hi guys, presently have 200/320 primary spring in my mxz700, all else being equal, what would a 160/260 do for me? I'm guessing softer engagement with quicker upshift....any detrimental effect that you could foresee? I always hear about putting in heavier weights, isn't it easier to change a spring??? Or is it that you are able to do so much more fine tuning with weights vs springs?

kielbasa:It would kill your engagement and shift rpm,in otherwords it would lower both. Dino

but shift rpm would come back up to normal once it's tapped out across the lake, right?

your engine should run at a certain rpm to make most power,the lighter spring will load the motor harder and bring down your rpm .might be o.k with with a stiffer secondary spring

You would have to take allot of weigt out of the clutch and even move up the clickers and it MIGHT work. The TRA can be a bit different than flyweight clutches when it comes to tuning, and changes at the secondary do not make such drastic effects on RPM except during full shift.

I run 215-375 goodwin red spring in my 700.I would bet the 700 would become a big dog with the 160-260 until it had a very long strech to get going.

You called it right, a softer engagement and a quicker upshift, it will bog the motor. Let us in on what you want and I`m sure somebody will offer some worthwhile advice, its easier to go backwards than forward, especially with so many tra combo`s dont doo a crapshoot , theres way too many variables..

the 700 goes good with a 230-380 19 grams with a 50 cam (drag set up)

With all variables staying the same, that spring will make you slower. Your engagement will come on to quick,and shift out rpm will be less.Adding more weight will drop peak rpm even more.More weight loads the motor more,so you'd want more shift-out spring pressure to add more weight. You also could try the stock spring with slightly more weight, and adjust your clickers.SKI-DOO has a racing manual that is very informative on clutching,jetting,etc.

well, that's what I want, softer engagement with quicker upshift and nice coasting...as far as I'm concerned smooth is the name of the game, I wanna use some of that low end torque these twins are supposed to have without it having to be clutched like a high strung 440....I come from the old days so bear with me....

I would not want a lower engagement than it has stock,but if thats what you want I would just get adjustable pins and add some weight,using stock spring.but I think you will find it will be slower in the end. ??? ,so I ask why?

You cant just change springs,and leave the rest allown.The motor will load very quickly and bog out until enough rpms are built to accellerate.On top of that your peak rpm will drop and you wont be in the power band.As I said before this makes the sled slower.Yes, a softer spring will shift quicker,but you wont build enough power,to launch the sled.Remember theres a give and take for everything you change.

I should rephrase that...I want a SMOOTHER engagement, doesn't necessarily mean lower I suppose...I do understand too weak a primary spring will bog the motor, but I want the throttle just cracked open to cruise steady at 70 mph like my vmax4 does, not 1/4 and engine screaming....that's what I'm getting at, the hard engagements and backshifting are fun, but gets old on a long day...ever notice the better racers/drivers are smooth and not all over the gas/brake like some posers? I guess that's another thing I'm getting at, I don't need the killer backshift as I seldom let off the gas or use the brakes.....not bragging or trying to step on anybodies toes, just telling it the way I see it...

OK! Now your comparing a 4cyl. motor to a 2cyl.Most 4 and triple motors have a smoother power delivery than twins.I'm talking stock clutch calibrations now.I don't want to give you advice that will lesson the performance of your sled,generally de-tune a nice performing machine.Maybe you should consider a touring sled rather than a high-performance bump sled!

problem is my high performance bump sled isn't high performance enough, made for kids suspensionwise...enough of this talk, this is finally a decent forum for people who want real answers and I don't want to turn this into the fluffy crap that drove away the gearheads from amsnow... :)

Thanks!! :thumbsup:

Disable the RER, install a Formula secondary with a 50 cam, yellow secondary spring (415092800) set at 15 lbs.
Install a BL/BL (130-290) primary spring with 299 ramps.
This is a proven setup that will soften engagement and eliminate the engine braking sensation. The trade off is no RER (If you have it) and a slower acceleration rate. Any Ski-Doo 700-800 should cruise 60-70 mph with only 1/4" of throttle travel, if not, clutching is probably not the problem and you'll have to look elsewhere.

Originally posted by idooski@Jul 8 2003, 07:42 PM
Thanks!! :thumbsup:
I'm with idooski, Thanks!! :thumbsup:





SWRules

Sounds like you want a smoother ramp profile and put in the black RER spring which will shift you into "higher gear" quicker . I assume you are looking for gas milage. You can take your existing ramps and grind the initial "bump" off which is your engagement. Or go to a 286 ramp. Good all around smooth ramp. The RER Secondary carrys a lot of stiffness which is why your motor seems to rev high when cruising. This keeps the twin in the power all the time. The black spring will help you.