I have a x2 600 witch im going to race in a easier hillcross/snocross thing we got here in sweden. Since the holeshot is the most important in that kind of race, im wondering if the 600 manage to pull the 70/44 helix? Also i´m not sure what gearratio i should be aiming at. stock is 23/39, and that seems way high to me!? I think around 1.90 should be fine, or...? The speed is never over 65-75 or something like that, so i dont need topspeed.... Need holeshot and backshift.
The dealer convinced me to buy heelclickers, and the 70/44.46 seems to be popular around here, along with the stock red/dk.blue sec spring.
Any comments, more tips?

Your clutching seems to be fine. You will have same setup as the 440. switch to almond/red primary spring also. As far as gearing if your only going to hit 65-75 I would go with something like 19/43 (2.26). This will allow you to use the stock chain. Or 19/41 something in there you can still hit 80mph.

You mean switching the gold spring that come in the hc-kit, to the almond/red one? Now I got 10-62 with a notch and almond/red and it engage at about the right rpms, but to hard-slams in. Wants it a little smoother, a few days with the clickers as soon the snow arrives..
So you think i can go as low as the 440, 19/43. ok.
Yeah, do the gearing-chart for the Edge, matches the prox2 aswell, Chainpitch and so? (coming from skidoo....)
Thanks alot!

Whats the spring rate of the gold spring you have? I thought you just had the stock primary. Not saying you have to gear that low, but if all you need are quick short runs like snocross thats where you want to be. The pro x and the edge use the same 7.92 chaincase.

Dont have the specs for the gold spring, its the one included in the heelclicker kit. Haven´t picked it up yet so I cant check.
Almond/red and 10-60/62 seems to be a good way to go, but I think I´ll give the Hc a shoot so I can finetune it after the type of race-track, they sure can be different from race to race.
Should go trough the gearing-chart and see what I come up with on the gearing.
I´m running in the stock class, not allowed to do much more than clutching/gearing, not even studs.

190/340 is the spring weight on the spring

For gears, run no smaller than a 19 top, and pick a ratio which has the chain running with the least amount of slack. 19/43 with a 74p chain, or 20/42 with a 74P. Good for 76 and 82 mph.

If that spring is 190/340 with out studs your going to be spinning alot. Might want to go with a lower engagement 150/310.

The start is from snowmobiletracks attached to the ground, so you can have quite high engagement. Had 5000 rpms on my mxz last year, and I could even have had it a little higher.
At the gearingchart I have the biggest bottomgear is 41, is there an updated one around?

With heel clicker weights you need a much stiffer engagement spring since it has the heel which lowers engagement. Had heel clickers on my xc700 and had no mor than 42-4400 with that spring.

You can adjust the engagement by adding/remove the weight (i´ve read), but how much can you change it? 4400 seems to low for my purpose, but that should depend on how much weight you put on.
Had only theoretical knowledge about them, never tuned them myself, going to get help from a guy who has alot of experiance with them. We´ll see...

Never used the HC weights so not sure how they work. The gear chart should go up to a 43 bottom gear. I think someone posted one on here a while back.

Searched the forum all night, but dont find that chart, only the one up to 41 bottomgear. Anyone know were to find it?

Heres what Ive just got done testing;

600ev prox
136 x 1.5" track

EPI PS-13 Gold primary spring
EPI PDS-16 Purple Team spring
70/44.46 helix
10-58
22:40 74p

It was engaging around 5050-5100
peak rpm 8050-8100 Calibrated tach

No idea of top end, but it pulls very hard, much quicker than the other viper or mxz700 to about 75mph. The backshift is also very strong.

If i was starting off a mat i would run engagment as high as i could without the belt sliping do you have rules to avide by? Another thing to watch out for is when you leave the mat you dont upshift to fast !!!!!!!

Is your clutch already cut for HC's from the factory ? Because if it didn't come that way stock I don't think you can modify it ( cut for clearance for HC's) and run in stock classes. If you can run them , make sure they reshim the spider. :div20:

Yeah, I belive I can have an engagement around 5000, and still have grip. But what do you mean not upshifting to fast after I left the mat?
And what rules did you think of?




Here in sweden we´re allowed to cut out for the Hc, no problem there!
And I be sure to reshim the spider, its way out as it is now.Do you know what clearence should it be?
The previous owner didn´t care much about anything at all, thats for sure....

Oh! right! Does anybody have the gearingchart with that goes to 43 bottomgear? Would be much greatful for that.

When you leave the mat as soon as your off of it, if u feel the sled over-rev- up shift too fast the race is lost because you will be out of the powerband. You can also watch the tach or if you have a playback tach (vdo)you can play the run back,you will see it if the tach jumps 300-400 rpm you have over shifted

See your point on overreving, but upshifting to fast should drop your rpm´s, not raise them!? Upshifting-making the sled working in a higher ratio, or...?
Want it to shift out as fast as possible without the rpm´s going down.
It can be difficult to get it perfect, since when at the mat theres no trackspin at all, and after the mat it´s all snow and ice.
But since the first corner is after 150-200 feet, all advantage over the others is valuable, making the mat-takeof crucial..