Maintenance & Technical > KX500 Aluminum Frame Conversion (AFC)

Frame question for a 250af build

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motopunk:

--- Quote from: funke93 on January 30, 2015, 05:33:15 PM ---Yes, I read No1clyde's post on the tran's swap very detailed I guess I just missed the part where the kdx250 tran's is only a 5 speed, and just assumed since it was a kdx that it had 6 speeds? Why do people do this swap then more woods friendly? Why don't they just take the shorter first gear from the 94-96? Kx250 don't quote me on those years haha

--- End quote ---

funke93  the kdx200/220 motors are based on the kx125 motors . directly interchangeability of the complete trannys to the 250 engines are not impossible but why do this? kdx250 trannys would fit better to the kx250 . here you can find some more infos that you looking for.  www.cmsnl.com

don46:
I didn't mean to imply that the KYB stuff was terrible, because it can be made really good also. you can find 250f Showa components  pretty cheap on ebay the 08 09 and 10  are really good in 11 I believe they went to the sff, I guess for a 250 that would work fine as well, don't hink I'd use it on a 500 though. Having ridden both the 250f and the 450f, i would go with the 250f chassis because it feels smaller and more nimble, even though you would have mmore room, why. refresh my memory is the headstay in the front or back on your motor, I'm remembering the front whic should eliminate any plug to tank issues, heck Service HOnda is using the 250f chassis for their 500's so there is plenty of room.

funke93:
Motopunk punk thanks for the site! Never even heard or it didn't really get much time to play with it but it looks like I can cross reference part # with different model bikes? Why wouldn't you want a 6 speed tranny in a kx250?! (; and yes don my motor is supposed to have the head stay in the front I think in 03 they switched it (I don't have the head or cylinder yet), but aren't the heads from the 99-02 motor interchangeable with the 03+ motor? Also for frames they all are aluminum from 07 to present is there any particular year that stands out ( kinda like the 08 crf250 frame where they got the hpsd as an example)

motopunk:

--- Quote from: funke93 on January 31, 2015, 02:04:48 AM ---Motopunk punk thanks for the site! Never even heard or it didn't really get much time to play with it but it looks like I can cross reference part # with different model bikes? Why wouldn't you want a 6 speed tranny in a kx250?! (; and yes don my motor is supposed to have the head stay in the front I think in 03 they switched it (I don't have the head or cylinder yet), but aren't the heads from the 99-02 motor interchangeable with the 03+ motor? Also for frames they all are aluminum from 07 to present is there any particular year that stands out ( kinda like the 08 crf250 frame where they got the hpsd as an example)

--- End quote ---

yes same numbers are the same unchanged part in every bike... 

why i dont want a 6 speed-tranny in a kx? i personally dont need it for my riding ... what i tried to say was the possible easier interchangeability..  :wink:

kx 250 heads are interchangeable from 93-2004 ... 93 is the paralell cooling system with 2 small tubes on the top, that will not fit to your needs...  94-2002 is with front mounting .. 2003-04 with backmounts

funke93:
Ok so here's the combo I think I'm going to use I have 99-02 cases with the 03 head, 94 cylinder with 94 pv, cdi and stator, and a 94-98 kx250 1st 2nd followed but an 02 3rd 4th and 5th. This is mostly going to be a trail machine with a touch of track riding here and there. Tell me if you guys would do anything different 9oz FWW?

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