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Raising I.D.numbers

Moderators: Curt!, Pa



Posts: 6

Joined: Tue May 13, 2008 8:38 pm

Post Thu Sep 04, 2008 8:33 pm

Raising I.D.numbers

Does anyone know the process to acid raise Harley numbers?What type of acid? Thanks.

Chris Haynes

Posts: 2670

Joined: Wed Jul 05, 2000 12:01 am

Location: Los Angeles, CA

Post Thu Sep 04, 2008 8:34 pm

Re: Raising I.D.numbers

Use muriatiac acid sparingly. Do it outdoors. Don't breathe the fumes.


Post Sat Sep 06, 2008 4:39 pm

Re: Raising I.D.numbers

To contain the acid, use wax to build a dam around the boss. Try alcohol first (low surface tension) to level the case. Dilute some acid with water for a test. Apply acid with a Q-tip in several passes. If it bubbles immediately it's strong enough, if not use less water.
When you see something appear, stop the acid with baking soda and rinse. Scuff the surface with Scotch-Brite etc. to see what you have. If too faint, repeat.
This will not work if the numbers have been completely ground off to roughly 2.5 × the impression depth (.150"?), starred or X'ed over, or welded.


Posts: 2

Joined: Fri Sep 12, 2008 6:49 pm

Post Sat Sep 13, 2008 6:56 am

Re: Raising I.D.numbers

The restoration process requires the surface to be smooth prior to applying the acid. It must be applied with a qtip, and on aluminum it takes quite a while. If you surround the area and flood it your number will disappear. I think we used a diluted solution of Nitric acid.

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