primary fluid question..
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Cruiser
Joined: Nov 2007
Posts: 102
Likes: 0
From: dayton, ohio
put 32oz of screamming eagle syn3 in.adjusted everything and all seems ok,just gotta reassure myself i did it correctly. will ride a few miles and recheck. thinkin maybe i did have a cable hang up and maybe the clutch was a lil loose read the trick on how to adjust the clutch and gonna do it in the next few days(always wondered if my seat of the pants fill was the right thing)seems more logicial when i read the thread on how to do it. that way at least there is a guide line....thankx to all
Road Warrior
Joined: Jul 2009
Posts: 1,979
Likes: 2
From: Northern Colorado
The problem I have with the manual is that it only recommends Formual+ or SYN3 in the tranny and primary. Gear oil works better in both of those (IMO) so I will not use SYN3 and I can't get a straight answer as to what exactly Formula+ is, I'm not a big fan of magical mystery oil. The way I see it, in order for Formula+ to be compatable in the primary it can't be any heavier than a 90w gear oil (IF it is a gear oil) which in my opinion is a little too light for the tranny. And yes, I do realize Harley-Davidson transmissions are designed and tested using Formula+ but I'm still not sold on that stuff.
Last edited by NoCoLoco; Oct 22, 2009 at 09:57 PM.
Ultimate HDF Member
Joined: Aug 2008
Posts: 5,413
Likes: 17
From: eastern oklahoma
do not use 75/90 or any other gear oil in your primary. regular 20-50 dino oil will work just fine, and i've heard of many using atf, although i've not used it in the primary. i have been using royal purple 20-50 max cycle also, but i do believe it is allowing the clutch to not have as much grab as the dino 20-50. the heavy weight 75-90 is only for use in the trans, not the primary. i use 75-140 royal purple in my trans, and it shifts sweet, is not noisy at all. great stuff, but only for the trans, not for the primary.
Stellar HDF Member
Joined: Feb 2008
Posts: 2,336
Likes: 415
From: Southern Maryland
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Intermediate
Joined: Apr 2007
Posts: 37
Likes: 0
Most new cars and trucks have ATF fluild in manual trans. Also race bikes use atf fluid alot of times its made for clutches. In my 07 ultra classic ATF syn worked better than mobil 1 syn had a little slippage with mobil 1, but i use mobil 1 in the other 2 holes
Last edited by JRSULTRA07; Oct 23, 2009 at 05:32 AM.
