has always run right around 8100 RPM, so I have been happy.

What did they mention about break in? I have always taken it easy, varied throttle and let it get a couple of heat cycle before really going for it again. Maybe 50 miles total.

 

I have the HRSS as well. Love it. You go to 8100? I go to 7900, thinking of dropping a single magnet in hole 2 (the one closer to the pivot).

Break in was all about heat cycling...the ideal way is to slowly but surely ramp to WOT, then just as surely and slowly slow back down to idle, quickly do it two more times, then take it for a cool down. Of course that's not reasonable for most people gives you an idea of what to target.

 

I bought a new XS821 this fall, but I must have got old stock. My new 900r is only turning 7600 with this belt. Hopefully she loosens up soon.

 

They mentioned that just clicking up one clicker would fix the issue, if any - not sure if the 900r has that option or not.

 

Longer would raise rpms. the 821 was good belt for a shorter Z measurement and fast conditions, better for drag than on and off throttle in trails, for my riding anyhow. IF they made them longer it would be an improvement.

 

What about XS823? Little longer would raise RPMS? REVCO lists 823 for the expo 900T R.....

 

Any new feedback on the new XS821 belt?

 

I might be out this Sunday if the warm kick doesn’t ruin the couple of spots I am thinking will be okay for at least a quick rip. If not, it’s the Canada trip the following weekend. Tough year for R&D.

 

Got one in this week. After break in i see a ramp up of 225+ rpm versus my 3500 km old 821. Could not noticed difference in length. Clutches still clean. Getting my 8000 back with just the belt, am not sure i would have choosen the red-yellow Dalton + Doo 350 as a refresh last week. (not received/installed yet)
Seem to me that this more gummy compound thing tagged to the 821 was not much so than its side profile.

 

I have one of the newer versions of this belt. I had a chance to break it in and put about 120 miles on it. I have a HRSS clutch kit that is set up per their instructions and I haven’t touched the calibration. This belt pulls 8-8100 very consistently, again no changes to clutching. I FEEL like this sled has never pulled to 90 this quickly. I am VERY happy with this set up.

 

My distributor has had the XS821 showing backorder for the entire season. It will likely be next season before I get to try a new one.

 

You can’t just go on eBay or amazon a get one there?

 

this is a great post, thanks for sharing DenonO

i bought a new xs821 about a month ago not knowing about the change. just went out to the garage to have a look and you can clearly see the difference between the old and new

 

Still waiting for a honest back to back comparison, old vs new.
A 531,571, g boost all rev higher and all are slower. Hope they didn't wreck a good thing.

 

Just bought an XS821 to replace my 571 that went bad on me and am noticing some fairly significant track creep with the backend lifted up. Just wondering if this is the belt itself aka too much belt tension or if it's something else.

 

Did you adjust the secondary clutch to reduce the creep? New belt is probably a little thicker than a used one; need for adjustment isn't unusual

 

On the old ones I always found they needed a few hundred miles to settle in too.

I have one on my 900R, it consistently pulls 7,900 now it's settled in.

That's the old style, I have no experience with the new one yet.

 

I sure hope they didnt neuter those belts. Its all we have for high hp options. I just got 5 new ones from the main hub, guess i will have to look at them closer

 

I can't visually see a difference between the new version and the old. Unless the one i just got this week is the old style but i would be surprised. Do we know of anyway to distinguish between the old and new.
The true test will be to run one then the other back to back.

 

look at the ribs

 

 

old on top new one bottom

 

Thanks Ken that's great information.
So as it stands i have 2 older styles with the smaller top cogs and my new one is the newer style.

 

I noticed a difference - I have HRSS clutching and on the old belt had to drop some weight to get it to pull RPM. I went back to "stock" weighting before even trying the new one, and am happy to say it's nailing top end.

The initial few km were outrageously good performance at -15 C. By the end of the day at -2 it felt just the tiniest bit lazier. I may drop a magnet close to the pivot. Otherwise, no complaints with the new style, but I am NOT the right person to judge - seat of the pants and fun factor are all I care about, and I have no official evidence whatsoever to back up my claims.