nytro xtx clutch spring

[nytro11tom]

I installed the 14.5 rollers on my xtx nytro, what is the best pink spring to install to lower my engagement a little more and hold my shift out rpms were they are supposed to be? I have no snow to test it,I'am 250 lbs with all my gear.

 

[TJSHORES]

Installed 14.5mm rollers in my XTX with B-P-B spring originally. Had 3150rpm engagement, but shift out was a little slow. Switched to Y-P-Y spring and engagement was 3200rpm with comparable shift to stock IMO. Only have one trip on it with Y-P-Y, but i love it so far. Also I lost 50% of my engine braking with this setup (which was a plus for me in powder). I'm strictly off trail riding at 230# with a 1.75" BC track geared down one tooth. The 14.5mm rollers will make a diff on there own in lowing engagement.

 

[kurtasaurus80]

I also have the y-p-y in my xtx; I do have stock rollers and weights. I mostly ride trails. I love the lower engagement and the lack of engine braking.

 

[nytro11tom]

Should I raise or lower my spring tension on my secondary with the y-p-y

 

[kurtasaurus80]

I tightened my secondary up one to 90 degrees. think its 3-6

 

[nytro11tom]

Didn't tightening the secondary make it backshift faster adding to the engine braking

 

[nytro11tom]

bump

 

[UP bushman]

Backshift is controlled by the degree of helix and the preload of the secondary spring. A lower 39 degree helix will backshift faster than a 43 degree helix is the theory. The secondary spring operates like this. The spring rate is the twist on the helix. The preload is the backshift when decelerating. Spring change can be a little help but helix change is best to change backshift.

 

[jbern58]

Backshift is controlled by the degree of helix and the preload of the secondary spring. A lower 39 degree helix will backshift faster than a 43 degree helix is the theory. The secondary spring operates like this. The spring rate is the twist on the helix. The preload is the backshift when decelerating. Spring change can be a little help but helix change is best to change backshift.

Thanks for this explanation! I am going through and refreshing my clutches now on my stock 5,000 mile Nytro XTX. Putting a little bit bigger lug track on as well (1.35") I am also changing to 14.5 rollers and Y-P-Y primary spring. Is there a different secondary spring you'd suggest? Or a certain degree setting on the Helix perhaps? I am in Wisconsin doing mostly all trail riding at 700-800 ft elevation. Thanks in advance!