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

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Old 03-21-2018, 10:01 AM   #1 (permalink)
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Default 2017 600 ProS Fuel Mileage & Clutch ?'s

Looking for a little advice on the wife's 600 ProS Switchback. I thought I saw a similar topic before but it didn't turn up in my search so I apologize if this is a rehash.

We picked up a leftover 2017 Switchback ProS 600 back in December and it has around 700 miles on it at this point, so I know that we are past the break in phase. She loves the sled and I am coming around to the way it looks but I'm not very impressed w/ the clutch engagement or fuel mileage...

The primary seems to engage super stiff compared to my 800 Assault. It catches me off guard when moving it around and it tends to spin the track at every engagement which is bad combination in the deeper snow or our stone driveway when loading. I'm thinking that a spring changed is all I need but I'm not exactly a clutching guru...

I know that the ProXC skid is not as efficient but compared to my 2017 800 Assault the fuel mileage of the ProS is dismal on most days. Our last ride was mostly a groomed trail trek at "wife speeds" and ProS only got 8.5 mpg, I got over 12 w/ 800. I don't care about the cost of fuel but I would like the sled to at least get a 100 to 120 miles to a tank of fuel... What are you guys doing to make that happen?

Thanks!
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Old 03-21-2018, 12:42 PM   #2 (permalink)
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I have a 2016 600 Switchback, Ripsaw II track. My normal gas mileage is 14 and so is by friends who has the same sled. If you switch sleds does it still get the same poor mileage? Spring change in the primary I recommend 120/320
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Old 03-21-2018, 12:51 PM   #3 (permalink)
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Current Sled(s): 2020 SBA 850
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Location: Finger Lakes, NY
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I have a 2016 600 Switchback, Ripsaw II track. My normal gas mileage is 14 and so is by friends who has the same sled. If you switch sleds does it still get the same poor mileage? Spring change in the primary I recommend 120/320
I've only ridden it once to get the first break in miles put on the engine. The fuel gauge is not as accurate as my Assault so I had been really concerned until I fueled up after the ride I mentioned. Just a hair over 10 gallons for an 85 mile ride really shocked me. It was mostly all fresh groomed trail and we were moving along steady but she if far from an aggressive rider, she is a good rider but not a hammer down from every stop type.

We are losing snow fast so I doubt I will get a chance to ride the sled much before the end of the season. I was looking for off season/next season suggestions.
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Old 03-21-2018, 01:06 PM   #4 (permalink)
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600 got a 140 initial rate spring , but shouldn't be harsh at engagement. You could try backing down to a 120

secondary spring in these are very stiff, which hurts mileage - 160-240. Its recommended to put in e.g a 140-220 instead.

I put a softer spring in mine, got better but still not stellar mileage
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Old 03-21-2018, 01:29 PM   #5 (permalink)
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I picked up about 3 mpg going to the 140-220 secondary spring and it still pulls 8300-8350 most of the time. Going to try a 140-200 next, before I throw some weight at it.
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Old 03-21-2018, 01:47 PM   #6 (permalink)
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Location: Finger Lakes, NY
Favorite Riding Area: Off the beaten path
19-20 Mileage: 804
18-19 Mileage: 1380.9
17-18 Mileage: 1481
16-17 Mileage: 1152
Riding Since: 1990
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Originally Posted by ivar View Post
600 got a 140 initial rate spring , but shouldn't be harsh at engagement. You could try backing down to a 120

secondary spring in these are very stiff, which hurts mileage - 160-240. Its recommended to put in e.g a 140-220 instead.

I put a softer spring in mine, got better but still not stellar mileage
It engages harder than my 800 no matter how you work the throttle. In soft snow or the stones it will spin w/ out any throttle. The stones I can rake but in deep snow it puts her at a disadvantage when taking off. I think I will try the secondary spring first and see what happens... I'm not looking for stellar mileage just enough to keep up w/ my 800...
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Old 03-21-2018, 02:12 PM   #7 (permalink)
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did you notice at what rpm it engages ? I think mine is right above 4k iirc.
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Old 03-21-2018, 02:28 PM   #8 (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.
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Old 03-21-2018, 03:02 PM   #9 (permalink)
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Previous Sled(s): 19 Indy XC,17 SBA,17 ProS 600 SB, 14 SBA 800, 09 D8,03 500
Location: Finger Lakes, NY
Favorite Riding Area: Off the beaten path
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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.
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Old 03-21-2018, 03:04 PM   #10 (permalink)
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Previous Sled(s): 19 Indy XC,17 SBA,17 ProS 600 SB, 14 SBA 800, 09 D8,03 500
Location: Finger Lakes, NY
Favorite Riding Area: Off the beaten path
19-20 Mileage: 804
18-19 Mileage: 1380.9
17-18 Mileage: 1481
16-17 Mileage: 1152
Riding Since: 1990
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did you notice at what rpm it engages ? I think mine is right above 4k iirc.
Right around 4000 rpm, I will have to fire it up and check for sure. It doesn't seem to engage high, just stiff if that makes sense, almost like a button clutch or an old Cat clutch, not smooth like Polaris clutching.
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