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Author Topic: Newbie building an 06 KX450f with 93 KX250 engine  (Read 10130 times)

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Offline A.Frame187

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Newbie building an 06 KX450f with 93 KX250 engine
« on: May 14, 2015, 02:37:28 AM »
Just signed up today. I have this bike I'm building, I bought it already started and am trying to figure out carb/airbox connection.. Does anyone have any insite on it? Obviously its been done plenty of times.. The top of the carb is even with the bottom of the airbox boot.
Any help would be greatly appreciated. I've done many snowmobile power transplants, but this is my first bike.
I'm sure I'll have other questions along the way..
Thanks Aaron
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Offline umberto

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #1 on: May 14, 2015, 03:10:23 AM »
Can you post some pictures of what you are working with?  If you've never done it, here is a step by step guide on posting using Photobucket which is free to use.

http://www.kxriders.com/forums/index.php/topic,10040.0.html
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Perhaps I have a dirt bike addiction?

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Offline sandblaster

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #2 on: May 14, 2015, 06:38:10 AM »
Hey A.Frame187, welcome to the forum.
I've played around with several boots and I have decided on a 2000 CR250 air box boot for my conversion.
It is shown on the right side of the pic.



The boot will have KZ3T on the side of it.
A lot of sellers mix them up.

You will need to make an aluminum adapter for it.
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline A.Frame187

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #3 on: May 14, 2015, 11:33:08 PM »
[/img]

Hope this works. That 2000 cr boot may be the option I need Sandblaster. What front pipe are you using on your bike?

Thanks for the help guys.
« Last Edit: May 14, 2015, 11:44:32 PM by A.Frame187 »
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Offline sandblaster

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #4 on: May 15, 2015, 03:23:06 AM »
Hmmmm.... mine doesn't fit like that.
I need to take a double look at mine later today.
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline scooterVOOII

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #5 on: May 16, 2015, 01:08:12 PM »
Sandblaster, yours doesn't look like that, because that's the 4-stroke airboot on that bike, in that last pic. Need the proper one, plus the adapter plate to make it work. Although, if you're Fanelli, you just use "s**tter pipe" to connect the carb and boot, the way they are now. Lol
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Offline A.Frame187

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #6 on: May 17, 2015, 11:40:27 PM »
I found a blown up 02 kx250 that I could probably own for $500.. Do you think that airbox boot would work? I guess I'd have to check to be sure.
Are the motor mounting points the same from a 93 to an 02? I've heard yes and I've heard no..  I figure if I get that blown up one is just a top end, I can get that motor rebuilt and eventually swap that in.
I also need to figure out an exhaust. I have nothing as of now. That blown bike just has stock, but it will give me something to start with.
Thanks again guys.
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Offline A.Frame187

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #7 on: May 19, 2015, 11:10:45 PM »
I bought a airbox off a 94 kx250 on eBay for $16 shipped. So I figured that would be a cheap test
« Last Edit: May 20, 2015, 12:06:19 AM by A.Frame187 »
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Offline A.Frame187

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #8 on: May 25, 2015, 03:21:45 AM »
So the 94 air boot doesn't look like it will work... It is too big to fit between the shock and the frame.. The shock will wear thru it. Sandblaster, which frame did you end up using? the CR or the KX?
open to any other Ideas you guys might have.. Thanks Aaron
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Offline sandblaster

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #9 on: May 25, 2015, 03:31:25 AM »
We used a 07 KX450f frame
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline A.Frame187

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #10 on: May 25, 2015, 03:57:04 AM »
and that 2000 cr250 boot ended up fitting? I guess I'll search for one.
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Offline sandblaster

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #11 on: May 25, 2015, 05:43:12 AM »
I'll check again on Tuesday.
You will still need a adapter plate.
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline tkeen511

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Re: Newbie building an 06 KX450f with 93 KX250 engine
« Reply #12 on: January 01, 2016, 02:22:14 AM »
Quote from: sandblaster on May 25, 2015, 05:43:12 AM
I'll check again on Tuesday.
You will still need a adapter plate.
Sorry to bump an old thread, but what kind of adapter plate? Are you using the adapter plate for the connection to the air box, or to the carb? If you have it handy, could you post some pics?
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14 250 sx, 98/14 kx 300 afc, 91 kx 500, 72 s2 350, 11 ktm 250xcw, 10 crf 250x, 97 Montesa 315r, couple other bikes
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