Air Bubble in Oil Line at Tank Outlet

[jrs591]

Need some info from owners who have had this.
14 Assault RMK
Keep getting a 12 to 15mm long bubble right at tank outlet on main injection line.
It's using roughly 50 or 55:1 (VES synthetic) all the time when I check fuel to oil used.
I have gotten the air bubble out at oil tank outlet a few times. 1x by bleeding and 1x by removing line at tank and filling line, its messy but works. I thought I had resolved it both times.
Every time I ride it keeps coming back.
My vent in cap is working as the ball is loose and knocks the vent spicket, and I put another cap on from my shift. Same results.
I never checked my 12 maybe it did this all the time and I never knew it. I happened to look a few weeks ago when I had my hood off and noticed it. Now it's driving me nuts? Any suggestions or recommendations. Thanks.

 

[diamonddave]

I had this happen on Dragon. Oil bubble would return no matter what I did.

I finally modified the vent in the oil cap. Installed an external vent. Problem solved.

The vents in these caps do not open often enough.

 

[skibreeze]

What's your dealer say? A small bubble is fairly common, yours seems excessive.

 

[tuneman]

The engineers at Polaris were on something when they designed that vented cap. Horrible design. Get the Paaso Racing vented cap or separate vent line. I installed Paaso's seperate vent line just last night: