Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

JFab frame rails breaking

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Extreem:
I wonder if JFab is going the way of Stewart......
This post has been active over a month with no reply from him ???? 

jBernard:
as noted before, guy is super busy and i doubt he is ignoring this thread if he has seen it by any chance.

there are to many other factors to put blame on jfabs rails. yoke design, welding expertise, swingarm thru bolt squareness, head bracket design to frame, ect.
people bend aluminum tubing every day and put structural loads on it. jfab's rails arent bent with any crazy angle, so i'd be looking to other stresses as the culprit as of now.

sandblaster:
I'm with you jBernard.
As a business owner I know that responding to every potential complaint can be tedious and time consuming.
I'm certain that this thread has been on his mind but think about it this way.
What can he say that will prove or disprove the concerns raised here?
Have you ever heard of any of his frame conversions failing?
I haven't, but like many others I chose to try it myself because I was too cheap to pay for a first class job and I wanted to see if someone as inept as me could do it.
Remember he does not make the basic material.
All he does is cut it and bend it.
It is up to you to know what you are doing and do your own engineering (Not WAG engineering).
If you run a stress analysis on the material you will see that it is more then enough material to handle the load providing that the load is correctly divided on it's mounting points and providing the head stay is properly engineered.
From the pics I saw there are problems with that design.
I'm not sure that comparing this situation to that of Stewart is really relevant.
I'd like Stewart to sign up under a different name so he can provide his technical expertise but, I would not buy from him :-)
I will be doing another conversion after I get my current one done and I will buy another set from Jfab  :-o

Starky307:
I'm with Sandblaster, there was/is nothing wrong with the frame rails. It was the design of the headstay that caused that failure.

I don't know jfab nor have I ever had contact with him. I can't stand seeing an internet flaming or lynch mob in action when there is absolutely no need for it.

Can someone put this thread to bed, I think it is terrible that there are people trying to put blame towards the person who bent the rails and not that of the person who didn't know what they were doing when they made the head stay.

Rant over.

don46:
I wasn't going to post on this topic but in the end I see a good person being slammed. there was nothing wrong with the frame rails, there are many people on this site using them. What does that mean, it means that the installer failed to make a proper installation. What is it that those of you keep saying where is Jfab want him to say? he bent rails and the consumer installed them, so figure out what your problem is and fix it.  It is so easy to right away blame somebody else for our mistakes. I think that it is a matter of time and you will see more break, not because they are weak but improperly installed. I had a set fail (not Jfab's) and upon reflection I re-designed my installation and haven't had one problem (I did a 250 and a 500). Remember the 500 vibrates alot, how many have broken mounts on their steel framed bikes, so the AL will probably break as well unless you have a well balanced motor.

So lets stop asking where Jfab is and fix the underlying problem, and when you do let the rest of us know how you did it so we can re-enforce our designs.

have a good day!

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