my forks go clunk

Information on forks/springers/shocks
Post Reply
john HD
Moderator
Posts: 3677
Joined: Sat Aug 20, 2005 7:24 pm
Bikes: '42 WLA X 2, '55FL, '93 Ultra Classic, '91 Fatboy, '97 883, '71 Suzuki Duster 125, '83 GPz 750.
Has thanked: 52 times
Been thanked: 77 times

my forks go clunk

#1

Post by john HD » Sat Aug 20, 2005 7:30 pm

hey folks, i have a basicly stock '55 FL.

my problem is that everytime i encounter a bump in the road my forks clunk.

i am going to davenport this year as always, just wondering what you guys might suggest as to a shopping list for repair parts?

thanks in advance.

john
You do not have the required permissions to view the files attached to this post.



chucktx
Posts: 35
Joined: Sat Jan 22, 2005 9:16 am
Location: texas

#2

Post by chucktx » Mon Aug 22, 2005 2:41 am

hi john, welcome to the board.........nice pan!!!!! i would check the oil in the forks, it may be low or empty. it can slowly over time run out the bottom of the forks. sometimes it may leave a trace of the leak, other times it may just blend in with the rest of the road grime. good luck and im sure you will get other answers also!!!
chucktx

john HD
Moderator
Posts: 3677
Joined: Sat Aug 20, 2005 7:24 pm
Bikes: '42 WLA X 2, '55FL, '93 Ultra Classic, '91 Fatboy, '97 883, '71 Suzuki Duster 125, '83 GPz 750.
Has thanked: 52 times
Been thanked: 77 times

#3

Post by john HD » Mon Aug 22, 2005 4:10 am

thanks for the tip chuck. i do believe it is ok in the oil department.

i was out on it today and noticed the clunk is definately when the sliders top out.

i cannot ever remember bottoming out the forks, they have pretty stout springs.

is it possible i have the dampers assembled incorrectly? i followed the diagrams in the parts book.

john

VT

#4

Post by VT » Mon Aug 22, 2005 4:42 am

My repop forks clunked the other day, but my castellated fork stem screw wasn't tight, so the tree stem was side-bashing the top tree. It quit clunking after I tighten the nut with a piece of hex-stock.
We had a discussiion on this problem on the old board. The last word someone had was, "put more fork oil in them until they quit knocking". They already have 6 or 7 oz. in them, so try a few more oz's at a time. You can find that post over on the old site. Burn a copy of the pertinent info and paste it here if you'd like. 8)
Last edited by VT on Mon Aug 22, 2005 6:01 am, edited 2 times in total.

john HD
Moderator
Posts: 3677
Joined: Sat Aug 20, 2005 7:24 pm
Bikes: '42 WLA X 2, '55FL, '93 Ultra Classic, '91 Fatboy, '97 883, '71 Suzuki Duster 125, '83 GPz 750.
Has thanked: 52 times
Been thanked: 77 times

#5

Post by john HD » Mon Aug 22, 2005 5:16 am

thanks vt, i might try the extra oil trick.

john

john HD
Moderator
Posts: 3677
Joined: Sat Aug 20, 2005 7:24 pm
Bikes: '42 WLA X 2, '55FL, '93 Ultra Classic, '91 Fatboy, '97 883, '71 Suzuki Duster 125, '83 GPz 750.
Has thanked: 52 times
Been thanked: 77 times

update

#6

Post by john HD » Mon Aug 29, 2005 1:12 am

i added 2 oz of oil to each fork tube. seems a little better. still have a slight clunk.

might try one more oz.


john

john HD
Moderator
Posts: 3677
Joined: Sat Aug 20, 2005 7:24 pm
Bikes: '42 WLA X 2, '55FL, '93 Ultra Classic, '91 Fatboy, '97 883, '71 Suzuki Duster 125, '83 GPz 750.
Has thanked: 52 times
Been thanked: 77 times

#7

Post by john HD » Mon Sep 05, 2005 7:19 am

well the extra oil didn't help.

when i was at davenport i picked up a nice set of sliders. when i get some time i'll look into the fix further.

i got the sliders because the ones i have have had the fender tabs welded back on during my dechopping of the bike.

