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Topic-icon 78 R100S

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4 months 3 weeks ago #3680 by 15295
78 R100S was created by 15295
My newly acquired S has a clunk coming from the front shock area when I hit a bump. The forks seem tight. On the centerstand, there's no wiggle when I pull the wheel sideways. PO said he put new seals on the forks. Maybe he put the shocks together wrong??

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4 months 3 weeks ago #3681 by Bret
Replied by Bret on topic 78 R100S
Was just reading an article on this last week. Click on "AirLore" on the blue line at the top of this page. From the menu select Technical Tips. On the search box enter "front end clunk". Select the first article.

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4 months 2 weeks ago #3682 by 15295
Replied by 15295 on topic 78 R100S
My bearings seem very tight and it's definitely coming from front shock. I saw one article about 80s airheads being famous for this clunk but mine is a 78. Maybe a tech day in Portland would have an answer

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4 months 2 weeks ago - 4 months 2 weeks ago #3683 by Wobbly
Replied by Wobbly on topic 78 R100S
Now incorrect assembly could possibly be the problem if the entire fork internals were disassembled. But fork internals aren't usually disturbed on a casual fork leg seal replacement job. There may be no way for you to learn at this date how extensive the older repair really was.

On a bet that it's a simple fork fluid issue (not enough or wrong viscosity), I'd drain and pump out the fork legs (while on the bike) and re-fill each leg with 250cc of ATF.

• ATF is cheap, and if it comes to disassembly you won't mind loosing it.
• ATF is about the correct viscosity.
• If AFT makes for a cure, it will mix well with real "fork oil", if you care to re-fill it weeks later.

To measure and re-install the fluid, you might want to invest in a very large (200cc ?) veterinary syringe, available at your local country drug stores, or on Ebay under "fork oil".

Draining both sides will require about 15 minutes. Refilling time will be determined by the fluid installation tools.

Don't hide 'em, Ride 'em !!
#15150
Last edit: 4 months 2 weeks ago by Wobbly.

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4 months 2 weeks ago #3685 by 15295
Replied by 15295 on topic 78 R100S
Thanks for all that. I'm gonna get the crush washers before I do the oil change. I was thinking that might be the culprit...

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4 months 2 weeks ago #3686 by 15295
Replied by 15295 on topic 78 R100S
The oil for my left Fork came out looking like weak coffee. And nothing came out my right side at all. So that's a mixed message, I hope the seal is okay inside and when I put new fluid in it it doesn't drain right back out on the ground. Pretty weird, no wonder I have such a clunking noise coming from my shocks

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