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

2018 M8----Sumping? Failures?

Thread Tools
 
Search this Thread
 
Old Mar 19, 2018 | 09:03 PM
  #111  
tbob's Avatar
tbob
Outstanding HDF Member
Joined: Oct 2009
Posts: 2,791
Likes: 690
From: Smalltown,USA
Default

Your post should be in the sub forum,I ran the dog **** out of my new bike and it left me stranded.Nobody and I mean nobody on a forum could tell you what's wrong. I alway's tell my drivers when your right foot out runs your brain your *** will be the first to know.
 
Old Mar 20, 2018 | 06:12 AM
  #112  
RichComp's Avatar
RichComp
6th Gear
Joined: Mar 2018
Posts: 11
Likes: 8
From: Southwest Florida
Default

The dealer will be working on the bike today, I’ll update findings and the warranty name, my paperwork is in the saddle bag.
 
Old Mar 20, 2018 | 06:26 AM
  #113  
tbob's Avatar
tbob
Outstanding HDF Member
Joined: Oct 2009
Posts: 2,791
Likes: 690
From: Smalltown,USA
Default

I never dyno a new Harley or run them hard,they just aren't made for it .The rotating mass is heavy and doesen't play well at high RPMs. I alway's let the internals mate and play together ,around 7,000 miles things loosen up and you can feel the motor run better.
The best running Harley for durability is a stock motor. Guy's that say I'm wrong are either a vendor or have spent the cash already .
 
Old Mar 20, 2018 | 08:22 PM
  #114  
FLSTFI Dave's Avatar
FLSTFI Dave
Seasoned HDF Member
Veteran: Navy
5 Year Member
Community Favorite
Top Answer: 5
Joined: Nov 2016
Posts: 6,088
Likes: 6,446
From: East TN
Default

Originally Posted by tbob
I never dyno a new Harley or run them hard,they just aren't made for it .The rotating mass is heavy and doesen't play well at high RPMs. I alway's let the internals mate and play together ,around 7,000 miles things loosen up and you can feel the motor run better.
The best running Harley for durability is a stock motor. Guy's that say I'm wrong are either a vendor or have spent the cash already .
The only harleys that have ever left me stranded, or had major failures have been stock except for Exhaust and tune. 09 CVO RG had failed lifters that took out top end. 12 CVO RG had two failed compensators, one failed clutch master cylinder and a failed regulator. 15 CVO RGU had failed lifters that were so bad HD replaced the Engine under warranty.

13 CVO King with a built motor, no issues so far.
17 CVO SG had no issues but traded at 21K so low miles compaired to all the above bikes.
18 CVO RG, has fullsac exhaust and tune on dyno. 8k miles no issues so far.

I well built motor in my opinion is more reliable as better tolerances are used for all parts if its built right. A low budget build, then I agree with you.
 
Old Mar 20, 2018 | 08:59 PM
  #115  
tbob's Avatar
tbob
Outstanding HDF Member
Joined: Oct 2009
Posts: 2,791
Likes: 690
From: Smalltown,USA
Default

Originally Posted by FLSTFI Dave
The only harleys that have ever left me stranded, or had major failures have been stock except for Exhaust and tune. 09 CVO RG had failed lifters that took out top end. 12 CVO RG had two failed compensators, one failed clutch master cylinder and a failed regulator. 15 CVO RGU had failed lifters that were so bad HD replaced the Engine under warranty.

13 CVO King with a built motor, no issues so far.
17 CVO SG had no issues but traded at 21K so low miles compaired to all the above bikes.
18 CVO RG, has fullsac exhaust and tune on dyno. 8k miles no issues so far.

I well built motor in my opinion is more reliable as better tolerances are used for all parts if its built right. A low budget build, then I agree with you.
The problem is cheap build and chasing HP,bad combination. And the 110 was a disaster from the gate.The 96 and 103 stock form bullet proof, maybe a lifter problem but nothing major.
 
Old Mar 21, 2018 | 07:36 PM
  #116  
FLSTFI Dave's Avatar
FLSTFI Dave
Seasoned HDF Member
Veteran: Navy
5 Year Member
Community Favorite
Top Answer: 5
Joined: Nov 2016
Posts: 6,088
Likes: 6,446
From: East TN
Default

Originally Posted by tbob
The problem is cheap build and chasing HP,bad combination. And the 110 was a disaster from the gate.The 96 and 103 stock form bullet proof, maybe a lifter problem but nothing major.
I do agree, my wife has an 09 Heritage, 96" motor. 98K miles on the bike, only issue so far has been a failed stator at 52K miles, which was covered under factory warranty. We have never had troubles with our 88", 96" or 103" motors. 110's have had lots of troubles.

I built my 110 for a good flat torque curve and reliability. Its given that so far.
 
Old Mar 22, 2018 | 08:55 AM
  #117  
buckeye hog's Avatar
buckeye hog
Novice
10 Year Member
Liked
Loved
Community Favorite
Joined: Jan 2012
Posts: 21
Likes: 3
From: eastern ohio
Default

Just Joined the sumping club, 2018 Anniversary Ultra.Not sure of the build date but #97 of 3700..Bike went into the shop Monday evening ,got a call with the diagnosis Tuesday and upon further inspection they found no engine damage,Putting in a new updated Oil pump and should be back by Friday..Bike only has 1500 miles on it and it was smoking bad by the time I got to an area on the road to pull over..They say no damage done to the cylinders,but how was the oil getting into the combustion area? And BTW Bone stock with the exception of aftermarket pipes..
 
Old Mar 22, 2018 | 09:40 AM
  #118  
Max Headflow's Avatar
Max Headflow
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,928
Likes: 8,030
From: poway
Default

Originally Posted by buckeye hog
Just Joined the sumping club, 2018 Anniversary Ultra.Not sure of the build date but #97 of 3700..Bike went into the shop Monday evening ,got a call with the diagnosis Tuesday and upon further inspection they found no engine damage,Putting in a new updated Oil pump and should be back by Friday..Bike only has 1500 miles on it and it was smoking bad by the time I got to an area on the road to pull over..They say no damage done to the cylinders,but how was the oil getting into the combustion area? And BTW Bone stock with the exception of aftermarket pipes..

Through the breather vent.
 
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 Mar 22, 2018 | 10:29 AM
  #119  
Oldpanrider's Avatar
Oldpanrider
Cruiser
Joined: Oct 2006
Posts: 148
Likes: 6
From: Wilds of Oklahoma
Default

Wow, like I said I guess I'm just lucky. 3 new Harley's in the last 10 years and not one warranty claim. I feel for you guys.
 
Old Mar 22, 2018 | 12:56 PM
  #120  
buckeye hog's Avatar
buckeye hog
Novice
10 Year Member
Liked
Loved
Community Favorite
Joined: Jan 2012
Posts: 21
Likes: 3
From: eastern ohio
Default

Thanks Max, Just talked to the tech at the dealership before I saw your response and he said the same thing..Also said that this new oil pump is the 4th version for the M8
 



All times are GMT -5. The time now is 02:44 PM.

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