Need to straighten fork tubes

DAMN maintenance and repair thread; including Farkle Fests! :boohoo:
Post Reply
User avatar
phoo
aka "That Guy"
Posts: 2157
Joined: Wed Sep 08, 2010 11:38 am
Contact:

Need to straighten fork tubes

Post by phoo » Thu Apr 17, 2014 1:13 pm

Where is the best local place to go to get fork tubes straightened? Typical scenario -- take the forks off to replace the seals and discover they're bent and probably have been since 2004. Maybe that's why the steering is so quick. :)

2001 Suzuki SV650 -- traditional forks, 41mm diameter tubes.


Thanks,

~Patrick
2003 Triumph Sprint ST :: 2004 Suzuki SV650R
2016 Beta 300RR :: 2006 Suzuki DRZ400SM
1975 Harley FXE1200

User avatar
Boom Boom
DAMN Grand Poohba
Posts: 3330
Joined: Wed Aug 26, 2009 7:26 am
Contact:

Re: Need to straighten fork tubes

Post by Boom Boom » Thu Apr 17, 2014 2:06 pm

Would think you just buy new tubes???
You have a couple stoppies go wrong?
2022 TRS 300 E-start

2021 Beta 300rr

User avatar
Rut Row
Benevolent Dictator
Posts: 9763
Joined: Sat Mar 08, 2008 3:39 am
Contact:

Re: Need to straighten fork tubes

Post by Rut Row » Thu Apr 17, 2014 2:19 pm

how about turning them around and do more stoppies?
Ken
Die young as late as possible, remember who you were before the world told you how it should be. -- Barry Morris

User avatar
Longboardr
DAMN Expert
Posts: 314
Joined: Sun Mar 11, 2012 7:27 am
Contact:

Re: Need to straighten fork tubes

Post by Longboardr » Thu Apr 17, 2014 5:11 pm

I have a friend that used to do it, supported the tube in V blocks and used a press if I understood correctly, he's retired now though.

Are you certain they're bent? They can be checked by spinning them in V blocks while checked with a dial indicator. You could also have a problem with bronze bushings inside the fork tube that is a wear item. When they wear the tube is no longer held quite straight relative to the seal, the seal can't compensate and become elliptical so the seal leaks.
Last edited by Longboardr on Thu Apr 17, 2014 5:23 pm, edited 1 time in total.

BillyGoat
DAMN Expert
Posts: 389
Joined: Fri Feb 25, 2011 12:01 pm
Contact:

Re: Need to straighten fork tubes

Post by BillyGoat » Thu Apr 17, 2014 5:16 pm

bending them once, then twice in the reverse direction may just overly weaken them. Would you care if your front end fell off when while you are riding?
KTM 450 EXC mostly
Member AMA, PaTRA, MD OHV Alliance, trying to join R&T

motojunky
DAMN Poohba
Posts: 610
Joined: Mon Nov 24, 2008 8:07 pm
Contact:

Re: Need to straighten fork tubes

Post by motojunky » Thu Apr 17, 2014 6:51 pm

I understand that it's actually not very tough using a press and v-blocks. I have not tried it myself, but a good friend who I used to race with did a set for me. They worked just fine and never fell off. :ride:
old dual sported XR250R
scorpa SY250 trials
some other crap

User avatar
phoo
aka "That Guy"
Posts: 2157
Joined: Wed Sep 08, 2010 11:38 am
Contact:

Re: Need to straighten fork tubes

Post by phoo » Thu Apr 17, 2014 9:27 pm

I've had forks straightened without issue. These aren't too bad, but the one was bent enough to be obvious even before rolling it on a flat surface.

The forks were previously on my race bike. They *may* have had more than just a stoppie go wrong. =)

I dropped them off at a shop today, hopefully I'll get them back by Saturday.


Thanks,

Patrick
2003 Triumph Sprint ST :: 2004 Suzuki SV650R
2016 Beta 300RR :: 2006 Suzuki DRZ400SM
1975 Harley FXE1200

User avatar
phoo
aka "That Guy"
Posts: 2157
Joined: Wed Sep 08, 2010 11:38 am
Contact:

Re: Need to straighten fork tubes

Post by phoo » Thu Apr 17, 2014 9:28 pm

Oh, and I was in the middle of a fork seal replacement, so the tube was all by itself and made inspection easy and foolproof. :-)


Thanks,

Patrick
2003 Triumph Sprint ST :: 2004 Suzuki SV650R
2016 Beta 300RR :: 2006 Suzuki DRZ400SM
1975 Harley FXE1200

Post Reply

Who is online

Users browsing this forum: No registered users and 13 guests