Maintenance & Technical > KX250 / KX125

1990 KX250 swingarm issue

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Eric618:
Hey all,

I bought a '90 KX250 as a project bike to tear down and restore.  It was fully assembled when I got it. I tore it all down, cleaned, replaced anything necessary and am now starting to reassemble. Problem is, I can't get the swingarm back on. It will not fit back between the frame and bracket on the brake side.  The chain side fits fine. For the freaking life of me I can't figure out why.  It's just too tight to fit by 1-2mm.  Again, it was assembled when I got it, so it's clearly user error.  Any ideas??  Thanks in advance!!

GCrites80s:

--- Quote from: Eric618 on January 19, 2025, 02:47:54 AM ---Hey all,

I bought a '90 KX250 as a project bike to tear down and restore.  It was fully assembled when I got it. I tore it all down, cleaned, replaced anything necessary and am now starting to reassemble. Problem is, I can't get the swingarm back on. It will not fit back between the frame and bracket on the brake side.  The chain side fits fine. For the freaking life of me I can't figure out why.  It's just too tight to fit by 1-2mm.  Again, it was assembled when I got it, so it's clearly user error.  Any ideas??  Thanks in advance!!

--- End quote ---

At this point I'd get a pike and pry the framerails back apart!

wingrider101+:
 Some pictures of the Swing arm - with bearings installed might help us see what's going on there.
Also some pictures of the assembly as you are trying to install it--- Like, show what doesn't fit and where.

 I believe the swing arm assembly needs to be fitted near Exactly square/parallel with the frame/mounting bolt holes.. slightly crooked and it won't fit.

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