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TOPIC: Re:Forks question
#1002735
jjvw (User)
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Forks question 12 Months ago  
When I triked my roadie, I had to rake it and add 2" extensions. T steel ex are wrecking the aluminum threads in the upper tubes. Can you just replace the tubes or must they be a matched set?
 
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#1002740
davej (User)
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Re:Forks question 12 Months ago  
You can replace the tubes just make sure the internal components are the same side to side.
 
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#1002867
tapeit59 (User)
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Re:Forks question 12 Months ago  
The fork tubes are aluminium? I thought they where steel!
 
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#1002887
Spydr (User)
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Re:Forks question 12 Months ago  
tapeit59 wrote:
The fork tubes are aluminium? I thought they where steel!

I'm pretty sure they're steel... Cuz aluminum don't Rust!
 
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#1002889
jd750ace (User)
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Re:Forks question 12 Months ago  
The tubes are steel. The typical +2 slug was made from aluminum. Dissimilar metal corrosion. You need a sacrificial material between the two that eliminates as much oxygen as practical and will oxidize itself and prevent the two base metals from oxidizing. We use milk of magnesia on some aircraft parts as an anti corrosive and anti seize compound. Other solutions would be zinc phosphate, manganese phosphate, zinc chromate putty, or a corrosion inhibiting sealant.
Although I say all this, my SV650 has aluminum caps from the factory with 84K miles on it (2002) and they have not corroded.

It may also very well be the alloy of the material they used to make the slugs.

7075 and 2024 aluminum alloys corrode readily when in contact with moisture and steel.

3000 series and 5000 series alloys have high corrosion resistance, but not very high tensile strength, and are typically used in sheet form rather than forgings or extrusions.

6061 aluminum alloy extrusion is what I use on motorcycles, because it is the best balance of strength and corrosion resistance in a structural alloy that is not a newer hyper alloy (and ridiculously expensive for the things I do) If I am using the full shape, I got for the higher developed properties of the cold worked variety of this alloy, as the post quench cold forming tightens the grain of the metal even more. If I'm turning it down or machining away from plate, the benefits are lost, so it's not a consideration.

Regardless, it should be your slugs that are taking the beating, not the steel tubes.
 
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jjvw (User)
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Re:Forks question 11 Months, 4 Weeks ago  
ya their steel. Storry I'm getting old
the extensions are steel too
 
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Last Edit: 2017/03/02 15:19 By jjvw. Reason: sp
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#1003008
Flashback (Moderator)
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Re:Forks question 11 Months, 4 Weeks ago  
the extensions probably weren't torqued enough if you have thread damage in the tubes......
 
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#1003028
jd750ace (User)
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Re:Forks question 11 Months, 4 Weeks ago  
Flashback wrote:
the extensions probably weren't torqued enough if you have thread damage in the tubes......

+1
 
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#1003178
takehikes (User)
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Re:Forks question 11 Months, 3 Weeks ago  
steel slugs to steel tubes should never be an issue unless they weren't tightened right in first place.
We sold plenty of slugs back in the day and they work great.
 
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