850 engine

[AkNomad]

I've had 2 friends that own the gen4 850 Summits that have both blown motors (seized) with under 1200 miles on their sleds and both happened with the last 2 days. Is anyone else seeing anything like this, I just find it odd that their engines went with such little miles on them.

 

[maxwell]

I've had 2 friends that own the gen4 850 Summits that have both blown motors (seized) with under 1200 miles on their sleds and both happened with the last 2 days. Is anyone else seeing anything like this, I just find it odd that their engines went with such little miles on them.

pretty strange. Do they warm them up properly? using XPS oil? what elevation? temps?

 

[skegpro]

I've had 2 friends that own the gen4 850 Summits that have both blown motors (seized) with under 1200 miles on their sleds and both happened with the last 2 days. Is anyone else seeing anything like this, I just find it odd that their engines went with such little miles on them.

Did they buy fuel from the same place?

Pull a fuel sample and sent it to a lab to get a octane test completed.

 

[catrutt]

Our group all ride 850's and have had no trouble at all with lots of km. We use xps oil and warm up also use shell fuel.

 

[maxwell]

something i always recommend is warming the sled up until you can feel the rear cooler circulating warm coolant. Warm up Light goes off before the coolant is circulating. Gets a shock of cold coolant if you bomb down the trail right after the warm up light goes off.

 

[Caper11]

This^^^

 

[neilsleder]

something i always recommend is warming the sled up until you can feel the rear cooler circulating warm coolant. Warm up Light goes off before the coolant is circulating. Gets a shock of cold coolant if you bomb down the trail right after the warm up light goes off.

That includes before you drive it off the deck or trailer. Don’t know how many guys I seen start there sled and drive off the deck without any warm up.

 

[FernieHawk]

That includes before you drive it off the deck or trailer. Don’t know how many guys I seen start there sled and drive off the deck without any warm up.

Totally agree...

 

[jpmez69]

That includes before you drive it off the deck or trailer. Don’t know how many guys I seen start there sled and drive off the deck without any warm up.

All the time...

 

[AkNomad]

I haven't talked to them about it but they are usually pretty meticulous when it comes to their sled and they do use XPS and premium gas. My sled doesn't move until the warm up mode is complete and even with that being said, my engine still went but it had close to 3200+ miles on it. (XM 800).

 

[Bnorth]

seen a lot of the early ones go down. 19+ seem much better

 

[Rotax_Kid]

something i always recommend is warming the sled up until you can feel the rear cooler circulating warm coolant. Warm up Light goes off before the coolant is circulating. Gets a shock of cold coolant if you bomb down the trail right after the warm up light goes off.

Real mountain riders don't have time for this. There's fresh pow to slay. Turn your go pro on, start it, get it off the truck/trailer immediately and pin it out of the staging area so you're the first guy up to the shelter. Why would you be concerned about the reliability of something that is taking you 20 miles away from the nearest road?

 

[Couch]

That includes before you drive it off the deck or trailer. Don’t know how many guys I seen start there sled and drive off the deck without any warm up.

Perhaps a bit of an over stretch ....moving off the trailer should not hurt it ...letting it warm up before hammering on it is another story ....

 

[pfi572]

Perhaps a bit of an over stretch ....moving off the trailer should not hurt it ...letting it warm up before hammering on it is another story ....

I don’t think so ? I have my sled engage at 3500 rpm ish which is low compared to the masses .
Reving up a cold sled to 5000 rpm to get it moving still isn’t great .IMO
Cold belt and track will require some RPM .
I always just start mine and grab skies and push off the back of deck while idling .
Cooler needs to be warm before proceeding . IMO

 

[maxwell]

I don’t think so ? I have my sled engage at 3500 rpm ish which is low compared to the masses .
Reving up a cold sled to 5000 rpm to get it moving still isn’t great .IMO
Cold belt and track will require some RPM .
I always just start mine and grab skies and push off the back of deck while idling .
Cooler needs to be warm before proceeding . IMO

fully agree with this statement. clutches and belts are frozen, moisture frozen on the sheaves, some sleds wont move until 5000+ and thats too high of RPM on a cold engine. You are doing damage.

 

[pfi572]

Will add that a elderly fella I have sled with always goes out in the morning from his camp and starts sleds . Wife’s and his .
Goes back in and gets ready while the sleds warm up and beep a couple times and shut down .
All warmed up .
He’s did it for years and has never blown a engine and has put thousands of kms on per season .
He’s slowing down now but at late 70’s he rides more then 90% do . Lol

 

[Caper11]

Sled will come out of warm up at two bars, approx 80f.
Stat doesn’t begin to open and flow coolants to the tunnel, until approximately 104f.

 

[ferniesnow]

So I guess we need a definition of "cold". There is a big difference between 0 C and -20 C. A sled stored inside overnight and thawed/dried and one outside and frozen full of ice. The belt doesn't get warm like the motor nor does the chain case. Have to be moving for everything to get to operating temperature. The belt, chain case, skid/bearings will not warm up sitting still. Common sense prevails and we all know where that has gone in the last little while.

 

[Couch]

So I guess we need a definition of "cold". There is a big difference between 0 C and -20 C. A sled stored inside overnight and thawed/dried and one outside and frozen full of ice. The belt doesn't get warm like the motor nor does the chain case. Have to be moving for everything to get to operating temperature. The belt, chain case, skid/bearings will not warm up sitting still. Common sense prevails and we all know where that has gone in the last little while.

Bingo!

 

[SUPERDUTY]

What year sleds?