Flathead A place to talk about Flathead motors.

How to check engine No?

Thread Tools
 
Search this Thread
 
Old Feb 13, 2020 | 08:20 PM
  #11  
harleyjohn45's Avatar
harleyjohn45
Intermediate
Joined: Nov 2007
Posts: 49
Likes: 1
From: new mexico
Default

Originally Posted by Architect
I agree that 5 digits after "WL" is too many numbers. A bunch of WLA unstamped cases still floating around, probably more by you. People seemed obligated to introduce their own numbers!?!?

I saw a set at a meet last month, claiming to be 1940 WLD, but the numbers where way too neat. Then I look at the casting number and it was 1945, the seller claimed ignorance. It happens, maybe your seller really doesn't know any better, maybe he is a thief. Hard to say, some of these shenanigans with numbers happened before we were born. Good luck, post pics for more help.
I have a WLA that was sold by the army in 1951 in Jacksonville Fl. It was a basket, but I had a title. It was a USA title, so when I rebuilt the engine, I had that USA title # stamped into the cases. It starts 51 USA xxx. So I guess it got sold as a 1951.
 
Reply
Old Feb 17, 2020 | 01:12 PM
  #12  
mr.precision's Avatar
mr.precision
Tourer
Liked
Loved
Community Favorite
Joined: Feb 2017
Posts: 256
Likes: 175
From: Fountain Hills, Arizona
Default

How about this 1942 WL?
Seems like the last digit is kinda crammed in there. Would appreciate your opinion as this bike is for sale locally.


 
Reply
Old Feb 18, 2020 | 06:30 AM
  #13  
Architect's Avatar
Architect
Seasoned HDF Member
15 Year Member
Joined: Apr 2010
Posts: 9,562
Likes: 7,915
From: Long Island, New York
Default

Do some Google Image research on VIN #'s, those do NOT look like the correct font for the factory. There is also a website with a complete library of known good numbers for comparisons. I would walk away from that VIN, good luck.
 
Reply
Old Feb 19, 2020 | 12:13 AM
  #14  
Speeding Big Twin's Avatar
Speeding Big Twin
Road Captain
Photogenic
Photoriffic
Shutterbug
Joined: Feb 2009
Posts: 695
Likes: 394
From: Western Australia
Default

Originally Posted by mr.precision
How about this 1942 WL?
Seems like the last digit is kinda crammed in there. Would appreciate your opinion as this bike is for sale locally.
That is the second version I’ve seen of that serial number.

The first version, which appeared authentic, I saved photos of a while ago. And I also saved photos of the belly numbers.

But as for the photo of that second version, I agree with Architect and the characters are not consistent with factory stamping for a 42WLA. Notice the 4s are sans serif and have an open back. For 42WLAs, at that stage of numbering, the 4s usually had a closed top and a serif across the base. (Later in 42WLA numbering the 4 changed to open top with serif across the base.)

Notice the 2s are sans serif. They normally had a vertical serif at bottom right.
The letter used as W is wrong and it looks like M upside down.
Notice the 3 is sans serif. Normally it had a vertical serif at top left.
Notice the 9 and 6 are a round-back style. Normally for 42WLAs the 9/6 had a straight back.

Just out of curiosity, what are the belly numbers?
Eric
 
Reply
Old Feb 19, 2020 | 07:05 AM
  #15  
mr.precision's Avatar
mr.precision
Tourer
Liked
Loved
Community Favorite
Joined: Feb 2017
Posts: 256
Likes: 175
From: Fountain Hills, Arizona
Default

The case numbers are definitely incorrect. I enlarged the the first picture and you can plainly see the last 6 is overstamped on top of a 9. And, of course, the fonts are incorrect. And the upside down M really looks ridiculous.
As for belly numbers, here they are. Not sure the fonts on them are correct either.
Speeding BigTwin - are you saying that you have seen, or photographed, a set of numbers identical to these? I'd sure like to see them. If you don't want to share the photo, just confirm for me. This bike in question has a legit title.
I am taking this example at face value.....if the money is right, just buy it and have some fun with it.
Appreciate the comments.





 
Reply
Old Feb 19, 2020 | 10:11 PM
  #16  
Speeding Big Twin's Avatar
Speeding Big Twin
Road Captain
Photogenic
Photoriffic
Shutterbug
Joined: Feb 2009
Posts: 695
Likes: 394
From: Western Australia
Default

I have a photo of an authentic-looking version of that SN and I can email it to you if you wish. I sent you my address via PM. The BNs are 43-25+++A and they appear authentic so I could send you a picture of them in full as well. Why is the letter A at the end of the BNs? I do not know for certain but in this instance I don’t think it’s a concern and I have many other examples of it with BNs that appear factory-stamped.

Re the BNs you posted, they look like 43-6749? Some characters aren’t clear but I can’t see anything wrong at this stage. Decade 4 is probably sans serif and I’d expect it to have an open back. That type of 4 was used in the BN decade position for 1941–46. The 3 probably has a flat top and no serif. The 4 and 3 are often done with a tandem stamp and line up neatly with each other.

I don’t see a dash or hyphen in the R-H BN but I don’t think it’s a concern and it’s not the first time it’s been missing for 1943.

Sequence 6/9 is the round-back style I’d expect for 1943 BNs. (H-D used more than one type of round-back 6/9 in BNs over the years.)
The 7 looks normal for 1943 and it was also used in BN sequence portions for several other years. Notice it is sans serif and also notice the style of back.
Open-top 4 is normal in the BN sequence portion for 1943. Notice the serif across the base.
Eric
 
Reply
Old Feb 20, 2020 | 08:44 PM
  #17  
Speeding Big Twin's Avatar
Speeding Big Twin
Road Captain
Photogenic
Photoriffic
Shutterbug
Joined: Feb 2009
Posts: 695
Likes: 394
From: Western Australia
Default

I sent you two photos via email.
Eric


 
Reply
Old Jul 20, 2020 | 11:24 AM
  #18  
FarmerBarker01's Avatar
FarmerBarker01
Stage II
Joined: Jul 2020
Posts: 2
Likes: 0
From: Yorkshire
Default SN Question

Just a question about a serial number on a Harley WLA I’m thinking of buying but unsure about the numbers could anyone help?
Thanks in advance!!
 
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 Jul 20, 2020 | 11:55 AM
  #19  
Architect's Avatar
Architect
Seasoned HDF Member
15 Year Member
Joined: Apr 2010
Posts: 9,562
Likes: 7,915
From: Long Island, New York
Default

Speeding Big Twin is our resident expert, but I will take a swing.

First, as this thread started, too many numbers. Should only be four digits after the WLA.

Then comparing the characters to the font on my legit '46, the 4 and W are not an exact match. The top left of the 4 has a little too much curve and the W seems a little tall. The bottom line of the 1 also looks long.

Good luck.
 
Reply
Old Jul 20, 2020 | 06:52 PM
  #20  
johnjzjz's Avatar
johnjzjz
Seasoned HDF Member
15 Year Member
Top Answer: 3
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
Default

they made 60,000 i believe is the number of WLA complete machines - mine was 300 from the last one built in 1945
 
Reply



All times are GMT -5. The time now is 07:18 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