KXF 250 2007 for KX500AF

[Dutch-K5 Fan]

Is a Kxf250 from 2007 a good frame to start with for building a KX500AF
I can get a kxf without engine for ?1450,- and a 88 engine witch is in parts for ?150,-
Sould I take the change??? Or is this a difficult frame/engine combo to go with???



Dutchie

[jfabmotorsports.com]

Dutch...Are you going to be doing this yourself? '89-04 engines are all the same. If you ever need parts its something to think about. e-mail me if you would like to see my build pics.

[AJ]

The 250F chassis is more difficult that the 450F..
quite a few more hurdles to overcome as the frame is just smaller than the engine you're trying to put into it.. 
but yes, it is possible.
 
 to make thinks considerbaly easier,, I'd look for a 450F as a start to the project...

[Dutch-K5 Fan]

I'm gona build it my self, only haven't welded aluminum before. That I
led some one else do. I'm a Agriculture mechenic/ maschine builder.
What about the 250f airboot? Does it fit a K5 (pwk39 if i'm correct) carb???
Or should I use a 250 2stroke piece?

I hope to take a looke at the frame thursday, and donor bike on saterday
if the frame is in good shape. It should have everything exept the engine, ignition and card.


Dutchie

[don46]

As for the frame I would take AJ's advice and use the 450 frame, there is a bit more clearance front to back than the 250f chassis.  As for the motor, the 88 motor is a real powerhouse, but, it uses the old style KIPS system and the drums  and shaft are obsolete. I have an 88 cylinder and head that the valves were stripped when trying to buy new from Kawi I was told un available. with some effort you could modify the cases to accept the newer 89-04 cylinder, not sure it would be worth it, or get a set of 89-04 cases and transplant the 88 parts into them. I think AJ is using a honda 250 2t air boot, I used a 99-02 kawi airboot, it had the best angle. The stock 250f/450f airboot will not work it is way to small.

[Dutch-K5 Fan]

As long I don't have to cut the lower frame tubes, i'm not afraid
The 88 engine is gone, I'm gonna go to a Kx dealer who hase 4 or 5 K5's.
From 97 to 01, so I buy a complete donor bike and airboot now. Thanks DON!!!!
The 205f frame is "cheap" compared to a 450. Saves about ?2000,- For that
I'll take the extra work. As long I don't have to cut the lower frame tubes, i'm not afraid

Dutchie

[AJ]

Dutchie,,

Thank you for the PM.

For some reason i can read PMs'
 but when i reply, it does not work.
sorry.
(and your english is fine, and much MUCH better than my Dutch )


On that 250F frame,
the
250F engine is not as long as a KX450 or KX500 engine ,
and so the 250F frame is much shorter in the engine cradle area.

since the KX500 engine simply  longer than that frame ,,
uyou woul need to cut the front of the tubes away completely and remake that area.

for this reason, i would suggest if building your own bike,
 to start with a 450f chassis,
it will also need a lot of frame work..
but it is fundamentally long enough for the engine, so makes things easier?

[Dutch-K5 Fan]

Thanks for "worning" me
Else I would have a BIG fight with the Mrs.(girlfriend)

And AJ you can speak Dutch.

Kawasaki     = Kawasaki
E-mail         = E-mail
video          = video
lamp           = lamp           


Thanks AJ


Dutchie

[jfabmotorsports.com]

Dutch...You do have to cut the lower tubes or cradle. Some builders cut them just before they turn inward and then add the amount needed to extend them to the now shorter down tube. The stock lower mount will not work. The front mount will not work.  I build completely new cradles to replace the old ones. The end result is a clean factory look. If you need a closer look e-mail me.

[BDI]

Holly s**t some one pick me up off the floor  some one who will show their craftsmanship. Thank you

[jfabmotorsports.com]

BDI....You are welcome.

[GDubb]

Wow... looks better than the factory piece you cut off. Nice clean work.


-G

[Dutch-K5 Fan]

Ok? I've don some research now about aluminum in holand.
Whanted to now the cost and work. Cost is oke, work achievable .
Whant to do the welds my self, only bending the squire tubes would be difficult.
Any Idea's    Could find 6060 T6 Alu and no 6061 T6. Big differense?
Some people say that if I weld on a alu frame it gets les stong near the welds. For about 30% to 80% according to
what I've found on the internet.

Still I'm looking to start with and share it here!!!!!!!


Dutchie

[jfabmotorsports.com]

Dutchie....There are many ways to "skin a cat" My way is most certainly one of the hardest, having to hunt the right tube and then bend it. In this photo, the solution is easy to see. Just add about 3 inches. I DID NOT HAVE ANYTHING TO DO WITH ANY WORK ON THIS FRAME No matter what path you take you still have to cut somewhere and then weld it back.

[Dutch-K5 Fan]

Today I went to get the 07 frame. Looks great
First I'm gone clean and prepair my old 04 rmz to sell it. Than start to
take the alu frame and the K5 apart. And to take a look how to squise the engine in the alu frame.
Look forword to it.

Dutch