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#166 MX-Z Man

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Posted 13 March 2021 - 07:17 AM

^^^ Thats the belt. Today its a Timkin XS821 as Timkin bought Carlisle, you bought Dayco back in the day.

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The XP was the most fun sled ever made - but I liked my XR more. The 850 takes it to a whole different level. But darn, the 900T is Bad to The Bone! 

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#167 Mach21

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Posted 13 March 2021 - 12:35 PM

So if you go to the XS821 you have to click up to clicker 4 right, as that belt will bring your R’s down some compared to stock 571. I got a 1000 miles on my 571 this year...with no issues at all. Just curious how these XS 821’s and gboost are. Sounds good what’s been said so far.

#168 Couch1

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Posted 13 March 2021 - 01:52 PM

The xs 821 will pull rpm’s down on some sleds doesn’t seem to be all. Some have suggested sleds on the longer C to C side are more likely to lose rpm because the 821 are a little shorter and load harder than the 571. With gboost and stock clutching you’ll probably have to add weight to the pivot bolt to keep rpms where you want them. I don’t know how much because I ran HRSS ramps all year, but a gram or 2 would probably be close. I should add the gboost seems to take a bit longer to break in I wouldn’t make any adjustments till you have a 100 miles on the belt

Edited by Couch1, 13 March 2021 - 02:08 PM.


#169 Jeb©

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Posted 14 March 2021 - 11:02 AM

The xs 821 will pull rpm’s down on some sleds doesn’t seem to be all. Some have suggested sleds on the longer C to C side are more likely to lose rpm because the 821 are a little shorter and load harder than the 571. With gboost and stock clutching you’ll probably have to add weight to the pivot bolt to keep rpms where you want them. I don’t know how much because I ran HRSS ramps all year, but a gram or 2 would probably be close. I should add the gboost seems to take a bit longer to break in I wouldn’t make any adjustments till you have a 100 miles on the belt

2-3g on the pivot for a gboost. You are correct, an 821 is short, if you have a proper Z measurement the 821 loads really hard, they are 44", gboost are 44.25 and 571 are getting close to 44.5"


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