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Whats the consensus on the best weight fork oil to use in a 1982 GL500 Interstate.



Thanks....

Barry
Again, there is no industry standard for fork oil weight. 10 weight by one company might be 20 weight by another company. I like Bellray 10 for most applications.



Transmission fluid is basically the same as Honda 10 weight fork oil.
 

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Again, there is no industry standard for fork oil weight. 10 weight by one company might be 20 weight by another company. I like Bellray 10 for most applications.



Transmission fluid is basically the same as Honda 10 weight fork oil.




That's why I always recommend BelRay fork oil.
 

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The operator's manual and all tech manuals I have specifies using Dexron automatic transmission fluid. Each one requires 210cc (7.1 oz).
 

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Discussion Starter · #6 ·
The operator's manual and all tech manuals I have specifies using Dexron automatic transmission fluid. Each one requires 210cc (7.1 oz).


Just a note....80s transmission fluid was just that.....fluid.

Today the tranny fluid has a metal added to it. I can't remember if its zinc, copper, ???.

But a number of guys over at the SuperSport site really recommend against it because of the metal component.
 

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I have Bel-Ray 15wt in the forks of my project GL500i, plus on David's suggestion I added a Tarozzi fork brace. I don't know for sure which of the two helps the most but it is now a very nice riding and handling bike, for a GL500i anyway... I am very happy with the result.
 

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The operator's manual and all tech manuals I have specifies using Dexron automatic transmission fluid. Each one requires 210cc (7.1 oz).


I don't personally know why they called for ATF back in the 70's, but I do know from personal experience switching from ATF to a heavier weight fork oil will definitely help your ride and handling. I went from being on a rocking horse to having a semi-controlled smooth ride, but I did also put new springs in the front and new shocks out back.
 

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Just a note....80s transmission fluid was just that.....fluid.

Today the tranny fluid has a metal added to it. I can't remember if its zinc, copper, ???.

But a number of guys over at the SuperSport site really recommend against it because of the metal component.




Was wondering about this ... I used modern ATF and one of the forks leaked from the bottom over the winter. Maybe it's just the gasket getting brittle but I'm not doing that again. (81 cx500c engine and frame, 82 forks.)
 

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I also used aft at one time and the next year I was replacing the right seal.



So for me its honda seals and belray 20w.
 

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Was wondering about this ... I used modern ATF and one of the forks leaked from the bottom over the winter. Maybe it's just the gasket getting brittle but I'm not doing that again. (81 cx500c engine and frame, 82 forks.)


I have rebuilt my forks about 5 times and cant keep seals in them so i am no expert but there is a copper washer on the bottom of the allen head screw that screws into the bottom of the fork. you can heat it up to red hot with a torch to anneal it and make it soft again or maybe it is missing. that is where it sounds like your leak came from. not the type of fluid.
 
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