Milwaukee Eight (M8) 2017 and up M8 Air and Liquid Cooled discussion
Sponsored by:
Sponsored by:

Primary transfer

Thread Tools
 
Search this Thread
 
Old Apr 10, 2020 | 09:28 AM
  #1  
Camarosx2's Avatar
Camarosx2
Thread Starter
|
Cruiser
Joined: Mar 2017
Posts: 248
Likes: 187
From: Central mass
Default Primary transfer

Does anyone else have a 2020 or older model, with the primary vent, that is still transferring? My 2020 road glide seemed to have an over filled primary when I did the 1k service but I didn’t measure the fluids. Now I have 4400 miles and I’ve had to top off the trans twice and I also drained 12 ounces from the primary, currently have redline in trans and hd primary fluid In primary, which has turned pinkish red. I called the dealer but I can’t bring my bike in for service because it’s my only transportation till I buy a car in a few months, they don’t offer loaner bikes and I can’t afford a rental with this virus crap. so for now I’m gonna run formula+ in both holes. Has anyone else had this issue with the vent installed and was there a solution that fixed it.
 
Reply
Old Apr 10, 2020 | 10:15 AM
  #2  
mjwebb's Avatar
mjwebb
Seasoned HDF Member
15 Year Member
Photogenic
Community Builder
Top Answer: 1
Joined: Jan 2008
Posts: 13,653
Likes: 11,421
From: State of Confusion
Default

Originally Posted by Camarosx2
Does anyone else have a 2020 or older model, with the primary vent, that is still transferring? My 2020 road glide seemed to have an over filled primary when I did the 1k service but I didn’t measure the fluids. Now I have 4400 miles and I’ve had to top off the trans twice and I also drained 12 ounces from the primary, currently have redline in trans and hd primary fluid In primary, which has turned pinkish red. I called the dealer but I can’t bring my bike in for service because it’s my only transportation till I buy a car in a few months, they don’t offer loaner bikes and I can’t afford a rental with this virus crap. so for now I’m gonna run formula+ in both holes. Has anyone else had this issue with the vent installed and was there a solution that fixed it.
think you're the first person I heard of since primary vent installed that is reporting a fluid transfer problem, with tons of owners reporting primary vent solved their problem,...my 2020 RGS with 6000 miles is perfect
 
Reply
Old Apr 10, 2020 | 10:47 AM
  #3  
702's Avatar
702
Seasoned HDF Member
Joined: May 2018
Posts: 5,814
Likes: 7,145
From: Las Vegas
Default

Is there any chance that your bike came without the vent? If you have the vent and it's transferring, damn.
 
Reply
Old Apr 10, 2020 | 11:05 AM
  #4  
wildandfree's Avatar
wildandfree
Tourer
5 Year Member
Liked
Loved
Community Favorite
Joined: Jun 2017
Posts: 285
Likes: 282
From: Prescott, AZ
Default

My 2017 FLHXSE continued to xfer after I installed the vent, but only in super hot temperatures (it gets hotter than Hell in the Arizona desert). However, after I dumped the SYN-3 and started putting the H-D Gear Oil in both the tranny and the primary, oil transfer stopped completely. Go figure.
 
Reply
Old Apr 10, 2020 | 11:09 AM
  #5  
mjwebb's Avatar
mjwebb
Seasoned HDF Member
15 Year Member
Photogenic
Community Builder
Top Answer: 1
Joined: Jan 2008
Posts: 13,653
Likes: 11,421
From: State of Confusion
Default

Originally Posted by wildandfree
My 2017 FLHXSE continued to xfer after I installed the vent, but only in super hot temperatures (it gets hotter than Hell in the Arizona desert). However, after I dumped the SYN-3 and started putting the H-D Gear Oil in both the tranny and the primary, oil transfer stopped completely. Go figure.
what change in clutch and shifting behavior have you observed since going with their 80W140..just curious....I'll stick with Formula+ as always on mine but might consider the 80W140 HD synthetic for wife's CVO Tri Glide instead of the SYN3..thanks
 
Reply
Old Apr 10, 2020 | 11:23 AM
  #6  
KrustyKush's Avatar
KrustyKush
Road Master
Joined: Jan 2016
Posts: 1,143
Likes: 433
From: Menifee, CA
Default

I replaced the Syn3 in my primary a few weeks ago, when I replaced my clutch pack, with the new HD Gear Oil. So far, I've still got the Syn3 in the tranny, but I aim to replace that with the HD gear oil pretty soon.

