Primary spring suggestion for 1000 - HCS Snowmobile Forums

XFire 128/Firecat(03-06 & 09-?) 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 01-03-2020, 08:23 AM   #1 (permalink)
Join Date: Jan 2018
Posts: 15
Location: Northern michigan
Default Primary spring suggestion for 1000

Sled is an 09 cfr 1000, 136 ext. Came with a BMP torsional kit. Yellow spring in secondary, blue in primary.

It grabs later and harder than I would like, around 4500 rpms. Makes low speed maneuverability difficult. I already took primary apart, cleaned, and made sure everything was smooth.

Here are the spring rates I have found-
Stock purple-121-240
Bmp blue-140-300 (installed)
My brother sent me two from speedworx.
They are 120-310 and 125-340.

125 would prob be perfect however idk what the downside would be to using a much higher compressed rate (340). The secondary mostly controls the shifting right?

It has BMP's adjustable primary weights, but I do not know how much weight is installed. I'm assuming that's more of a fine tuning aid. Unless they are way off....

Also, I do not know if all those spring rates are specified at equal compression heights.

I just want to lower my launch rpm a little and of course not overspeed my engine. Although I do not rip across lakes and am rarely above 70 mph.
Leadneck is offline   Reply With Quote
Sponsored Links
Old 01-03-2020, 03:53 PM   #2 (permalink)
Super Advanced Member
Boom2's Avatar
Join Date: Dec 2013
Posts: 1,698
Current Sled(s): 19 ZR8000 RR, 18 High Country 8000 LTD, 11 Z1
Previous Sled(s): Too many to list
Location: West Quebec
Favorite Riding Area: Quebec
19-20 Mileage: 4200
18-19 Mileage: 3800
17-18 Mileage: 2600
16-17 Mileage: 2400
Age: 67
Riding Since: 66

I used the yellow white Cat in the drive clutch and an orange in the secondary. Worked nice and still with enough rpms to launch it well but not to high. No torsional set up all stock.
Boom2 is offline   Reply With Quote
Old 01-03-2020, 08:21 PM   #3 (permalink)
Super Advanced Member
Join Date: Mar 2003
Posts: 20,003
Current Sled(s): "Agri-vator"

Put the 120-310 in. A common thing with those was to shim the spider, as it increases belt grip and lowers engagement, making better use of the 1000's torque.
stronger800 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 01:55 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.