What are you 670 drivers running your secondary at.
I was told by the guys At DNR to go with a 50/47 helix set at 18 lbs and put in the new 2002 year White spring.
Anybody have experience with this?

The longtrack is going to make a difference in what helix and springs to use.

What year is your 670?

Here is my HO longtrack set up. Stock ramps, stock spring, 17.5 gram pins, 50 degree helix, beige spring set at 18lbs. 22/43 gearing and I use the ski-doo gold belt. This for flatland riding, for 10,000 feet I remove 5 grams from the pins and use a 200/350 spring. I am running a 136 X 1.5 track.

On my 98 670x HO I've got 47 deg helix, beige spring set on C6, it seems that 16-18 lbs works the best.

Hey dulie, *Did you end up trying this setup? *If so, how did it work out?

I thinking of getting a white spring and trying this, *(except for i will be using a BI helix.)

Not Yet, I ride every weekend so I spend my afternoons during the week doing honey-doos. I`m also getting the parts together to long track this sled so I'll probably do all my stuff at the same time.

My SummitX setup at 1000' altitude is 16.3 gram solid pins, 160/290 spring, 287 ramps. *Goodwin Blue at C-6, teflon buttons and stock 47 deg helix.