998 cooling system problems - HCS Snowmobile Forums

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Old 02-20-2018, 06:56 PM   #1 (permalink)
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Default 998 cooling system problems

We're seeing a number of problems with the cooling system on the 998, but I wanted to see if it isolated to my customers or a more widespread issue.
So please, if you've had problems, what were they and what conditions were you in at the time?

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Old 02-20-2018, 07:39 PM   #2 (permalink)
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The only time mine gets warm is with lack of snow or idling around. Good idea if their on the warm side to re start them after 30 secs of sitting .
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Old 02-20-2018, 07:55 PM   #3 (permalink)
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Yeah i noticed the same.. almost need a rad and fan for ridding at lower speeds, low snow or idling
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Old 02-20-2018, 07:58 PM   #4 (permalink)
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Ive never seen mine heat up at all except for when idling. Lots of long road stretches too.
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Old 02-20-2018, 08:08 PM   #5 (permalink)
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When running slow 20-30 mph with good snow temps at 185-190 our trails are narrow, hard pack same.
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Old 02-20-2018, 08:33 PM   #6 (permalink)
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Tom,
I've seen times where the machine heats up due to snow not being caught by the flap. Lower the ride height just a bit and temps drop right down.

I think I'm going to add a rubber flap extension for next season on mine. Another 3-4" would do wonders.

Heard scratchers help a lot too in certain conditions also.
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Old 02-20-2018, 08:57 PM   #7 (permalink)
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I'm working on some cooling system modifications right now. Just trying to see if they will be something small for myself or if it's something I'll bring to market.
There are some serious design flaws in this sled/engine combo that I want to address and the cooling system is one of them.

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Old 02-20-2018, 10:51 PM   #8 (permalink)
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I had mine heat up for the first time this weekend, hard trails and slow going, plus waiting longer for slow riders at corners, my temp usually runs 168 at the highest and this weekend it was 180-190 and temp light flashed and sled cut out.
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Old 02-20-2018, 10:55 PM   #9 (permalink)
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I've almost never seen anything outside of 168-174 degrees while riding. If left to idle it will get hot.
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Old 02-21-2018, 06:53 AM   #10 (permalink)
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I was having an issue them spent time bleeding the system and that helped some. My biggest upgrade was adding studs and that helped keep the temp more consistent. I had issues on low snow or extremely cold days with hard set up snow.
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