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I've got the best result on mine last year with 120-310 spring 10-70 weight 50-44f helix with delin washer 153-222 spring 1.79 ratio lightly studded Switchback 800 pro-s riding in quebec city only! fast trail setup

I would try 2 more gram with a stiffer spring if i were you! should bring it to 8100! you may also have a backshift problem if falling so soon.. so maybe a stiffer rear spring could do the trick! (excuse my english)

One more XC 129 850 !!! I'm picking a blue one with lime green accent and blue tunnel!.. also choose storm track! can't wait to ride this thing. Leaving my loved Pro-s.. hopping to not regret..lol

if your ajustement are all right! then you can begin clutching one parts at the time!! i suggest getting rid of gold spring for a 120-310, engagment will rise at 3800 and you mey also need to add 2 gram! but it will pull alot harder just from that!! my first mod was the 1.76 ratio tho!..

AHhaha Exactly what i was thinking!!,,

Can't wait to see those clutching thread in the Indy xc section!..loll I'm getting one for sure!

I have try some recommandation of brock on mine! Switch 800 pro-s, and it work's very good! 10-15 km/h more top end and better mid punch, try 10-68 weight in the primary ( or ajustable set to 69 with a lot on tips ) 120-310 primary spring 1.73-74 ratio begin with this to see if you like where...

Yup i think it's the ideal rpm!! I heard that the 2018 like ran higher tho..!

i ran against one in our crew a couple time! he's clutched/geared, I'm clutch/geared, take 1-2 sled lenght until 80mph..after that it's like hitting the brake..lolll

^^^^^^ Exactly!! ^^^^^^^^^^^exact setup as me !! for very good in all condition! gates belts too.

165 km/h Gps, Still pulling, on a groomed trail, 8150rpm steady

i think you'll love your switchback! 2 years with mine! No issue so far! Just Pure fuN!

I have pretty much the same setup as you but on a pro-s ! i switch the 140-220 to a 140-200 last week! a gain a little mph up top but lose a little backshift, nothing to worry about if your looking for a better top speed! 164km/h with the 140-220 on hard pack (-25deg celcius) 165 km/h on 3 inch...

After the spring swap it only turn 7900-8000rpm , i grind 1 gram off my modded 66’ and gain back my 8100-8200! I’m doin 170km/h gps now on 2-3 inch flufy snow!.

a little!! i gain 8-10 km/h between a 140-220 and now a 140-200 (but lose 100-150 rpm)

Gate belt also work good for me!! Gain 3 mp top and more consistant rpm!! i'm not sur it will be enough to beat those 850 tho, i have two of them in my group and 1 800 etec and they are fast.. We were supposed to line up today but it's snowing bad around here so keep you in touch if it work...

i think 107 mph is good! i have a 1.76 ratio with 120-310 spring and 50-44fp with 140-200 spring, i have awesome holeshot and my top speed is between 105-110 (gps). trail riding is arm stretching good!..lol. oh and i have modded my 66' stock weight to 69.5 with more tips weight ( 2 on the tips...

love the site guy's, keep up!!

first sled i try is a Rush-pro r two year ago! .. fall in love fast with it! fun to drive!! all my friend ride brp's! switching to axys was just icing on the cake!

Nice sled Shwantz !! Any chance you have more pics for us!. Lol i’m in quebec if you ever come around here! Hit me up!. Want to see that in person! Brock also gave me the right direction to go and it work’s great on mine too!.