john

chucktx
Posts: 35
Joined: Sat Jan 22, 2005 9:16 am
Location: texas

#8

Post by chucktx » Tue Sep 06, 2005 2:46 am

keep us posted.....
chucktx

VT

#9

Post by VT » Tue Sep 06, 2005 4:44 am

I think I'd have the lower and upper bushings installed and Sunnen-honed. Some of that pounding might be the tubes racking back and forth in worn bushings. There's not a whole lot of parts in the forks that aren't under spring pressure of some sort. Bill's Cycles in PA replaces them. V-Twin does them. I think I'd rebuild them with the later '77 (Gary Bank) parts once you get them back. No felts. Fewer parts. I took my V-Twin forks apart and they use the '77 FX assembly. Careful when you install the damper tube. Make sure the flat shoulders of the end of the damper stud completely register in the square of the (knurled) damper washer. And, that the leading edge of damper shoulders stay recessed below the top surface of the knurled washer or the sliders will leak. I added four (large) paper damper bushing washers to keep the shoulders recessed. Worked. No leaks.
Last edited by VT on Thu Dec 28, 2006 2:57 am, edited 1 time in total.

john HD
Moderator
Posts: 3677
Joined: Sat Aug 20, 2005 7:24 pm
Bikes: '42 WLA X 2, '55FL, '93 Ultra Classic, '91 Fatboy, '97 883, '71 Suzuki Duster 125, '83 GPz 750.
Has thanked: 52 times
Been thanked: 77 times

#10

Post by john HD » Mon Nov 28, 2005 4:08 am

well, upon further review the two fork sliders i got at davenport wern't a matched pair.

one of them is from a later style fork...thats what i get for not looking close!

i guess i'll ebay the odd one, someone can use it!

rats!

john

stolfus

front end clunk

#11

Post by stolfus » Mon Dec 19, 2005 2:40 am

What are your tree bearings doing? Just a thought. :shock:

john HD
Moderator
Posts: 3677
Joined: Sat Aug 20, 2005 7:24 pm
Bikes: '42 WLA X 2, '55FL, '93 Ultra Classic, '91 Fatboy, '97 883, '71 Suzuki Duster 125, '83 GPz 750.
Has thanked: 52 times
Been thanked: 77 times

#12

Post by john HD » Tue Dec 27, 2005 2:04 am

thanks for the suggestion.

i'm convinced the noise is coming from the sliders topping out after a bump.

john

panwars

fork clunk

#13

Post by panwars » Sun Jan 01, 2006 2:26 am

I run an aftermarket set of tubes from J&P that with 7 oz of Harley fork oil clunked badly at top out (full extension) I switched to heavier oil, can't remember brand, Not Harley oil, and that almost cured it all. Then I dumped another oz in and all was silent. 8oz in each tube of heavier oil than stock, may do it. Hope this helps.

john HD
Moderator
Posts: 3677
Joined: Sat Aug 20, 2005 7:24 pm
Bikes: '42 WLA X 2, '55FL, '93 Ultra Classic, '91 Fatboy, '97 883, '71 Suzuki Duster 125, '83 GPz 750.
Has thanked: 52 times
Been thanked: 77 times

#14

Post by john HD » Wed Dec 27, 2006 11:24 pm

i finally got around to taking the forks apart today.

everything looks ok except the total lack of oil in the left slider! earlier when i mentioned i had added 2 oz more the left fork must have been dry.

upon closer inspection i suspect the gaskets at the bottom were leaking badly.

i get some pics and report back...

john

VT

#15

Post by VT » Thu Dec 28, 2006 5:58 am

Here's the fork from the '58-68 Parts Book that uses shim(s) #41 but no (46045-49) spring spacer, even though it was listed being used for 65 & 66 (possibly because the heavier weight of the Electra-Glide may have required it). The retaining ring #60 needs no more than 0.004" between it and the #56 lower bushing. Any more free play than that could cause slamming, but that's the only "free play" that's in the entire damper/fork spring assembly.
JohnHD thinks that the entire damper assembly #54 might be moving back and forth (racking) within the fork tube #50 and causing the slamming.
Any ideas :?:
Image

Post Reply

Return to “Forks/Shocks”