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

ACR's Blowing Out

Old Mar 3, 2026 | 04:20 PM
  #1  
roussfam's Avatar
roussfam
Thread Starter
|
Seasoned HDF Member
15 Year Member
Top Answer: 1
Top Answer: 3
Top Answer: 5
Joined: Jan 2009
Posts: 12,675
Likes: 8,277
From: Ottawa, Ontario
Default ACR's Blowing Out

There's a couple of M8 Facebook groups that I subscribe to and I've noticed I've been seeing a lot of posts about ACR's blowing out.

It was pretty rare that I would see a post about this happening on a twin cam when I had one.

Are M8's more prone to this?
 
Reply
Old Mar 6, 2026 | 10:08 AM
  #2  
Steve Cole's Avatar
Steve Cole
HD EFI Guru
15 Year Member
Top Answer: 1
Top Answer: 3
Top Answer: 5
Joined: Jan 2008
Posts: 4,462
Likes: 4,718
Default

If an ACR starts to come loose they have been known to blow out, no different from Twin Cam to M8. If your worried about it have them checked.
 
Reply
Old Mar 6, 2026 | 11:04 AM
  #3  
sumncguy's Avatar
sumncguy
Stellar HDF Member
Veteran: Navy
15 Year Member
Liked
Community Favorite
Joined: Aug 2006
Posts: 2,151
Likes: 406
From: Hurdle Mills NC
Default

Originally Posted by roussfam
There's a couple of M8 Facebook groups that I subscribe to and I've noticed I've been seeing a lot of posts about ACR's blowing out.

It was pretty rare that I would see a post about this happening on a twin cam when I had one.

Are M8's more prone to this?
My 2019 did it. Helicoil no fix. Head replacement.
 
Reply
Old Mar 8, 2026 | 08:07 AM
  #4  
wfolarry's Avatar
wfolarry
Tourer
15 Year Member
Liked
Loved
Community Favorite
Joined: Apr 2007
Posts: 411
Likes: 281
From:
Default

I remember it being a problem for the local dealer here in the first years.
That thread coating HD uses seems to be working better. Don't see as many loose ones now.
If it's stripped out it can be repaired
 
Reply
Old Mar 8, 2026 | 09:30 AM
  #5  
sumncguy's Avatar
sumncguy
Stellar HDF Member
Veteran: Navy
15 Year Member
Liked
Community Favorite
Joined: Aug 2006
Posts: 2,151
Likes: 406
From: Hurdle Mills NC
Default

They put helicoils in mine. Bike still ran like crap. $3000 just after the attempted fix.

Now every time the pliugs are changed on my 24, Ill ask that the ACRs be checked. Maybe torqued.
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
liamw76
Blowers/Turbos/Nitrous Oxide
4
Aug 23, 2019 10:26 PM
Big Dave
General Topics/Tech Tips
5
Apr 8, 2019 01:31 PM
markymark02
General Harley Davidson Chat
2
Apr 26, 2010 09:08 PM
huffhuff
Exhaust System Topics
3
Apr 15, 2010 01:19 PM
crusader1xxx
Touring Models
27
Sep 18, 2008 06:10 PM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 03:21 PM.

story-0
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-1
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-2
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-3
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-4
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-5
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-6
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-7
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-8
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
story-9
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

Slideshow: Graeme Billington's left-hand-drive Shovelhead is as much about problem-solving as it is about classic Harley form.

By Verdad Gallardo | 2025-12-30 11:27:08


VIEW MORE