Subframe modification/replacement

Fourth_Floor

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72
Location
Pennsylvania
#1
Anyone have any info about changing the subframe over to a KTM subframe? I seen someone on here do it and was curious what year and model KTM subframe to get and what all modifications you need to make to it? Those little brass insert things are ripping out of my rear fender and would much rather just do away with all that and make sourcing plastic easier when I need a rear fender or side panels.
 

snydes

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2,111
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Pennsylvania
#2
One of our members had a custom built subframe that uses a KTM rear fender and a modified seat pan that uses the back half of a KTM seat and the front half of the Alta seat. The seat pan for me it the biggest hiccup, building the subframe wouldn't be that hard. In case you hadn't already seen it, there are a few brass insert repair ideas in this thread;
Little brass thread inserts in plastic -- How to fix
Those darn inserts are in my mind the biggest annoyance of these bikes, which in the big picture isn't that bad, but annoying they most certainly are.
 

F451

Well-known member
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519
Location
Seattle
#8
I do not. My best guess is they took the two halves and maybe used some form of a splice plate to overlap on the foam side.
That doesn't sound like it would be too hard to do, use some heavy duty 2 part epoxy.

And I thought I read somewhere here that someone used a KTM subframe and seat and that front of the KTM seat mounts matched up with the Alta mounts. Does anyone else recall that or am I imagining it?
 

snydes

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Pennsylvania
#10
That doesn't sound like it would be too hard to do, use some heavy duty 2 part epoxy.

And I thought I read somewhere here that someone used a KTM subframe and seat and that front of the KTM seat mounts matched up with the Alta mounts. Does anyone else recall that or am I imagining it?
Here’s the post;
MXR 2019 won't turn on
 

Jmazz274

New member
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4
Location
Salzburg
#11
Mat’s is a custom welded tube rear subframe (I think titanium), running 07 Honda 2stroke side boards and rear fender. Seat base from what I remember is fused/joined bases (Alta front, CR rear... Mat can correct me if I’m wrong)... his dad Antoine created it, he’s a real perfectionist when it comes to those finer details.
 

Fourth_Floor

Well-known member
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72
Location
Pennsylvania
#12
Mat’s is a custom welded tube rear subframe (I think titanium), running 07 Honda 2stroke side boards and rear fender. Seat base from what I remember is fused/joined bases (Alta front, CR rear... Mat can correct me if I’m wrong)... his dad Antoine created it, he’s a real perfectionist when it comes to those finer details.
Thank you for the info!!
 

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