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Rubber Mount Sportster Motorcycle Talk (2004-2006) This area is to discuss issues, problems and anything else unique to the 2004 and above Sportster motorcycles

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View Poll Results: Does your Rubbermount use too much oil (more than 1 QT. per 1,000 miles)
04- NO 202 20.89%
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  #231  
Old 9th September 2020
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Quote:
Originally Posted by glbsportster View Post
I have yet to hear about a pump that can put out more oil than it takes in
Please read this link in the Sportsterpedia. It explains what you are asking:
Wet Sumping

If you are not dripping oil, that's great.
But it isn't because of an EBS (don't know where that term came from).
It's because your crankcase pressure is stabilized.
You can remove your EBS and revert to new OEM parts and you won't leak.
You can keep the EBS and remove the breather valve(s) and your EBS will now leak.

Quote:
Originally Posted by boomerguy View Post
This information came from the S&S Cycles website and U-tube videos. Check them out.
86-up factory Sportster engines all feed oil from the pump to the filter into the engine to the pump and back to the tank.
S&S engines are different animals of the same mother.
They have their own design based off earlier Sportster engines.
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Reference the XLFORUM'S Sportsterpedia for additional technical information & advice

In Search of Fuel, Sunshine and a Steady Idle.
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  #232  
Old 9th September 2020
boomerguy boomerguy is offline
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Quote:
Originally Posted by Hippysmack View Post
86-up factory Sportster engines all feed oil from the pump to the filter into the engine to the pump and back to the tank.
S&S engines are different animals of the same mother.
They have their own design based off earlier Sportster engines.
I still learn something new from this forum every day. This is good info and obviously, I ASSUMED that the S&S engines were based on current EVO engines. Thanks for the correction and update.

Now, my next question since we're on the subject of oil filter vs oil pump location, does it matter if the oil filter on the rubbermount Sportsters has an anti-drainback valve?
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  #233  
Old 9th September 2020
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No, there is no need.
But thank you. I need to add this to the pedia.
The oil tank sits higher than the oil filter housing.
So if any oil did drain back. Where could it drain to?
We all know Sportsters have a problem with oil gravity draining into the engine when the engine is shut off and it sits for a while.
This is due to either a worn check valve or worn clearances in the oil pump.
So, oil will be pushed against the filter at all times without a drainback valve in the filter.
No need for the drainback valve.

edit:
I massaged my post into the anti-drainback portion of this page in the pedia.
http://sportsterpedia.com/doku.php/t...rainback_valve

Thanks again.

Last edited by Hippysmack; 9th September 2020 at 03:57..
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