Bent subframe on MX bike

**Stylo** · 18th February 2016, 16:17

I've got a rear sub-frame of a KX500 that is quite badly bent, all in one piece just needs straightening, not cracked at all.

Everything hangs on it or under it, seat, muffler - like a big triangle on both sides you know how it goes ..

Don't have the tools to do it myself. Is there someone who could do this if I took the bike in ? I live in CHCH.

**Crasherfromwayback** · 18th February 2016, 16:57

Originally Posted by Stylo

I've got a rear sub-frame of a KX500 that is quite badly bent, all in one piece just needs straightening, not cracked at all.

Everything hangs on it or under it, seat, muffler - like a big triangle on both sides you know how it goes ..

Don't have the tools to do it myself. Is there someone who could do this if I took the bike in ? I live in CHCH.

It's actually quite easy to do yourself. Strip all the bits off (sidepanels, muffler, seat etc etc), lie bike on its side...big bar through the subframe...bend away.

**Stylo** · 18th February 2016, 17:19

Originally Posted by Crasherfromwayback

It's actually quite easy to do yourself. Strip all the bits off (sidepanels, muffler, seat etc etc), lie bike on its side...big bar through the subframe...bend away.

Problem is it looks like this one has landed on the r/h side rear end so, that side has been pushed forward so it's actually bulging outwards on the muffler side as well as being twisted. The air box is now completely out of square.

I guess new parts are out of the window seeing they stopped making the bike 12 years ago ..hmmm

**Crasherfromwayback** · 18th February 2016, 17:59

Originally Posted by Stylo

Problem is it looks like this one has landed on the r/h side rear end so, that side has been pushed forward so it's actually bulging outwards on the muffler side as well as being twisted. The air box is now completely out of square.

I guess new parts are out of the window seeing they stopped making the bike 12 years ago ..hmmm

Still no problem. Post a pic, and I'll describe where to put the bar etc.

**F5 Dave** · 18th February 2016, 21:37

I got a wrecking bar from bunnings for not that much. Its totally straight about 2M long with a flat chisel point at one end. So much leverage that you can do some subtle things. The flat is kinder on the tubes, but some ally can spread the load.

Worst case cut out irreparably damaged tube and weld in a new section after the rest is straight.

**Stylo** · 19th February 2016, 07:12

Here we go ...

**F5 Dave** · 19th February 2016, 07:48

. . . shhika shhika shhika. . .

. . . bbzzzzzz. bbzzzzz.

**flashg** · 19th February 2016, 08:16

Is it removable ? If so, take it off and get someone to do it. Take some measurements of the anchor points, to give them a reference. Any small engineering company could straighten it as long as they have a tig to weld any cracks that might appear. Good luck.

**Crasherfromwayback** · 19th February 2016, 11:02

Originally Posted by Stylo

Here we go ...

Ummmmm...that's actually fucked! How did ya do that? We could straighten it, but you may fuck it doing so. May be cheaper to find one on Ebay.

**Stylo** · 19th February 2016, 15:42

Originally Posted by Crasherfromwayback

Ummmmm...that's actually fucked! How did ya do that? We could straighten it, but you may fuck it doing so. May be cheaper to find one on Ebay.

Yeah I'll explore the getting fixed option before I look at E-bay etc. Think my chances of finding another one anywhere will be pretty slim though.

How did I do it ? Throttle jammed on full in 4th, you can guess the rest ....

**Stylo** · 19th February 2016, 16:43

Another pic .....

**flashg** · 19th February 2016, 16:58

Can't see a better angle of that sub frame. Not a fan of those two piece handlebars though.
Are you ok Mark ? Hope you bailed in time

**Stylo** · 19th February 2016, 17:30

Originally Posted by flashg

Can't see a better angle of that sub frame. Not a fan of those two piece handlebars though.
Are you ok Mark ? Hope you bailed in time

Everything's fixable thanks Flash, no time to bail the wheel came up as I realised my throttle wouldn't respond to the off command.

Bike decided it didn't need me anymore so I was dumped at a good rate of knots. I'm now on ACC for a little while .....

**flashg** · 19th February 2016, 17:45

Originally Posted by Stylo

Everything's fixable thanks Flash, no time to bail the wheel came up as I realised my throttle wouldn't respond to the off command.

Bike decided it didn't need me anymore so I was dumped at a good rate of knots. I'm now on ACC for a little while .....

All true about things being fixable.
I hope you mend well and quickly.
My time on ACC is over, I got the all clear, knee is 100%. Back to work Monday