BUILDING A KX500AF with a 2007 KX250F chassis
- Sandblaster
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Re: BUILDING A KX500AF with a 2007 KX250F chassis
The head stay made it in today:
Now I can start making all the mounting brackets and get them welded on.
Now I can start making all the mounting brackets and get them welded on.
If bikes are for kids I'll never grow up.
- Sandblaster
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Re: BUILDING A KX500AF with a 2007 KX250F chassis
Any guesses as to what this is for?
If my idea works I'll post details later
If my idea works I'll post details later
If bikes are for kids I'll never grow up.
- Sandblaster
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Re: BUILDING A KX500AF with a 2007 KX250F chassis
I'm also working on removable motor mounts.
Most guys weld the motor mounts directly to the frame.
However, using a KX250F frame limits the amount of space you are working with.
So, I will drill through the frame tubes and weld in aluminum tubing.
This will give the strongest mounting points and allow the mounts to be easily removed which will make engine removal a lot easier for future upgrades
It will be a little harder to do but I feel it's worth the effort.
Most guys weld the motor mounts directly to the frame.
However, using a KX250F frame limits the amount of space you are working with.
So, I will drill through the frame tubes and weld in aluminum tubing.
This will give the strongest mounting points and allow the mounts to be easily removed which will make engine removal a lot easier for future upgrades
It will be a little harder to do but I feel it's worth the effort.
If bikes are for kids I'll never grow up.
- Sandblaster
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Re: BUILDING A KX500AF with a 2007 KX250F chassis
Here's another pic with a little more details:
If bikes are for kids I'll never grow up.
- Sandblaster
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Re: BUILDING A KX500AF with a 2007 KX250F chassis
I have the aluminum mount made.
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If bikes are for kids I'll never grow up.
- Sandblaster
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Re: BUILDING A KX500AF with a 2007 KX250F chassis
I had considered a slightly different design but decided in favor of the design above:
If bikes are for kids I'll never grow up.
- Sandblaster
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Re: BUILDING A KX500AF with a 2007 KX250F chassis
Because a few people had problems breaking their frame rails I wanted to be sure I understood where the transfer of energy was taking place at.
Here is a rough diagram of where the mounting points are in relation to the frame.
As you can see, when coming down hard on a jump the force is transferred in a radial motion.
So, the rear mounts must be in line as much as possible with the direction of the force.
Further, having the front mount on the head helps to stop any force that is trying to be transferred to the frame rails.
Here is some pics of the different views.
Nothing is welded yet but you get the idea:
That's my story and I'm sticking to it for now
Here is a rough diagram of where the mounting points are in relation to the frame.
As you can see, when coming down hard on a jump the force is transferred in a radial motion.
So, the rear mounts must be in line as much as possible with the direction of the force.
Further, having the front mount on the head helps to stop any force that is trying to be transferred to the frame rails.
Here is some pics of the different views.
Nothing is welded yet but you get the idea:
That's my story and I'm sticking to it for now
If bikes are for kids I'll never grow up.
Re: BUILDING A KX500AF with a 2007 KX250F chassis
Very nice. I can see why people had problems with the frame rails. By the way, love the cad drawings. Put that degree to work !
- Sandblaster
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- Location: Eugene, OR
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Re: BUILDING A KX500AF with a 2007 KX250F chassis
Yeah I thought about doing the whole engine in CAD but in reality I just wanted to visualize the problem without all the pieces in the way.
Once that was done it was a lot easier to see why others had trouble.
Their top mounts are hanging down perpendicular to the arc.
In essence they made a big lever that their engine pulls against
I wouldn't do it that way but what do I know...
I guess we'll see when my test pilot gets a little flight time logged
Once that was done it was a lot easier to see why others had trouble.
Their top mounts are hanging down perpendicular to the arc.
In essence they made a big lever that their engine pulls against
I wouldn't do it that way but what do I know...
I guess we'll see when my test pilot gets a little flight time logged
If bikes are for kids I'll never grow up.
- Sandblaster
- Posts: 6313
- Joined: Thu Jun 07, 2012 3:50 pm
- Location: Eugene, OR
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Re: BUILDING A KX500AF with a 2007 KX250F chassis
I finally got the engine mounts done.
It's amazing how long this stuff takes when you don't have the proper tools
The front and lower mounts came out exactly as I planned in that they would be exactly the same size as each other.
The top mounts are completely different as you would expect.
Try that when you are cutting out the original carriage that they all mounted too and try to fab and weld something completely new.
Yeah, I got lucky
The only change was on the lower left side of the engine there is a protuberance that requires the mount to be slightly machined for clearance.
It's all good as I was able to make them all the same, drill them, and then machine one of them to fit.
It's amazing how long this stuff takes when you don't have the proper tools
The front and lower mounts came out exactly as I planned in that they would be exactly the same size as each other.
The top mounts are completely different as you would expect.
Try that when you are cutting out the original carriage that they all mounted too and try to fab and weld something completely new.
Yeah, I got lucky
The only change was on the lower left side of the engine there is a protuberance that requires the mount to be slightly machined for clearance.
It's all good as I was able to make them all the same, drill them, and then machine one of them to fit.
If bikes are for kids I'll never grow up.
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