Hi. My first post here as a rookie HD owner.

About to change oil on my 1980 sporster. I noticed that the oil line from bottom of oil tank leads directly to the oil pump. Do i disconnect hose at inlet to pump to drain oil?

 

Should be a dead-end hose to the frame in back of the primary cover.
Scott

 

There is not, one line directly stright to oil pump.

 

I guess if i fill the hose and let new oil reach pump before starting there should not be any air trapped.
Is it important to disconect the return line and bleed out all the old oil?

 

the fsm is a good thing to have.

 

Yeah, but sadly enough i dont have it😅 I’l just change the oil, think everything will be ok😊