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  #1  
Old 3rd July 2019
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Default Blow by

Was reading on here something about the amount of engine oil you put in after service should be less than stated in the manual to prevent blow by. Can any one tell me in layman's terms what blow by is and what the correct amount of oil use in a 2004 883c.I had a little too much bourbon when I read about it on here and can't remember where I found it. Thanks
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On a new engine, you fill up with the suggested amount in the FSM.
On a used engine, when you drain the oil tank, you still have some oil left in various places (oil lines, pump, filter sump, etc.)
So you can overfill if you simply drain the tank and add what the FSM calls for.
There isn't a 'should be less' stated amount as that may vary per engine.

Blowby pertains to the condition of ring seal at the cylinders / pistons.
Combustion above the piston is pushed past the rings and into the crankcase.
What actually 'blows by' the rings and into the crankcase is a mix of unburnt fuel, water, soot, acids etc.

The blowby you're mentioning I believe is simply from too much oil in the system.
If that equates to too much oil left in the sump, then that's more to get picked up by the wheels as splash and mist.
(changing the oil balance in the engine and setting it up to puke out the air cleaner).

Generally you can add about 1/2 quart less then the recommended amount.
Then..
From the Sportsterpedia:
http://sportsterpedia.com/doku.php/t...g_the_oil_tank
Before topping off the oil tank, run the engine if possible for about a 30 min. ride.
This heats up the oil to operating temperature and suspends the solids in the oil instead of laying on the bottom of the case.
This also allows the oil pump to send most of the oil in the engine back to the tank.
Failure to warm the engine first can result in an overfull condition in the system and you can end up blowing the cap off the oil tank and a big mess.
Filling up your oil tank can also result in the air cleaner breather puking oil also.
The return gears / gerotors in the oil pump are bigger than the feed side so it should clear out most of the sump and back to the tank once running.
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For Rubbermounts..

i always keep the oil near the bottom mark when cold on side stand.. enough oil to lubricate, but none to blowby..

btw. if you put too much oil in, the sporty will spit it out.
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And that's where it starts getting complicated.
You shouldn't have to lower the oil level.
But I understand why.
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2.8 qts, 4oz. in the oil filter and the rest in the oil tank. Should put you a little over the Halfway mark, when warmed up. Same for the 1200's.
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Thanks all again for all your help��
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How can there be ‘too much oil’ in the system? And there isn’t a sump.
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I put enough oil in the tank to get it 3/4 of the way up the dip stick. I have external breathers and never get much of any oil out of it. Internet myths are prevalent in my opinion. If you are having blow by it has little to do with how much oil is in the tank.
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