2017 600 ProS Fuel Mileage & Clutch ?'s - Page 2 - HCS Snowmobile Forums

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Old 03-21-2018, 03:20 PM   #11 (permalink)
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I have a 17 XCR 600 and normally get around 14 mpg riding tight woods trails and open flowing forest roads. My sled does engage around 4000 rpm. I did noticed towards the end of the first first that the sled engaged hard and found the drive belt loose. Could your wife sleds belt just need to be tightened up?
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Old 03-21-2018, 03:31 PM   #12 (permalink)
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I have a 17 XCR 600 and normally get around 14 mpg riding tight woods trails and open flowing forest roads. My sled does engage around 4000 rpm. I did noticed towards the end of the first first that the sled engaged hard and found the drive belt loose. Could your wife sleds belt just need to be tightened up?
I didn't measure the deflection but it did not feel loose by any means. I will check it for sure later today.
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Old 03-21-2018, 03:35 PM   #13 (permalink)
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Sounds like something is wrong with the clutch. My buddy has his 600 wound out when we are riding and even in heavy, wet snow he gets better mileage than that. His 600 is a kitten compared to my 800 as well.
That's what I am worried about but it doesn't act like anything else is wrong and I have not noticed an abnormal belt issues.
nothing is wrong with your sled. My 15 600 SWB engages hi and has pathetic MPG.
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Old 03-21-2018, 03:49 PM   #14 (permalink)
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I didn't measure the deflection but it did not feel loose by any means. I will check it for sure later today.
I usually tighten the deflection so that the track will just baring rotate be itself when on a track stand
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Old 03-21-2018, 05:49 PM   #15 (permalink)
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sounds like somethings sticking a little bit...? I'd pull the clutch cover + spring, put the cover back on and verify that sheaves moves nice & smooth
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Old 03-24-2018, 11:58 AM   #16 (permalink)
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Thanks for the suggestions guys, season is over here at this point so I'm planning on going through everything good over the summer. I'll probably end of changing the secondary spring to help w/ the fuel mileage some.
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Old 02-13-2020, 08:06 AM   #17 (permalink)
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I realize this thread is almost 2 years old but my wifeís 17 600 seems to be harsh/high rpm at engagement also, like 4100-4200, just wondering if you ever resolved your wifeís clutch engagement issues @edgexcsp
Someone suggested a 120-330 primary spring, Iím thinking of trying that, I looked a a red venom spring but i think itís a 140-320 so thatís not going to help with engagement on takeoff.

Thanks in advance!
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Old 02-13-2020, 09:27 AM   #18 (permalink)
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Should be simple to lower engagement rpm.
1. Use a new proper width belt.
2. Set deflection as tight as possible.
3. Make sure both clutches aren't sticking.
4. Then, if necessary, use a lower initial tension spring around 100-120 lbs. Finish tension can stay as stock or slightly higher.
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Old 02-13-2020, 10:35 AM   #19 (permalink)
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Originally Posted by patrioticinnovations View Post
Should be simple to lower engagement rpm.
1. Use a new proper width belt.
2. Set deflection as tight as possible.
3. Make sure both clutches aren't sticking.
4. Then, if necessary, use a lower initial tension spring around 100-120 lbs. Finish tension can stay as stock or slightly higher.
Thank you sir!

Disassembled primary clutch yesterday and cleaned, yes it was dirty so it could have been hanging up, tower tolerance was about .0045 so that might have added to the issues, having clutch balanced and then reassemble and set tower tolerance and belt tolerance, it was about .050, that was ridiculous!
I put my calipers on the belt, 1.46, not that It really matters, my wife is 65 and doesnít do a lot of hot rodden like she used to, really no abuse to the belt whatsoever on her part, I know thereís other factors involved on belt ware. Checking clutch Alinment and such, just wondering if edgexcsp ever resolved his/her issues.

Thanks for the advice patrioticinnovations I appreciate it!
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Old 02-14-2020, 02:37 AM   #20 (permalink)
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Originally Posted by jdw1 View Post
I realize this thread is almost 2 years old but my wife’s 17 600 seems to be harsh/high rpm at engagement also, like 4100-4200, just wondering if you ever resolved your wife’s clutch engagement issues @edgexcsp
Someone suggested a 120-330 primary spring, I’m thinking of trying that, I looked a a red venom spring but i think it’s a 140-320 so that’s not going to help with engagement on takeoff.

Thanks in advance!
Put in a venom yellow 120/340 primary spring. In the secondary put in a 140/220 black/green, along with 3 delrin washers. One on each end of the spring, one under the spring cup.

The lower engagement spring will make it engage softer, and the different secondary spring will lower cruise rpm and improve mileage and acceleration.
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