Im running an '03 prox 800 with and slp single pipe. I'm running a 66-44 helix (per slp technician) I just got a good deal on a primary spring with compression weights of 140-330. Im also running 10-66 weights. What secondary spring should i run? And is the forementioned setup good for running below 3000 feet? Thanx in advance.

That clutching is wayy to light for a piped 800. More weight and or bigger helix. You should be running at least 68gm weights.

Dalton 70's with that helix and primary spring. Stock secondary spring. Ideally that primary spring is too stiff at shift out. Replace the secondary spring with a new black one, 155/222 poundage, and 3 delrin washers.

This is the helix and weights recommended by the techs at SLP for my area. Thanx for the info though.

I dont want to start a fight but SLP is a mountain sled company...... Clutching experts for flat lander /ditch experts they are NOT. Jetting for us flatlanders they are out to lunch on also ! Having said that get a Team 420720 helix , 140-310 primary spring ,10-68 (min) or maybe 70 gram daltons , Black/red secondary 155-222 spring. set your belt side clearance to .015"~.020" max with a new belt. with 440 MAX main jets you should have a very fast sled !

Form your own opinion based on past post , Pockets knows what he is talking about ! If you do run SLP set up it will over rev , your target RPM max is 7850~7900 on a 800 twin with a single slp pipe.

The 10-66 are too light for any single piped sled, no matter what SLP says. It may not overrev, just it will not accelerate as hard as weighing it down. My brother-in-laws prox800 used hot seat 66 grams in Yellowstone, with the stock 62/46-.46 helix, no problem with rpm.

What about on a long track Pro-X such as mine. I've been using some 10-66's for flatland riding(1300 ft.) i didn't figure I'd be able to pull larger weights with the long track. Should I try some 10-68's?

So your saying i should lean it out more. The stock main jets in the prox 800 are 450's, i have the needle on the third setting. Will this be adequet? What are the angles on that helix that you suggested? I really appreciate your help. Thanx, sean

So are you sayimg i should go with 70 gram weights or 66 gram weights?

yellowstone is at 6600 feet, he was saying that they are too light for low elevation. you need a 68 or 70 to load the engine which gives you better acceleration given the rest of the clutching is correct.

has anybody tried the 11 series poo weights on the 800 twins? also why the daltons, does poo not make a 70 gram weight? i was told by dalton tech that there profile and weight distrobution is very very close to the same as poo's 10 series weights.

To the bold. What makes them different and are they really that much better???

mr.prox I currently use Polaris 10-70 weights on my 800.