Rebuild forks, flush before fill question


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JohnUSA
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Rebuild forks, flush before fill question

Post by JohnUSA » Tue Aug 06, 2019 11:21 pm



I've been reading the tutorials and, at least twice, have read to pour fork oil in to flush the tube.

I've ordered BelRay fork oil.

Can I use ATF fluid to do a flush, and then fill with the BelRay?

Are they compatible?

If I did the math correctly, one bottle of BelRay will do both tubes, but I don't want to end up short by using it to flush with. I have extra ATF on the shelf.

Thanks.



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Happytrails
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Re: Rebuild forks, flush before fill question

Post by Happytrails » Wed Aug 07, 2019 5:41 am

Not sure but my guess would be its ok. I just ordered parts to do this as well. Wasnt sure if 1 bottle would be enough so ordered 2 of the 10w belray. Its long overdue for my bike so glad to get started on it. :)
1991 GL1500 SE Anniversary Edition
Sun Flare Gold Metallic
Vallant Brown Inset

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CrystalPistol
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Re: Rebuild forks, flush before fill question

Post by CrystalPistol » Wed Aug 07, 2019 11:07 am

JohnUSA wrote:
Tue Aug 06, 2019 11:21 pm
I've been reading the tutorials and, at least twice, have read to pour fork oil in to flush the tube.

I've ordered BelRay fork oil.

Can I use ATF fluid to do a flush, and then fill with the BelRay?
YES
… the ATF is thin enough that most all of it will drain anyway. Just put drain plug back ion after ATF drains. I usually will grab front brake and push bike with brake on to "pump" the forks a few extra spurts. I've done it & never had an issue. ATF is near 20wgt …. no harm.
Image

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Happytrails
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Re: Rebuild forks, flush before fill question

Post by Happytrails » Wed Aug 07, 2019 2:52 pm

So giving some thoughts on replacing my top fork caps to make it a bit easier to do oil changes. Should I purchase #29 or #29? I can't tell the difference except one says 305 and the other says 505. I dont think its a right and left thing is it? Or am I overthinking this and should stay with what I have and just deal with the oil changes? :D



1991 GL1500 SE Anniversary Edition
Sun Flare Gold Metallic
Vallant Brown Inset

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CrystalPistol
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Re: Rebuild forks, flush before fill question

Post by CrystalPistol » Wed Aug 07, 2019 3:50 pm

Happytrails wrote:
Wed Aug 07, 2019 2:52 pm
So giving some thoughts on replacing my top fork caps to make it a bit easier to do oil changes. Should I purchase #29 or #29? … :D
I vote for #29. :P
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Rambozo
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Re: Rebuild forks, flush before fill question

Post by Rambozo » Wed Aug 07, 2019 4:15 pm

CrystalPistol wrote:
Wed Aug 07, 2019 3:50 pm
Happytrails wrote:
Wed Aug 07, 2019 2:52 pm
So giving some thoughts on replacing my top fork caps to make it a bit easier to do oil changes. Should I purchase #29 or #29? … :D
I vote for #29. :P
I say #58. (you need two after all.) ;)
And don't forget #62 for a pair of caps. :twisted: :lol: :lol: :lol:

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Charlie1Horse
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Re: Rebuild forks, flush before fill question

Post by Charlie1Horse » Wed Aug 07, 2019 8:54 pm

1 - #29 and 1 - #31 for each side. Or else you could center punch and drill each existing plug and thread for a schrader valve. It's more work but, less expensive although you would still have to order the caps.
Russell

Those who say it cannot be done should try not to interrupt those who are doing it.

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WingAdmin
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Re: Rebuild forks, flush before fill question

Post by WingAdmin » Tue Aug 13, 2019 10:16 am

JohnUSA wrote:
Tue Aug 06, 2019 11:21 pm
I've been reading the tutorials and, at least twice, have read to pour fork oil in to flush the tube.

I've ordered BelRay fork oil.

Can I use ATF fluid to do a flush, and then fill with the BelRay?

Are they compatible?

If I did the math correctly, one bottle of BelRay will do both tubes, but I don't want to end up short by using it to flush with. I have extra ATF on the shelf.

Thanks.
Yes, they are compatible.

What I do is drain the old fluid, and flush with brake cleaner, which is a terrific solvent that will dissolve any accumulated sludge. I let that drain out, then flush again with a decent quantity fork oil or ATF or whatever, to make sure there is no brake cleaner left. Then replace the drain plug and fill the fork.

JohnUSA
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Re: Rebuild forks, flush before fill question

Post by JohnUSA » Tue Aug 13, 2019 12:55 pm

Happytrails wrote:
Wed Aug 07, 2019 2:52 pm
So giving some thoughts on replacing my top fork caps to make it a bit easier to do oil changes. Should I purchase #29 or #29? I can't tell the difference except one says 305 and the other says 505. I dont think its a right and left thing is it? Or am I overthinking this and should stay with what I have and just deal with the oil changes? :D

48482809892_b2c52ef5f7_b.jpg
Happy- if you have not ordered a set of fork caps up, and you are not in a hurry, I might have a set you can have. I’m out of country until Saturday, though. Let me know.

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Happytrails
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Re: Rebuild forks, flush before fill question

Post by Happytrails » Wed Aug 14, 2019 6:17 pm

JohnUSA wrote:
Tue Aug 13, 2019 12:55 pm
Happytrails wrote:
Wed Aug 07, 2019 2:52 pm
So giving some thoughts on replacing my top fork caps to make it a bit easier to do oil changes. Should I purchase #29 or #29? I can't tell the difference except one says 305 and the other says 505. I dont think its a right and left thing is it? Or am I overthinking this and should stay with what I have and just deal with the oil changes? :D

48482809892_b2c52ef5f7_b.jpg
Happy- if you have not ordered a set of fork caps up, and you are not in a hurry, I might have a set you can have. I’m out of country until Saturday, though. Let me know.
Thanks John, I didn't order caps yet. Finally got the bike back together tonite. It may have had ATF fluid in it and I replaced it with 10w fork oil. It feels softer.




1991 GL1500 SE Anniversary Edition
Sun Flare Gold Metallic
Vallant Brown Inset

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curtm
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Re: Rebuild forks, flush before fill question

Post by curtm » Thu Aug 15, 2019 6:34 pm

No need to buy different caps, just drill and tap to 1/8" NPT and go to tire palce and get adapters and screw in, i wrote a post on this a few months ago
Curt

JohnUSA
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Re: Rebuild forks, flush before fill question

Post by JohnUSA » Sun Aug 18, 2019 12:25 am

Happy- if you have not ordered a set of fork caps up, and you are not in a hurry, I might have a set you can have. I’m out of country until Saturday, though. Let me know.
Thanks John, I didn't order caps yet. Finally got the bike back together tonite. It may have had ATF fluid in it and I replaced it with 10w fork oil. It feels softer.

48539710106_77f80ee6f0_b.jpg

48539710066_23226b7ec4_b.jpg
[/quote]

I do have a set. They are yours for cost of shipping, if you still need/want them. They don't have the Schrader valves, by the way.

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Happytrails
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Re: Rebuild forks, flush before fill question

Post by Happytrails » Tue Aug 20, 2019 8:34 am

Whats the interval for fork oil changes every couple years or so?
1991 GL1500 SE Anniversary Edition
Sun Flare Gold Metallic
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bellboy40
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Re: Rebuild forks, flush before fill question

Post by bellboy40 » Wed Aug 21, 2019 8:21 am

I don't see any interval for changing the fork fluid in the service manual. I think every 2-3 years would be a reasonable interval, provided you don't see any leaks in between.



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