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

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Old 12-23-2019, 12:54 PM   #1 (permalink)
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Default 2017 XF 7000 Clutching/RPM's

Bought the sled last year as a left over and put 3100 trouble free miles on it. This year I'm starting to work on getting the performance/clutching dialed in. I put a MBRP trail muffler on and did the airbox mod. To be honest I can't remember what I had for WOT rpm last year but yesterday I gave it a rip and was only getting 8200 on hard pack snow. It pulls like a motha like it did last year so I'm thinking the rpms were probably the same. I've read that the sweet spots for these engines is 8600. What would be the best way to raise the WOT rpm without sacrificing 30-40 mph cruising with the wife? Thanks!!!
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Old 12-24-2019, 07:25 AM   #2 (permalink)
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Torsional conversion on the secondary and adjustable weights for the primary. Tune for a target rpm of right around 9000. I have a 2015 and the gains were very noticeable.
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Old 12-24-2019, 11:11 AM   #3 (permalink)
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Get closer to 9000 RPM's is the magic spot for the 7000.

This dyno sheet is on a Viper same motor, it shows the gains with the different add on options.
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Old 12-24-2019, 11:21 AM   #4 (permalink)
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Here is some good reading back in 2018 a few of us working on the clutching of the 7000. You might find your setup from one of the guys to get close on how much weight to add to your clutching. Some of us where using lighter weights but getting the same results. You will definitely get/feel the results of getting the motor to breath with the intake and muffler.

https://www.hardcoresledder.com/foru...tall-help.html
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Old 01-03-2020, 09:57 AM   #5 (permalink)
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Current Sled(s): 13 XF 1100 N/A, 17 XF 7000
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Location: Bethlehem, NH
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19-20 Mileage: 1050
18-19 Mileage: 3100
17-18 Mileage: 3100
16-17 Mileage: 950
Age: 51
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Went out for a ride with the wife New Years Day and had a chance to compare my sled to her bone stock 2016 ZR7000 137. I haven't had time to mess with the clutching yet but will say the muffler/air box mod DEFINETLY makes a difference! Mine is A LOT more snappy/responsive and pulls harder even at 8200 compared to her 8500. My wife rode mine for a bit and commented how much snappier it is! Still not sure why my sled is lacking 300 rpm compared to hers other than she has 6600 miles and I have 3200. Think I'm going to try the SSI adjustable weights to get the WOT rpms up and go from there.
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Old 01-03-2020, 10:31 AM   #6 (permalink)
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Quote:
Originally Posted by XF:) View Post
Went out for a ride with the wife New Years Day and had a chance to compare my sled to her bone stock 2016 ZR7000 137. I haven't had time to mess with the clutching yet but will say the muffler/air box mod DEFINETLY makes a difference! Mine is A LOT more snappy/responsive and pulls harder even at 8200 compared to her 8500. My wife rode mine for a bit and commented how much snappier it is! Still not sure why my sled is lacking 300 rpm compared to hers other than she has 6600 miles and I have 3200. Think I'm going to try the SSI adjustable weights to get the WOT rpms up and go from there.
Nice to have one that you can compare to.

It is surprising how the add-on's actually work on a four stroke. I would definitely get adjustable cam arms the sled will even run stronger when you get the RPMs to 9000.

If you go with the SSI setup I didn't use there primary spring it engages at a higher RPM so I went with a Pantera primary spring lower engagement, four strokes have great power at lower RPMs. Ask them what engagement there spring engages maybe they lowered it since 2017 when I bought my kit.
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Old 01-03-2020, 01:07 PM   #7 (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 Fun11cat View Post
Nice to have one that you can compare to.

It is surprising how the add-on's actually work on a four stroke. I would definitely get adjustable cam arms the sled will even run stronger when you get the RPMs to 9000.

If you go with the SSI setup I didn't use there primary spring it engages at a higher RPM so I went with a Pantera primary spring lower engagement, four strokes have great power at lower RPMs. Ask them what engagement there spring engages maybe they lowered it since 2017 when I bought my kit.

Was thinking of leaving the stock 35/215 spring alone as I don't want to change engagement/low rpm much. Will let you all know how I make out.
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Old 01-22-2020, 09:39 AM   #8 (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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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!!!
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Old 02-13-2020, 10:50 PM   #9 (permalink)
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Quote:
Originally Posted by XF:) View Post
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!!!
Did you make this change or at least try it out? If so, what were your results?

This post along with some of the others have been real informative. I have a friend with a 2016 ZR 7000 Limited 137". He just picked up some of the adjustable weights from BDX/SSI after I told him all of the positive feedback on here of getting the RPM's up closer to 9K. I'll be helping him in the next couple weeks try to dial it in.
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Old 02-18-2020, 09:33 AM   #10 (permalink)
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Join Date: Apr 2013
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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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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?
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