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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #11  
Old 1 Week Ago
needspeed needspeed is offline
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Quote:
Originally Posted by bustert View Post
speaking of springs, there are two types. do not remember so i would have to look it up but hd replaces one set due to corrosion issue.
Quote:
Originally Posted by bustert View Post
the fsm says
do not use cadmium plated 14 coil springs
use 16 coil cadmium springs or 14 or 16 coil black phosphatized springs
Yes, I also remember reading or hearing that there was a corrosion issue with a certain type of pawl spring. Never paid much attention to it until Bustert posted this, but does a 14 coil cadmium plated spring corrode more than a 16 coil one with the same coating just because it has 2 less coils? It's not making sense to me.

Spring force isn't the issue if a 14 coil black phosphate is OK. As long as the spring wire size is the same.

Anyone got an answer?
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  #12  
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Iron Mike Iron Mike is offline
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Mr Goldmember. Will the tag line on the bottom of your post #10 take residency on all of your foregoing posts???
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  #13  
Old 1 Week Ago
Iron Mike Iron Mike is offline
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If it’s not copyrighted, I’d like to use it myself.
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  #14  
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bustert bustert is offline
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been awhile but i think the story goes:
the early spring had issues with corrosion largely due to maintenance issues, the cadmium coating has nothing to do with it, it is mostly a storage issue. the spring material would react when oil had excess water issues and acids began to form. also, the steel and aluminum are dissimilar metals so that compounded the issue.
the newer 16 spring is a diff material, why the extra coil count i do not know, perhaps to increase shift performance (or the diff to allow recognition, a lot of dealers probably would still use them) ??? does it have more tension??? all the fsm mentions is to check free length.
the black phos is more a storage issue as well. coatings add nothing to the spring but when you have hundreds in a bin, you do not want atmospheric conditions to start rusting as pitting does effect the spring.
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  #15  
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needspeed needspeed is offline
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Quote:
Originally Posted by bustert View Post
..the early spring had issues with corrosion largely due to maintenance issues, the cadmium coating has nothing to do with it, it is mostly a storage issue...

..the newer 16 spring is a diff material..
Sounds logical. Thanks Bustert.
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