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Discussion Starter #1
My sled is running 8300-8350 rpm, XC 850, Patriot recommended the 10-74 weights and I stopped by the dealer and bought them for $100. My question is do i need a helix spring change also and those of you who have a similar 8300+ revving XC what are you using?
 

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My sled is running 8300-8350 rpm, XC 850, Patriot recommended the 10-74 weights and I stopped by the dealer and bought them for $100. My question is do i need a helix spring change also and those of you who have a similar 8300+ revving XC what are you using?
With your sled overrevving you couldn't talk the dealership into giving you free weights, especially with this new motor.
 

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Discussion Starter #3
Seems all sleds need some adjustment. Didn’t even consider asking the dealer. My sled has been flawless just want to run past my 3 brothers who are all on doo 850s
 

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My sled is running 8300-8350 rpm, XC 850, Patriot recommended the 10-74 weights and I stopped by the dealer and bought them for $100. My question is do i need a helix spring change also and those of you who have a similar 8300+ revving XC what are you using?
You shouldn't need any other changes.:bc:
 

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Discussion Starter #5
Swet! I’ll get them installed in the next day or 2 and let r rip. Won’t be able to run the 850 Doos for another week or so but will report back once i do.
 

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My sled is running 8300-8350 rpm, XC 850, Patriot recommended the 10-74 weights and I stopped by the dealer and bought them for $100. My question is do i need a helix spring change also and those of you who have a similar 8300+ revving XC what are you using?
was turning consistent 8250 with some 8300 flashes put in 10-74 now 8150-8200 its definitely stronger and worth doing. cobra track studded 550 miles still not happy with top end hits a wall at 102 105 max on good lake conditions
 

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Discussion Starter #8
I am getting 105 on speedo with factory weights and as already discussed at 8300 - 8350 rpm. Sounds like i am leaving 5 + horsepower on the table. Will report back after i install and test the 10-74 weights.
 

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My buddy is using Dalton QAP5s at 75g pulling 8100-8200. He has the 1.5" track. These 850s start slowing down at 93-94mph area. He's going to try taller gearing to gain some top end. Bottom and mid is very good but lacking top end.
 

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I find the same thing. I have just under 200miles on mine (7hrs runtime). Topspeed bouncing up and down on the lake is 107. I have hit 113 on a smooth part of the run which is mostly ice.( Rpms 8150 to 8200) I have a cobra track with 135 triggers with the big ass windshield and mirrors.
 

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VR1 850 129, VR1 650 129
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My sled is running 8300-8350 rpm, XC 850, Patriot recommended the 10-74 weights and I stopped by the dealer and bought them for $100. My question is do i need a helix spring change also and those of you who have a similar 8300+ revving XC what are you using?
Depending on conditions and temperature 74 grams may be a little heavy or a little light at times. I know adjustable weights cost more than standard weights but you have the ability to add or subtract weight per conditions. There are many choices out there. I like Dalton’s QAP -4 weights for the poo 840.
 

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The Meat Man
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You can buy these specialized clutch weights from Tommcat Performance. :whistle:
@tommy :lol::lol::lol::lol3:

What not to do. :thumbsup:
 

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The Meat Man
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Forgive me Tommy will get a kick out of my last post. :bc:

8100 RPM sounds like a good mark to me. :bc:
 
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The Storm track is not going to be as fast guys. It’s geared lower right out of the box for that track. But man does it come shooting out of the corners. Has anybody tried higher gears with the Storm track yet. Not sure that it would pull as well.
 

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Check your weights to see what they actually weigh. The stock weights ranged from 72.32 to 72.88 that were in my sled. I ground the side of the heavy weights so they are all at 72.32 and after break in the sled now runs 8250 to 8300. If you have all three @ 72.88 your basically running a 73 gram weigh so that could be why some are running a closer RPM stock. I'm installing SLP Magnum Force adjustable weights adjusted to 72.1 grams. SLP states these act like a heaver weight.
 

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The Storm track is not going to be as fast guys. It’s geared lower right out of the box for that track. But man does it come shooting out of the corners. Has anybody tried higher gears with the Storm track yet. Not sure that it would pull as well.
Yes 23-40 lost the amazing bottom end grunt. Feels like my 800 switchback. Was 8100 now 7850 gained 10 mph on speedo need to reprogram for proper reading
 

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VR1 850 129, VR1 650 129
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Check your weights to see what they actually weigh. The stock weights ranged from 72.32 to 72.88 that were in my sled. I ground the side of the heavy weights so they are all at 72.32 and after break in the sled now runs 7250 to 7300. If you have all three @ 72.88 your basically running a 73 gram weigh so that could be why some are running a closer RPM stock. I'm installing SLP Magnum Force adjustable weights adjusted to 72.1 grams. SLP states these act like a heaver weight.
I ran the magnum force weights last year in an Assault. They do act heavier.
 

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Check your weights to see what they actually weigh. The stock weights ranged from 72.32 to 72.88 that were in my sled. I ground the side of the heavy weights so they are all at 72.32 and after break in the sled now runs 7250 to 7300. If you have all three @ 72.88 your basically running a 73 gram weigh so that could be why some are running a closer RPM stock. I'm installing SLP Magnum Force adjustable weights adjusted to 72.1 grams. SLP states these act like a heaver weight.
I suspect you mean 8250-8300 Doug.

Keep in mind that belt side clearance varies between sleds as well. This can alter rpms as the weights swing outward more all the way through the upshift if too much side clearance. This is one reason the Gates belt usually gains rpm because it reduces side clearance.

We are riding Tuesday and I have .034" side clearance on a new Polaris 1215 belt. RPMs are 8150-8200. I have a Gates belt as my spare and will try it during the ride.:bc:
 

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The Storm track is not going to be as fast guys. It’s geared lower right out of the box for that track. But man does it come shooting out of the corners. Has anybody tried higher gears with the Storm track yet. Not sure that it would pull as well.
The 850 INDY should be able to easily break 100mph.
My Indy with 1.5” lug walks away from the 850 with stiorm track.
I can get 108 on the guage for MPH.
Change the gearing to 1:74 and it’s going to be faster on top end.
 
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