Filling Primary with new oil
#11
04-08-2010, 08:04 PM
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I use the royal purple or mobile-1 brand 75-90 gear oil for both my tranny and chain case since the very beginning. I researched a thread on this site of people using gear oil. I don't believe in using the same motor oil in the transmission. Should I change my tactics? I never had any problems with the bike or changing gears since I got it.
#13
04-08-2010, 09:33 PM
The clunk is normal. its the big difference between American and foreign bikes.
American (harley davidson) transmissions have always had a little clunk sound to them especially when dropping down into first. this can vary depending on how warmed up the transmission is.
You can reduce it by using quality oil, but you can't change the transmission so the clunk will never go away.
Proper filling of the primary is to only fill up until you can see the oil hit the lip of the clutch. on my 03 this tends to be 2/3rds quart. over filing can cause clutch slipage
Also, when you can't buy harley or vtwin oil you need to buy the heavy weight oil for a diesel engine. 20-50 is diesel oil i believe. I don't know of anyone running it in there stock cars.
hope that answers your question on the "clunk"
American (harley davidson) transmissions have always had a little clunk sound to them especially when dropping down into first. this can vary depending on how warmed up the transmission is.
You can reduce it by using quality oil, but you can't change the transmission so the clunk will never go away.
Proper filling of the primary is to only fill up until you can see the oil hit the lip of the clutch. on my 03 this tends to be 2/3rds quart. over filing can cause clutch slipage
Also, when you can't buy harley or vtwin oil you need to buy the heavy weight oil for a diesel engine. 20-50 is diesel oil i believe. I don't know of anyone running it in there stock cars.
hope that answers your question on the "clunk"
#14
04-08-2010, 11:35 PM
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#15
04-09-2010, 12:42 AM
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#16
04-09-2010, 06:37 AM
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I bought a 08 Fat Bob first of the year and had the dealer put syn3 in all three holes and it's louder than it was with the harley conventional oil. The transmission clunk is even louder. I'm getting ready to switch all three over to Amsoil 20w 50 so it will be interesting to see what happens. Past experience with Amsoil in my Auto's and atv's has been excellent. One thing I have learned it's all trial and error with what works best.
#18
04-09-2010, 06:57 AM
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Here's a good tutorial on changing the primary oil:
http://www.ehow.com/video_2330188_ch...ary-fluid.html (part 1)
http://www.ehow.com/video_2330189_ad...tml?cp=1&pid=1 (part 2 and primary oil level)
http://www.ehow.com/video_2330188_ch...ary-fluid.html (part 1)
http://www.ehow.com/video_2330189_ad...tml?cp=1&pid=1 (part 2 and primary oil level)
#19
04-09-2010, 08:22 AM
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Couple of questions:
I downloaded a manual I bought off eBay for my '08 FXDWG the other day and it states to fill with 32 ounces of lubricant. Now, I know there are many opinions as to what brand to use. Is this the lubricant choice that some say will help reduce the "clunk" of shifting gears or is it the gear oil choice in the tranny that helps with the dredded clunk?
The manual doesn't say how to check the level also, do you just pour exactly 32 ounces into the hole after you remove the primary cover please?
I used Mobile 1 20W-50 synthetic for the main motor so is this a reasonable choice for the primary also or is ATF better?
I downloaded a manual I bought off eBay for my '08 FXDWG the other day and it states to fill with 32 ounces of lubricant. Now, I know there are many opinions as to what brand to use. Is this the lubricant choice that some say will help reduce the "clunk" of shifting gears or is it the gear oil choice in the tranny that helps with the dredded clunk?
The manual doesn't say how to check the level also, do you just pour exactly 32 ounces into the hole after you remove the primary cover please?
I used Mobile 1 20W-50 synthetic for the main motor so is this a reasonable choice for the primary also or is ATF better?
#20
04-09-2010, 08:32 AM
2008 dyna primary takes 1 quart:
1. drain old oil and reinstall drain plug
2. fill through derby cover hole (there is no inspection cover)
3. use any of the following:
Syn3 20w50
Formula+
Mobil1Vtwin 10w40 or 20w50
Amsoil 10w40 or 20w50
Mobil1 atf
Amsoil atf
Redline MTL (what I use)
4. replace derby cover tighten screws to 100 inch lbs...forget about it.
The thinner the oil the less cold clutch drag but the more primary noise. I use MTL which is a 70w80 trans gear lube with no moly. Pours very thin like a 5w30 oil so very little clutch drag but gives the chain very good lubrication. Lots of guys use Mobil1 ATF as well.
1. drain old oil and reinstall drain plug
2. fill through derby cover hole (there is no inspection cover)
3. use any of the following:
Syn3 20w50
Formula+
Mobil1Vtwin 10w40 or 20w50
Amsoil 10w40 or 20w50
Mobil1 atf
Amsoil atf
Redline MTL (what I use)
4. replace derby cover tighten screws to 100 inch lbs...forget about it.
The thinner the oil the less cold clutch drag but the more primary noise. I use MTL which is a 70w80 trans gear lube with no moly. Pours very thin like a 5w30 oil so very little clutch drag but gives the chain very good lubrication. Lots of guys use Mobil1 ATF as well.
