CLUTCH SPECS ON THE PRE-PRODUCTION 2019 850 Patriot sleds.

mountainhorse · Mar 9, 2018

For 8-9k feet

10-68 Weights (+4 grams from the 2018 800 Pro w/10-64's)

120/320 drive spring (same as the 2018 800 PRO)

155/222 driven spring

Straight 42 helix (+2˚ from 2018 800 PRO)

@ 8250 RPM.... I'm told it has really flat power curve from 8000-8400

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aksledjunkie · Mar 9, 2018

Wow 4 grams more and pulling a steeper helix. Secondary spring finish rate changed by 2# or is that a typo and its really 222?

mountainhorse · Mar 9, 2018

Typo... my bad.

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chriswelters · Mar 9, 2018

Same weight my 800 pulled at low elevation. Im excited to get one.

edgey · Mar 9, 2018

What's the QD gear ratio and driver size on the 850?

mountainhorse · Mar 10, 2018

edgey said:
What's the QD gear ratio and driver size on the 850?

Same as the 800's from 2018/17/16

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richracer1 · Mar 10, 2018

Interesting, may be apples to oranges, but my BMP 860 engine is running Goldstar weights set at 71.6 and a 120/340 spring and depending on snow conditions, I'll see 8250-8350 on a good pull. This is with a 70-57 .46 helix and the 155/222 spring at 8K-9K with a 3.2 track and the QD pulleys from my '14.

aksledjunkie · Mar 10, 2018

Holy crap that is one hell of a helix haha.

FatDogX · Mar 10, 2018

mountainhorse said:
Same as the 800's from 2018/17/16

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So........Same as 16, 17 and 18 ??? I wonder if running the Pro RMK quick drive gears (gear down) will be as big a benefit as we have seen in the 16,17 and 18's ???

Sheetmetalfab · Mar 10, 2018

aksledjunkie said:
Holy crap that is one hell of a helix haha.

It’s on a tied secondary.

szotty · Mar 10, 2018

Wait what secondary is the 850 coming with ?

Sheetmetalfab · Mar 10, 2018

szotty said:
Wait what secondary is the 850 coming with ?

The normal one........
(Not the tied.)

Above i was referring to the steep helix

Norway · Mar 11, 2018

4grams and 2 degrees on the helix sounds like a nice gain from stroking. If the character of the engine can keep the snap of the Axys 800 and add torque from the longer stroke, wow!

carbontj · Mar 13, 2018

I have heard that the clutch taper is larger diameter on the 850...That means only the 850 clutch will work on the 850.

JJ_0909 · Mar 13, 2018

Those really are impressive gains.

xmk1080 · Mar 13, 2018

Those are impressive gains but supposedly the new belt is a harder compound.

richracer1 · Mar 13, 2018

carbontj said:
I have heard that the clutch taper is larger diameter on the 850...That means only the 850 clutch will work on the 850.

This is true.

realbass · Mar 13, 2018

mountainhorse said:
Straight 42 helix (+2˚ from 2018 800 PRO)
.

Let's talking about straight helix change to...? As i understand straight angle of helix is not good for best performance.
Would you reccomend best helix numbers setup?

roni87 · Mar 13, 2018

Altitude

I was thinking axys were stock with 10-64 at 6-8k feet.

mountainhorse · Mar 13, 2018

carbontj said:
I have heard that the clutch taper is larger diameter on the 850...That means only the 850 clutch will work on the 850.

Correct...

But maybe able to have a machine shop ream the taper larger for you on an 32mm clutch.

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CLUTCH SPECS ON THE PRE-PRODUCTION 2019 850 Patriot sleds.

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