Switchback Assault Clutching - HCS Snowmobile Forums

Switchback Assault/RMK (Pro-Ride Chassis) This is a brand-specific forum. Posts on this forum are assumed to be questions aimed at similar model owners, and are not looking for comments of a sarcastic or "bashing" nature. Please be aware that if you violate this policy you are in danger of losing your posting privileges on this website.The calling out or posting of another members personal information IE phone number or address is prohibited.

LinkBack Thread Tools
Old 01-05-2020, 02:09 PM   #1 (permalink)
11mnassault's Avatar
Join Date: Jan 2020
Posts: 1
Current Sled(s): 2011 Polaris SBA 800
Location: Minnesota
Favorite Riding Area: Northern WI
Age: 17
Riding Since: 2002
Default Switchback Assault Clutching

Hi guys, long time reader but this is my first post as I bought my first sled early this winter. Picked up a 2011 SBA with 4300 miles. Top-end was rebuilt with a BMP "Fix-IT" kit and has the 1.352" track. It has been running strong (always starts first or second pull) only it seems to rev only until 7700rpm. I know peak power is made at higher rpm and the general rule is to shoot for about 8200-8250rpm. I am running at sea level (0-1000ft) The guy gave me two sets of clutch weights, 10-66 and 10-68. The 10-68 are currently installed, and with those, it revs to about 7700rpm at the highest. If I'm riding at sea level do you thing putting in the 10-66s will solve my problem? What are the stock weights? Any advice would be greatly appreciated, just trying to help my sled run as best as possible and I know you guys have the knowledge to help me make that happen, Thanks in advance!
11mnassault is offline   Reply With Quote
Sponsored Links
Old 01-05-2020, 03:34 PM   #2 (permalink)
Super Advanced Member
ivar's Avatar
Join Date: Apr 2004
Posts: 16,706
Current Sled(s): 2019 SBA 850
Previous Sled(s): too many to choose from
Location: Spitsbergen / Norway

10-66 was stock in mine. It revved to 8250-8300. I'd try those first.

Also new springs in the clutches if unsure of age
2019 SBA 850,2015 600 Adventure (int'l)
09 Doo 1200 GTX, 02 XC800 / 00 XCR800 - Pro-X rear skid, 99 XC700SP
RIP: 800SBA, 02 XC800, 99 SKS700, 97 XLT SKS
ivar is online now   Reply With Quote
Old 01-05-2020, 04:31 PM   #3 (permalink)
Super Advanced Member
Lexuslover's Avatar
Join Date: Apr 2013
Posts: 3,757
Current Sled(s): 2012 Switchback Pro R 800
Previous Sled(s): 2001 800XC 1999 XLTSP
Location: Manitoba

10-66 is stock. switch the 68s out to 66 and you should be hitting the 8050-8100 you need. and yes, new springs do wonders.
Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2020-01-05 at 2.33.44 PM.png
Views:	20
Size:	157.5 KB
ID:	2069658  

Last edited by Lexuslover; 01-05-2020 at 04:34 PM.
Lexuslover is offline   Reply With Quote
Old 01-06-2020, 07:42 AM   #4 (permalink)
Super Advanced Member
Join Date: Dec 2016
Posts: 111
Current Sled(s): 17 800 pro s s/b
Location: Ontario ,H.Landing
Favorite Riding Area: The Highlands
Age: 47
Riding Since: 12

Condition of belt? Clean valves? Rollers in primary clutch? Not going to gain 500 rpm with stock 66gram weights. Something else is going on.

Last edited by mtzz; 01-06-2020 at 08:22 AM.
mtzz is offline   Reply With Quote
Old 01-06-2020, 10:28 AM   #5 (permalink)
Super Advanced Member
Join Date: Jan 2017
Posts: 2,559
Current Sled(s): 2013 Rush Pro R 800 retro 2001 XCSP 700
Location: Mn
19-20 Mileage:
18-19 Mileage: 1400
17-18 Mileage: 1200
16-17 Mileage: 1000

It's possible some parts are worn in the primary clutch too. Could be a lot of things. My XC would only rev to 7600 when I first got it, it was a combo of worn rollers and pins, clutch weight bushings, weak springs, etc. Rebuilt the primary clutch and it came alive.

But as said above, a new belt, fresh springs in both clutches, a delrin washer in secondary, clean valves, check belt and chain tension, and make sure clutch is in good condition. Also, TPS could need adjusting. The joys of a snowmobiler, lol. That is a fun machine though and worth getting to run tip top

If your primary spring is weak, or broken? A new one with the 66's could fix it up too. It's common for those springs to break, and would cause low rpm.
Frankie406 is offline   Reply With Quote
Sponsored Links

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 08:44 PM.

Powered by vBulletin® Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.