TSSM ISSUE 68921-01A - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #1 of 9 (permalink) Old 06-06-2019, 09:27 AM Thread Starter
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TSSM ISSUE 68921-01A

Hi everyone, I have a problem with Harley Fat Boy 2003 Twincam carburetor. I know TSSM is a problem and I need to replace it, but I can not find a TSSM with the same serial number as my motorcycle 68921-01A. I found 2 TSSM modules with the numbers 68921-01C and 68921-01D, differ only in the last letter of the serial number. Can you advise me if any of these modules will fit my motorcycle or do I have to look for the module with exactly the same serial number?
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post #2 of 9 (permalink) Old 06-06-2019, 10:48 AM
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The difference in the last letter just mean it is an updated version of the same part.


The D is a newer version than the A.
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post #3 of 9 (permalink) Old 06-06-2019, 10:59 AM Thread Starter
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So if I originally had an older version, the newer one should fit without a problem, I understand correctly?
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post #4 of 9 (permalink) Old 06-06-2019, 12:26 PM
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Quote:
Originally Posted by Igor Walecki View Post
So if I originally had an older version, the newer one should fit without a problem, I understand correctly?
Yup.
When they upgrade ,the letter A is added , if it upgrades again the letter advances.
The -01 tells you that 2001 is the first year that part was used in their inventory.
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post #5 of 9 (permalink) Old 06-07-2019, 03:17 PM
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Quote:
Originally Posted by candyman1340 View Post
Yup.

The -01 tells you that 2001 is the first year that part was used in their inventory.
Just an FYI

It doesn`t always mean the first year part was used, it means the year it was first produced.

Example is 35029-94 Main drive gear, which was not used on production until the `95 model year.
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post #6 of 9 (permalink) Old 06-12-2019, 09:03 AM Thread Starter
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I have one more question, I ordered a used module with serial number 68921-01C, is it possible that this module will be coded and my motor will not start and I will have to go to an authorized service to decode it? or this is a non-alarm version and it is not possible?

This is photo of module ive ordered


Last edited by Igor Walecki; 06-12-2019 at 09:07 AM. Reason: photo
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post #7 of 9 (permalink) Old 06-12-2019, 03:09 PM
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I think that part # is a TSM, not a TSSM. That is, there is no security system on the bike. If so, it should be plug and play. If not, it definitely will not start.

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post #8 of 9 (permalink) Old 06-12-2019, 03:17 PM Thread Starter
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My mistake, yes it is TSM, and in my fatboy it was TSM at first too
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post #9 of 9 (permalink) Old 06-12-2019, 07:13 PM
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Looks like you are on the right track now, but just for the record, there is a big difference between a part number and a serial number. You were looking for a particular part number. There are many parts made with the same part number. A serial number is unique to each part made. Serial number means it is part of a series and each one can be identified by a unique serial number. Not all parts that have a part number are even given serial numbers.

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