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Blue or Yellow primary spring ?

Frostbite

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Dec 15, 2007
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Eastern Washington
The spring radical rider suggests is a great spring. i have several of them. So are the Speedwerx H5 alloy springs. I am hooked on them now. I can't remember the colors right now but i think there is a red/white 120/340 and a blue/white 120/310. Although on paper the 120/340 should work better. On both my M8 and M8000 I have gotten a bog right off clutch engagement. For that reason alone, I now use the 120/310 H5 primary springs.
 

Storskogen

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Jan 17, 2014
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Sweden
The spring radical rider suggests is a great spring. i have several of them. So are the Speedwerx H5 alloy springs. I am hooked on them now. I can't remember the colors right now but i think there is a red/white 120/340 and a blue/white 120/310. Although on paper the 120/340 should work better. On both my M8 and M8000 I have gotten a bog right off clutch engagement. For that reason alone, I now use the 120/310 H5 primary springs.

What is the engagement RPM when bog and not? I have a Speedwerx-kit but had to put a shim on in the clutch to be able to drive slower than 30km/h (under 30km/h it stopped moving forward ) and I think it might be why I have a bog.

M800 -13, Speedwerx full exhaust, PCV. BC WT 660T -06
 

kanedog

Undefeated mountain clutching champ of the world.
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Oct 14, 2008
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That is the recommended spring with MDS weights.

The 340 finish rate is quite stiff and it likes to break is what I have found.

Sent from my SM-G920W8 using Tapatalk
 

summ8rmk

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Feb 16, 2008
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yakima, wa.
They last longer on trail queens.

Sent from my SM-G920W8 using Tapatalk
I am what I am. Flatlander....
And i get thousands of miles out of every snowmobile without rebuilding.
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