Sub-Straightening?

PULLIAM
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PULLIAM
Edited Date/Time 1/27/2012 9:53am
My subframe has been bent for some time now, I was wondering if there is tips to bending er back, I am reluctant to atempt the procedure cuz I dont want to break the subframe and not be able to ride.
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newmann
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newmann 4/10/2009 7:29pm
4/10/2009 7:29pm Edited Date/Time 4/10/2009 7:30pm
If it's not bent too bad, it may not be too much of a problem. The subframe can be twisted on quite a bit. If you have an aluminum frame you need to be careful where the top of the subframe attaches to the frame. That section of most aluminum frames is cast and the weak point when you go the twist the subframe back straight. You don't want to break that. So, procede with caution.
typ2vw159
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typ2vw159 4/11/2009 7:45am
4/11/2009 7:45am
Take every thing off it bolt it back on (bare sub frame )and wac it with aplastic milk crate a few times and you will be close
partialperson
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partialperson 4/11/2009 8:02am
4/11/2009 8:02am
Milk crates are in short supply around here. I've had good luck with a plastic deadblow hammer also, the kind with the lead BB's in it. Ask me how I know it's lead BB's.
kaw rider9
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kaw rider9 4/11/2009 8:38am
4/11/2009 8:38am
partialperson wrote:
Milk crates are in short supply around here. I've had good luck with a plastic deadblow hammer also, the kind with the lead BB's in it...
Milk crates are in short supply around here. I've had good luck with a plastic deadblow hammer also, the kind with the lead BB's in it. Ask me how I know it's lead BB's.
You tasted the BB's?

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bmoto816
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bmoto816 4/12/2009 7:40am
4/12/2009 7:40am
I bent the one on my CRF450 (06'), and I used a pipe bender that I bought from home depot. just go slow and do it a little at a time. straightened mine out just great and never had any problems.

CamP
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CamP 4/12/2009 11:10am
4/12/2009 11:10am
I borrow a 6 foot long, 1" thick steel rebar from my neighbor. Straitens mangled subframes with ease.
newmann
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newmann 4/12/2009 11:16am
4/12/2009 11:16am
CamP wrote:
I borrow a 6 foot long, 1" thick steel rebar from my neighbor. Straitens mangled subframes with ease.
See my comment about breaking the mounting tabs on the frame! Not confessing to anything though!!Shocked
slowvet
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slowvet 4/12/2009 12:01pm
4/12/2009 12:01pm
I straightened my sons crf250 subframe with hickey bars. However a straight length of pipe 2" diameter with blocks of wood you can do the same thing. Leverage the pipe against the subframe with the wood while the subframe is still attatched to the frame. CamP has the right idea.
CamP
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CamP 4/12/2009 12:02pm
4/12/2009 12:02pm
CamP wrote:
I borrow a 6 foot long, 1" thick steel rebar from my neighbor. Straitens mangled subframes with ease.
newmann wrote:
See my comment about breaking the mounting tabs on the frame! Not confessing to anything though!!Shocked
That would be a bummer. Good thing used frames sell for less than new subframes on ebay. Wink
CamP
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CamP 4/12/2009 12:08pm
4/12/2009 12:08pm
BTW, I remove the airbox, the muffler and all the plastic, then remount the subframe back on the bike with the mounting bolts just hand tight before straitening.
AMA714
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AMA714 4/13/2009 9:32am
4/13/2009 9:32am
If you are at the track and it is just a little tweaked... you lay the bike on its side with a milk crate, log or whatever you can find under the sub frame, bent side down. Don't forget to put a rag or something under your grip to keep mud/sand out of throttle tube if laying it on that side.

While the bike is down you stand on the main frame spar (center of bike) and jumped lightly up and down. You would be surprised how good you can get the sub frame back where it belongs.

Looks a little unconventional to be jumping on your bike but it works. My CRF was bent pretty good and I had it straight in 5 minutes
Tiki
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Tiki 4/13/2009 9:36am
4/13/2009 9:36am
I have used a 1x1 wood beam. Using the same above.
lumpy790
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lumpy790 4/13/2009 10:59am
4/13/2009 10:59am Edited Date/Time 4/13/2009 11:01am
this has worked for me a few times .......Lay the bike on its side with the handlebar end resting on your bike stand and jump up and down (moving it in the proper direction) at the side panel seat area till it tweaks back.

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