How much is too much bend in fork tubes? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
Maintenance How-to WARNING! If you follow these posts and something goes wrong - Stromtroopers is not responsible for any damages, etc. You assume all risk.

 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 06-17-2015, 07:40 PM Thread Starter
Stromthusiast!
 
Join Date: Jun 2010
Location: Truth or Consequences, NM
Posts: 0
How much is too much bend in fork tubes?

I had not ridden for a while as I had new knees installed (good job at UNM) so when I fired up and went down the road, I was looking for surprises. Fork oil coming out!! OK, need new seals. 28 K on the bike, a K2, so not unusual. Pulled the forks and put then in the vise and turned the tubes to see if straight. The right was 3/8 inch out of true and the left 1/4 inch. Not the original owner so not surprised. I had the forks off when working on the front of the bike before my new knees so I probably put them in with the bends not in line as before which would explain that new high speed wobble. We used the pipe bender to straighten out our dirt bike fork tubes all the time, but I am usually going twice as fast now. Just how much bend is safe if I get them lined up to reduce that wobble? Will the old pipe bender trick straighten them enough to be safe? Pick up some used ones? Any thoughts?
quantum.lizard is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 06-17-2015, 08:14 PM
Super Moderator
 
Brockie's Avatar
 
Join Date: Jul 2013
Location: Gatton, Queensland, Australia
Posts: 4,293
Garage
That is quite a bend and I would have to guess that the bends are just below the lower triple clamp, in which case someone has rammed into the back of a stopped car or similar. Unless you are strapped for a buck I would replace them for the sake of my peace of mind.

2010 Weestrom; 2017 Kawasaki Versys-X300; 1988 Suzuki GSXR1100
Brockie is offline  
post #3 of 7 Old 06-17-2015, 08:40 PM
Stromthusiast!
 
Nostromdumbass's Avatar
 
Join Date: Dec 2013
Location: SEKY
Posts: 351
put them in the v-blocks and use the hydraulic press to straighten them. Install and ride straight. No worries as long as the upper and lower clamps are true. Not badly bent IMHO. Should be totally correctable. I've straightened much worse.

An original quote by Nostromdumbass;

Facebook: making humanity yearn for the times when people used to talk behind others backs.
Nostromdumbass is offline  
 
post #4 of 7 Old 06-17-2015, 08:42 PM
Stromthusiast!
 
Nostromdumbass's Avatar
 
Join Date: Dec 2013
Location: SEKY
Posts: 351
on high performance street bikes...BTW. Much harder to do on the perverted forks more modern sport bikes are fitted with.

An original quote by Nostromdumbass;

Facebook: making humanity yearn for the times when people used to talk behind others backs.
Nostromdumbass is offline  
post #5 of 7 Old 06-19-2015, 02:37 PM Thread Starter
Stromthusiast!
 
Join Date: Jun 2010
Location: Truth or Consequences, NM
Posts: 0
OK, got them all apart and when rolled on a true surface it looks like the bends are a little under 1/4 inch on the right and little under 1/8 on the left. OEM is $342.00 US, each!! I am just going to mark the high spot on each and put it to the rear when reinstalling, that way I am all set up for the next bump. My neighbor said that is what he and his buddies did when racing dirt bikes because it is just too difficult to bend them re-straight when it is so little. Might even scratch or put a flat spot, too, which would screw up the seals.
Thanks.
quantum.lizard is offline  
post #6 of 7 Old 07-15-2015, 06:05 AM
Stromthusiast!
 
Join Date: Dec 2005
Location: Gold Coast, Australia
Posts: 3,639
Quote:
Originally Posted by quantum.lizard View Post
OK, got them all apart and when rolled on a true surface it looks like the bends are a little under 1/4 inch on the right and little under 1/8 on the left. OEM is $342.00 US, each!! I am just going to mark the high spot on each and put it to the rear when reinstalling, that way I am all set up for the next bump. My neighbor said that is what he and his buddies did when racing dirt bikes because it is just too difficult to bend them re-straight when it is so little. Might even scratch or put a flat spot, too, which would screw up the seals.
Thanks.
There will be places that can retrue forks.

Last time I had it done was near 25 years ago, but provided they don't have creases it works just fine.

Pete
PeteW is offline  
post #7 of 7 Old 07-15-2015, 08:23 AM
Stromthusiast!
 
Nostromdumbass's Avatar
 
Join Date: Dec 2013
Location: SEKY
Posts: 351
Quote:
Originally Posted by PeteW View Post
There will be places that can retrue forks.

Last time I had it done was near 25 years ago, but provided they don't have creases it works just fine.

Pete
There is a strong possibility that the tree/clamps have been warped and should definitely be checked too. If there is a crease in either leg, you can bet on it.

The forks can be straightened by a machine shop or anyone with a hydraulic press and v blocks as long as there is no crease. There is an animated gif on this page showing some of the straightening steps.

Motorcycle fork tube repair

An original quote by Nostromdumbass;

Facebook: making humanity yearn for the times when people used to talk behind others backs.

Last edited by Nostromdumbass; 07-15-2015 at 08:49 AM.
Nostromdumbass is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome