Purging the old oil
#11
I've been riding for over 50 years and only recently learned I was missing out on something! No it isn't necessary. Even if we were to purge what oil can be got out, there will still be some trapped around the engine/trans/primary. Check the FSM and see the numbers for dry and wet fills - the difference between them is the oil we cannot get out without stripping and cleaning. So purging is futile IMHO!
#12
#13
#14
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HeritageHippie (03-09-2024)
#15
#16
Disassemble one of these engines and see how much oil is in the crankcases, a few ounces, and maybe a few ounces in the oil lines.
An insignificant amount.
Purging the oil is a waste of oil and time.
Last edited by Dan89FLSTC; 06-22-2018 at 01:44 PM.
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Blk/Wht/andChrome (08-05-2023),
M Oclaf (08-02-2023)
#17
Would you pour a pint of beer into a glass with 7oz of week old beer at the bottom? If you would then that would explain it.
#18
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Just watch the video, or this one instead, a whole quart of filthy black old oil.
https://www.youtube.com/watch?v=57WUxIeKPGM&t=263s
Would you pour a pint of beer into a glass with 7oz of week old beer at the bottom? If you would then that would explain it.
https://www.youtube.com/watch?v=57WUxIeKPGM&t=263s
Would you pour a pint of beer into a glass with 7oz of week old beer at the bottom? If you would then that would explain it.
The reason you are getting a quart out is because of the new oil mixing with the old until it runs clear.
You can scavenge/purge the oil if it makes you happy or you can leave the old in to mix with the new.
I know of some bikes with more than 100k on them that have never been purged so I don't think it's as big a deal as you are trying to make it out to be.
#19
FWIW your motor keeps around 16 oz of oil in it when you change the oil.
The reason you are getting a quart out is because of the new oil mixing with the old until it runs clear.
You can scavenge/purge the oil if it makes you happy or you can leave the old in to mix with the new.
I know of some bikes with more than 100k on them that have never been purged so I don't think it's as big a deal as you are trying to make it out to be.
The reason you are getting a quart out is because of the new oil mixing with the old until it runs clear.
You can scavenge/purge the oil if it makes you happy or you can leave the old in to mix with the new.
I know of some bikes with more than 100k on them that have never been purged so I don't think it's as big a deal as you are trying to make it out to be.
When you change the oil in your car, do you go ahead and put 1 quart of the old oil back into the engine to save oil?
A motorcycle engine is no different, in fact much more critical due to higher temps and a wet clutch.
#20
I purge on my EVO, mainly because it's easy, takes all of 1 minute extra time and no mess with the filter under the bike, so why not.
Now with the filter under the bike, the lines to and from the 10 row oil filter, I get about 3/4 a quart of dirty oil out, very little mixing, it changes color abruptly,
also makes me feel warm and fuzzy, and my beer taste better.
Now, do I do it on my other two bikes, hell no, I get pissed at the mess it makes just changing the oil filter with it's dumbass location, not as much oil left in the system as the EVO, and they're not on the return side.
Now with the filter under the bike, the lines to and from the 10 row oil filter, I get about 3/4 a quart of dirty oil out, very little mixing, it changes color abruptly,
also makes me feel warm and fuzzy, and my beer taste better.
Now, do I do it on my other two bikes, hell no, I get pissed at the mess it makes just changing the oil filter with it's dumbass location, not as much oil left in the system as the EVO, and they're not on the return side.