The only difference I can detect is the absence of a "plinking" sound. I had been hearing this sound during deceleration as I work the gear box down shift. Most noticeable just as I come to a stop, probably during moments with clutch pulled. I was starting to wonder whether this noise was caused by a worn set of clutch plates, and was curious if replacing the plates, which I'd already planned to do, would eliminate the plinking noises. Now, the plinking sounds are gone. Since I changed the clutch plates with new oem (10-plate) and replaced the Syn3 in the primary at the same time, I'm not sure whether the noise reduction was caused by the new plates, or the heavier oil. Maybe a bit of both?
 
Reply
Old Apr 10, 2020 | 11:26 AM
  #7  
TriGeezer's Avatar
TriGeezer
Seasoned HDF Member
Photogenic
Photoriffic
Shutterbug
Joined: May 2012
Posts: 32,934
Likes: 36,031
From: Carlsbad, CA
Default

Damn Camaro, that certainly sounds like transfer. 1st time it’s been reported on the forum with the vent kit. Check to make sure the vent was installed, and report back. There should be a rubber tube coming out of the back of the outer primary/cover at about 2:00.
 
Reply
Old Apr 10, 2020 | 11:27 AM
  #8  
wildandfree's Avatar
wildandfree
Tourer
5 Year Member
Liked
Loved
Community Favorite
Joined: Jun 2017
Posts: 285
Likes: 282
From: Prescott, AZ
Default

Originally Posted by mjwebb
what change in clutch and shifting behavior have you observed since going with their 80W140..just curious....I'll stick with Formula+ as always on mine but might consider the 80W140 HD synthetic for wife's CVO Tri Glide instead of the SYN3..thanks
It helped a little, but not enough. Coming off of a different "twin" brand, I've never been comfortable with H-D's "thunk" shifting from neutral to first (simply can't be good for the drivetrain). The change to H-D's gear oil helped this a little. I later learned that by double-clutching before shifting into 1st pretty much made the "thunk" go away.

I recently installed the Baker compensator sprocket and a Rekluse clutch (see https://www.hdforums.com/forum/milwa...questions.html). I'm not sure which component made the biggest difference, but the "thunk" is nearly gone. I'm still not happy and will be installing the Bakersmooth-shift kit next.
 
Reply
HD Forum Stories

The Best of Harley-Davidson for Lifelong Riders

story-0

7 Times Harley-Davidson Chucked Tradition Out the Window

 Verdad Gallardo
story-1

7 Surprising Harley-Davidson Products that Are Not Motorcycles

 Verdad Gallardo
story-2

8 Best Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-3

10 Worst Harley-Davidson Motorcycles Ever

 Pouria Savadkouei
story-4

Killer Custom's Jail Break Is The Breakout That Refused to Blend In

 Verdad Gallardo
story-5

Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

 Verdad Gallardo
story-6

Harley-Davidson Reveals Super Cool Cafe Racer Concept

 Verdad Gallardo
story-7

Engraved Rebellion: Inside Bundnerbike's Glam Rock II

 Verdad Gallardo
story-8

10 Motorcycles You Should Never Buy

 Joe Kucinski
story-9

10 Things Harley-Davidson Needs to Fix in 2026

 Verdad Gallardo
Old Apr 10, 2020 | 11:28 AM
  #9  
mjwebb's Avatar
mjwebb
Seasoned HDF Member
15 Year Member
Photogenic
Community Builder
Top Answer: 1
Joined: Jan 2008
Posts: 13,653
Likes: 11,421
From: State of Confusion
Default

he has a 2020 Touring model...I'd be flabbergasted if it doesn't have the vent
 
Reply
Old Apr 10, 2020 | 11:35 AM
  #10  
702's Avatar
702
Seasoned HDF Member
Joined: May 2018
Posts: 5,814
Likes: 7,145
From: Las Vegas
Default

Originally Posted by mjwebb
he has a 2020 Touring model...I'd be flabbergasted if it doesn't have the vent
Me too, but you never know........
 
Reply



All times are GMT -5. The time now is 03:15 AM.

story-0
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-1
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-2
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-3
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-4
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-5
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-6
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-7
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE
story-8
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-9
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE