As I mentioned above, I know some DCs were partly machined away on Knuckle cylinders because some of the DC plate is still visible as proof of what happened. Here is an example.
Bruce Palmer is aware of this too and he provided a photo on page 270 of his 37–64 SE. Apparently for Knuckle cylinders the DC plate was only in this position for those produced from about mid-40 thru about mid-42?
But did any Panhead cylinders have DCs in that area? And if so, were they removed for base nut clearance?
Eric
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Cylinders for an early-50 model Panhead
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Originally posted by Chris Haynes View PostI have never seen a date code on '48-'50 as where the were was machined away for base nut clearance.
I still see no evidence that DCs on Pan cylinders were machined away for base nut clearance. What makes you think it happened with Pan cylinders for any of those three years?
Eric
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Originally posted by Chris Haynes View Post
I have several NOS cylinders with date codes. Do you think that Motor Casting Company knew whether their castings were going to be used as replacements or not?
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Originally posted by Chris Haynes View PostI have never seen a date code on '48-'50 as where the were was machined away for base nut clearance.
I too haven’t seen DCs on 1948–49 model Pan cylinders. But I’ve never seen evidence that they were machined away for base nut clearance. I know some DCs were partly machined away in that area on Knuckle cylinders because some of the DC plate is still visible as proof of what happened. But on Pan cylinders I’ve never seen evidence that their DCs were machined away in that area. Do you have evidence of this happening with 48–49 model Pan cylinders?
And you also think DCs for 50 were machined away for base nut clearance? What makes you think their DCs were in that area in the first place?
I’ve never seen evidence of DCs for 50 being machined away. Instead I’ve seen DCs on Pan cylinders for 50 and here’s one of the earliest examples I have. Judging partly by the size of the plate the DC appears to indicate casting on January 24, 1950 (as opposed to 1960).
Eric
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Originally posted by BNSONS View PostH-D Factory replacement cyl. don't have date codes.
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According to AMCA Judging Replacement or Reproduction parts are allowed on restored machines as long as it is the best available. Unrestored machines must be original parts with the exception of wear items. These being parts replaced during the normal life of a motorcycle. Tires, chains, ignition, lighting, upholstery, and any other parts replaced when they are worn out. Cylinders wear out.
I have never seen a date code on '48-'50 as where the were was machined away for base nut clearance.
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They only take a few minutes per bike.I have seen many unnoticed incorrect parts on high point restorations.Club politics have also altered judging.
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Originally posted by Chris Haynes View PostCylinders are wear items that get replaced during the life of a motorcycle.
Some cylinders may get replaced during the life of a motorcycle. But I imagine some antique motorcycles still have their original cylinders.
Here are my questions again:
1. When AMCA judges examine an early-50 model Panhead do they check the cylinders for date codes in the belief that codes from certain months should be present?
2. And if so, what is that belief based on? And what months should these codes be from?
3. Also what happens if no date codes are found but the cylinders appear to be H-D? How would judges determine if the cylinders are correct or not for an early-50 model Pan?
Eric
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Cylinders are wear items that get replaced during the life of a motorcycle.
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Cylinders for an early-50 model Panhead
I’m still trying to find out when date codes first appeared on H-D Panhead cylinders. Two weeks ago I started threads on this forum and the Panhead and Flathead forum. Both threads have received more than 90 views but no answers yet which is why I’m starting this new thread.
When AMCA judges examine an early-50 model Panhead do they check the cylinders for date codes in the belief that codes from certain months should be present?
And if so, what is that belief based on? And what months should these codes be from?
Also what happens if no date codes are found but the cylinders appear to be H-D? How would judges determine if the cylinders are correct or not for an early-50 model Pan?
Eric
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