2017 XF 7000 Clutching/RPM's - Page 2 - HCS Snowmobile Forums

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Old 02-18-2020, 06:11 PM   #11 (permalink)
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I would think the springs are different because the clutches are different. Yamaha from what I understand, does not share the same primary and secondary as Arctic Cat
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Nothing sounds like a 1049cc 4 stroke
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Old 02-18-2020, 07:04 PM   #12 (permalink)
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I put the BDX/SSI secondary clutch kit in my 14 7000 the same time I made my other changes so I'm not sure how much of a difference it was.
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Old 02-18-2020, 07:44 PM   #13 (permalink)
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I’m going to try moving my hole 2 second weight in my adjustable primary weights from hole 2 to hole 1 so I’ll have 2 weights in hole 1 and 1 weight in hole two with no weights in hole 3 and 4.
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Old 02-19-2020, 10:36 PM   #14 (permalink)
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I'm currently trying out some Heavy Hitters in my 16 129". Stock clutching is so heavily loaded. Has terrible backshift. They are deceptively quick with stock clutching but no fun to ride.

Have. a Dalton 175-240 secondary and some various primary springs to try. Nothing available that is close the the 35 lb stock initial rate so engagement will be going up. Should be able to offset that a hit since I'll be loading up the heel and middle pretty aggressively..

Hopefully going up next week to test.
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Old 02-19-2020, 10:47 PM   #15 (permalink)
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Another update on my tuning... Come to find out I had a 140/230 secondary spring. Ordered a Venom 155/240 and delrin washer to help the backshift. Finally got to try it out yesterday and it made it worse. WOT rpms are 8700 and going up hills rpm falls to 8500. I would've thought the stiffer secondary spring would've brought my rpms up? Anyone have any experience with Venom springs? Are they rated different that Cat?
Ususally all aftermarkets give the rate figures at the same installed rate as stock so it should be a accurate comparison.

A few possible things that happened

Conditions. Will massively affect clutching on the factory secondary setup. Mine ll stock would run 96-97 mph on a hardpack road but might see 85 down a trail.

Belt deflection. If it wasn't exactly the same it could gave lowered your rpm.

Belt slippage. Possible but highly unlikely was your were slipping the belt in the secondary with the stock spring and the Venom with a bit higher tension grabbed the belt better reducing the rpm.

I'm going to guess conditions were the main factor. I have a 175 245 Dalton I'll be trying out. The large spread of the factory helix contributes to the poor backshift and inability to hold rpm in changing conditons.

The 1049 engine has a wide powerband and a ton of torque. They should be almost 2 stroke like in their responsiveness when clutched correctly
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Old 02-20-2020, 07:45 AM   #16 (permalink)
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Torsional conversion will greatly improve backshifting.
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Old 03-26-2020, 12:53 AM   #17 (permalink)
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So here's where I'm at with my tuning... Installed the SSI adjustable weights and left the 35/215 spring in. First added 1 weight each in holes 1,2, and 3 for a total weight of 59.2 grams. Mid range pulled better and rpm was 8650. Improvement but I wanted more rpm! I moved the weight from hole 3 to hole 2 for a result of 1 weight in hole 1 and 2 weights in hole 2 with the 35/215 spring. HOLY CRAP what a difference! On flat groomed trails it pulls like my 07 800 did and saw 8850-8900 rpm. LOVE IT!!! Took it for 40 mile ride on groomed trails and coming out of a corner going up a fairly steep hill my WOT rpm fell to 8650 from 8850. Did some reading and found adding a stiffer secondary spring will help back shift under serious load (going up hills). According to the Country Cat OEM parts manual I have a 155/220 secondary spring. Think going to a 155/240 would make a difference maintaining 8850-8900 rpms going up hills? Thanks for the help guys! VERY HAPPY with the changes I've made so far!!!
I ended up buying some SSI weights to try. Are you running stock secodary helix?

I used stock 35-215 primary with a couple spring shims. Used 2,0,1,3 for magnets but I swapped to a 50-44 helix with a 175-245 spring. Much more consistent upshift and backshift with that secodary setup. Runs 103 on hardpacked road and mid 90s on the trail. Big improvement over stock.
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Old 03-30-2020, 12:28 PM   #18 (permalink)
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I ended up buying some SSI weights to try. Are you running stock secodary helix?

I used stock 35-215 primary with a couple spring shims. Used 2,0,1,3 for magnets but I swapped to a 50-44 helix with a 175-245 spring. Much more consistent upshift and backshift with that secodary setup. Runs 103 on hardpacked road and mid 90s on the trail. Big improvement over stock.

I'm still running stock secondary helix... Was planning on changing that next from a stock 54-49 to a 54-46 but ran out of time as they closed the trails due to the coronavirus bull shit!!! Oh well next year I'll have a good place to start!


I did find out according to the parts catalog the Crosstrek is supposed to have a different clutch setup from what I have. Mine came with the same clutch setup as my wifes ZR7000. According to the parts catalog I should have a straight 46 helix...
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Old 03-30-2020, 09:12 PM   #19 (permalink)
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I'm still running stock secondary helix... Was planning on changing that next from a stock 54-49 to a 54-46 but ran out of time as they closed the trails due to the coronavirus bull shit!!! Oh well next year I'll have a good place to start!


I did find out according to the parts catalog the Crosstrek is supposed to have a different clutch setup from what I have. Mine came with the same clutch setup as my wifes ZR7000. According to the parts catalog I should have a straight 46 helix...
My 16 stock setup

Primary Spring 35-215
Weight 64 gram

Sec Helix 58-49
Spring 140-230

Yours is a XF?
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Old Today, 09:23 AM   #20 (permalink)
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Current Sled(s): 13 XF 1100 N/A, 17 XF 7000
Previous Sled(s): 07 XF 800, 04 Sabercat 600 EXT
Location: Bethlehem, NH
Favorite Riding Area: Great North Woods, The County
19-20 Mileage: 1050
18-19 Mileage: 3100
17-18 Mileage: 3100
16-17 Mileage: 950
Age: 51
Riding Since: 1980
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Quote:
Originally Posted by Sre1000 View Post
My 16 stock setup

Primary Spring 35-215
Weight 64 gram

Sec Helix 58-49
Spring 140-230

Yours is a XF?

Mine is a Crosstrek (XF) and I have/had the same stock setup as you. Is yours a XF?


I do have the 58-49 helix I typo'd when I wrote 54-49. I do plan on going to a 56-46 for next year and trying it. Venom will custom grind helix's for $110.
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