Primary fluid

[COOPer]

What is everybody running in primary? Ive read ATF , motor oil and primary fluid. My owners manuel doesnt say

 

[awg]

I put Mobile 20-50 in all 3 holes. Some don't recommend it though.

 

[Mickeetwo]

I run Bel-Ray primary fluid in mine

 

[HMAN]

ATF type F. Cant be just any ole atf. Gotta be the type F

 

[john sachs]

Every bike I change primary oil in gets ATF type F. No magic expensive type ATF, or any solve problem type oil. but cheap ATF oil.
John

 

[SKOGDOG]

I’m with John—I think both of us were raised by depression-era parents and tend to be thrifty…
Type F—the only thing you need to do is to lube the primary chain, so ATF type F is a less expensive option.
And I’m sure a very high grade synthetic might contribute to clutch slippage, so lube for the primary chain Is a straightforward issue.

 

[Mickmorris]

I use Lucas (non synthetic) chain oil. I think you will just have to pick what you think is best for your BigDog. That’s part of the fun of working on them.

 

[bdm7250]

Primary fluid??

 

[Jwooky]

I prefer ATF, inexpensive and contains friction modifiers.

As others said, pretty much anything but synthetic. A little to slippery for the over task clutches.

 

[COOPer]

Yeah my first Dog and first doing other than maintenance on a bike. Not bad to work on, i put new forks on last week

 

[Sven]

Just want to mention... different bike, but I more mix my oils so I added syn and yes, the clutch slipped. Waited a few hundred miles and no more slip. The point? I'd rather save the hard parts with syn, or have them last longer, sacrifice the plates for a few hun before I get on it for that occasional yee-haa that only happens a few seconds before I run out of road.