EVO All Evo Model Discussion

Viewer be advised

Thread Tools
 
Search this Thread
 
Old Sep 21, 2025 | 10:43 AM
  #1  
daven9113's Avatar
daven9113
Thread Starter
|
Road Master
15 Year Member
Liked
Loved
Community Favorite
Joined: Aug 2007
Posts: 942
Likes: 323
From: Grew up in Texas, moved to AZ
Default Viewer be advised

Halloween is coming, so here’s some scary stuff for you old guys. I bought a project Evo motor. Seller said engine overheated, but rebuildable case. Hoping for the best, but expecting the worse.

Tearing it down, there was debris all inside cam chest, but lifters, cam, heads and rocker boxes all good.

Once the rear head came off, I think I found the possible reason of the loss of compression. Haha




Definitely not stock piston.


Front cylinder and piston.


I wanted a project, and I got one. 😂😂
 
Old Sep 21, 2025 | 11:47 AM
  #2  
SparkyD's Avatar
SparkyD
Road Master
10 Year Member
Liked
Loved
Community Favorite
Joined: May 2012
Posts: 799
Likes: 333
From: Washington State
Default

Should be able to weld that up . . . ???
 
Reply
Old Sep 21, 2025 | 11:51 AM
  #3  
Paintslinger16's Avatar
Paintslinger16
Stellar HDF Member
Active Streak: 120 Days
Joined: Aug 2018
Posts: 2,392
Likes: 2,628
From: Milwaukee, WI
Default

Little JB weld you will be fine
 
Reply
Old Sep 21, 2025 | 12:03 PM
  #4  
Rains2much's Avatar
Rains2much
Grand HDF Member
Photogenic
Photoriffic
Shutterbug
Top Answer: 5
Joined: Sep 2022
Posts: 4,426
Likes: 3,832
From: Florida
Default

Some guys over engineer…no need to go to something like JB weld. Get you some Temu compression leak additives.
 
Reply
Old Sep 21, 2025 | 01:50 PM
  #5  
SparkyD's Avatar
SparkyD
Road Master
10 Year Member
Liked
Loved
Community Favorite
Joined: May 2012
Posts: 799
Likes: 333
From: Washington State
Default

Daven9113 is never going to talk to us again
 
Reply
Old Sep 21, 2025 | 02:57 PM
  #6  
Illinois_Minion's Avatar
Illinois_Minion
Road Captain
5 Year Member
Liked
Loved
Community Favorite
Joined: Feb 2020
Posts: 733
Likes: 909
From: Concrete jungle
Default

Originally Posted by Rains2much
Some guys over engineer…no need to go to something like JB weld. Get you some Temu compression leak additives.
Couldn't he epoxy a mason jar lid over it??
 
Reply
Old Sep 21, 2025 | 04:23 PM
  #7  
HarvHD's Avatar
HarvHD
Cruiser
Joined: Apr 2025
Posts: 163
Likes: 85
From: Okanagan Valley, British Columbia
Default

A little overheated I’d say
 
Reply
Old Sep 21, 2025 | 04:31 PM
  #8  
Dan89FLSTC's Avatar
Dan89FLSTC
Seasoned HDF Member
Veteran: Navy
Active Streak: 30 Days
Top Answer: 3
Top Answer: 5
Joined: May 2008
Posts: 21,146
Likes: 12,713
From: South Carolina
Default

Originally Posted by Illinois_Minion
Couldn't he epoxy a mason jar lid over it??
Don`t be ridiculous, everyone knows the lid should be riveted on...
 

Last edited by Dan89FLSTC; Sep 21, 2025 at 04:44 PM.
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 Sep 21, 2025 | 04:46 PM
  #9  
CoolBreeze3646's Avatar
CoolBreeze3646
Seasoned HDF Member
Joined: Aug 2006
Posts: 24,496
Likes: 30,783
From: Pennsylvania
Default

Might buff out with a little effort. Rounders may be along to tell you about his rebuild and to check the rods to make sure they fall away correctly.
 
Reply
Old Sep 21, 2025 | 05:47 PM
  #10  
IBDAGRIZ's Avatar
IBDAGRIZ
Road Master
10 Year Member
Liked
Loved
Community Favorite
Joined: Sep 2013
Posts: 1,054
Likes: 441
From: Tejas
Default

Originally Posted by daven9113
Halloween is coming, so here’s some scary stuff for you old guys. I bought a project Evo motor. Seller said engine overheated, but rebuildable case. Hoping for the best, but expecting the worse.

Tearing it down, there was debris all inside cam chest, but lifters, cam, heads and rocker boxes all good.

Once the rear head came off, I think I found the possible reason of the loss of compression. Haha


I wanted a project, and I got one. 😂😂
Big jump brother.
I may have a set of .010 over stock pistons lying around. I'll take a look when I get a chance.
Definitely use a top notch 3 hole crank pin going back together with the lower end.
Have fun.

Griz
 
Reply



All times are GMT -5. The time now is 03:07 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