What causes this?

[diamonddave]

And why would it return if it was removed at the beginning of the season?

Does this cause a reduction in the volume of oil going into the motor?

Would this concern you?

2013 Pro-RMK with approximately 600 miles. Reported Fuel to oil ratio over the last 3 rides was 64:1. No oil cap or vent changes.

Oil pump rod has been turned up by the looks of it.

This is difficult to see unless you remove the oil tank and pull back on the black protective coating surrounding the oil line.

 

[bryceraisanen]

Sled upside down? Long wheelies?

 

[joshkoltes]

I would get the air out by pulling the hose clamp pulling the hose loose and hold the hose under the now drizzling oil from the barbed fitting as to catch it in the hose until no more air is preasant while quickly pushing the hose back on.
Or at least that's what I've done

 

[PaasoRacing]

I have found the air bubble will re-appear regardless of what you do. That is a rather large air bubble... but small ones will appear even when the tank is properly vented. I run two of my vents(one in the cap, one in the tank) on my XC race sled and have found air bubbles will still show up. Eventually I learned to ignore the bubbles, as my oil use was consistent and more than enough.

 

[rmkboxer]

I had noticed on mine after every ride it would have a air bubble, I was trying to run it down to switch oils, I switched oil caps and I have not had a problem, I used a oil cap off of one of my other sleds that I knew was good, you can see if the cap is working but you have to hold it up and down like it sits on the oil tank

 

[sierraclimber]

Had the same thing and I was concerned about it too, even though I rode it for a long time that way. ha! The oil seamed to go around the bubble. I ended up laying the sled over on its side overnight to get rid of it. Try that first.

 

[PaasoRacing]

Had the same thing and I was concerned about it too, even though I rode it for a long time that way. ha! The oil seamed to go around the bubble. I ended up laying the sled over on its side overnight to get rid of it. Try that first.

I used to set them up overnight on their sides to get the bubble out too. I don't even bother now.

 

[kanedog]

I tipped my sled on its side also. The air bubble drove me nuts and while laying awake at night, thinking about wrenching on my sled, I thought that the air bubble was too small to push its way horizontally then vertically through the thick oil.
I don't know if that is the reason but I did rid get of it by tippage.

 

[diamonddave]

Is this tipping the sled on it's side to remove an oil line air bubble in the Owner's manual? I'm wondering if I missed that?

Does Polaris sell a special stand to store your sled on it's side just for this specific purpose?

So we have ways to remove it. My question is what causes this and is it causing a reduction in the volume of oil to the oil pump?

We've been seeing this since the IQ chassis.

 

[Texasron]

Reverse maybe? Turning oil pump opposite direction.

Drill/vent oil cap? Did you do that? Turn oil pump backwards by using reverse/