Here a better Picture

 

Thanks for posting the full page of Factory Assembly Number Data.

I agree Steve Slocombe is very good but the only book I have by him is for the 30–36 V-series. I don’t have any of Steve’s other books. Can you post photos of both sides of a 24 from Steve’s book please.

You may believe the bike is a 1924 but you do not know for certain. And I too do not know what year it is. That is one of the reasons I repeatedly asked for photos of the belly numbers.

Numbers are correct? Have you not read what I keep saying about certain problems with that engine number? The title you gave this thread was ‘Need Identify Enginenumber’ but you’re completely disregarding the opinions provided about it so far. If you think that engine number is correct then it’s pointless asking for assistance with it in the first place.

Re the oil pump, that website shows an alleged 24 with vertical pump but according to Jerry Hatfield’s 1903–1945 book the pump changed as of certain late-22 models. Here’s what Hatfield says on page 50:
‘Late 1922 V-twins above motor 8000 were fitted with a new double-plunger oil pump. The pump consisted of a horizontal cylinder …’

That’s part of the reason why I said the R-H side of the engine looks more like early/mid-22 or earlier.

Hatfield’s mention of a new pump as of late-22 v-twins is consistent with my 26–39 H-D parts catalog which lists a certain oil pump assembly (#587-22) for later-22–27 twins.

And from a 1924 H-D Rider’s Hand Book here is page 9 of Section Two. The illustration isn’t great but the pump looks horizontal to me.
Eric

 

On the case with the alleged 25 engine number notice the area immediately above said number.





But that area is not present on the next case. And that seems to be one of the changes made to the left case as of 1925 models which would of course be consistent with it having casting number 2-25 as you can see.
Eric

 

So finaly
Today information from Harley Davidson Customer Service Milwaukee
I received a response from our archives manager and collections specialist. According to our expert, the VIN numbers/information you submitted are way to stylized to be from our stamping. The first reference that he knew of for FHA bikes, were a couple years later. They were FHAC and FHAD models which were hill climbing bikes. We have a bike in our collection that is from 1924, and was factory built in a keystone frame (typical hill climbing frame). The numbers on the crankcase do not resemble the ones in the photo at all.
Thanks

 

Way too stylized? Exactly what does that mean? Was the ‘expert’ talking about the serifs on the letters? If so did he think there should be no serifs on letters in the engine number of a race bike/hill climber? Or did he think there should be no serifs on letters in the engine number of any H-D in those days? (There were.)
Did the 'expert' mention the character that looks like the letter I instead of the number 1?
And what did the 'expert' say about the R-H side of the engine?
Also it seems the ‘expert’ did not ask for photos of the belly numbers?

Even though I still think there are problems with the engine number I suggest contacting H-D again and ask what was meant by ‘way too stylized’ and you could also send them a link to this discussion.

It sounds like the first reference the ‘expert’ knows of for FHA bikes may be 1927? If so it could be because that is when an FHAC and an FHAD are mentioned in The Legend Begins as per page 200.







However page 198 says info concerning production figures and model descriptions on pages 199 and higher is NOT to be regarded as totally accurate.





This means of course the author of the book did not know for certain what the first year was for an FHAC and/or an FHAD.
Eric