Maintenance & Technical > KX250 / KX125

1979 KX250 Stock Carb Specs

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ctharre:
Hey all,

I'm in the middle of getting a new project bike going.  I picked up a 79 kx250 in real bad shape last summer and am in the middle of making it trail worthy again. 

I'm running into the problem that I cannot find any good info on specs for the bike.  I would like like to get the carb set back to stock and see how it runs, but right now I don't even know what carb it has on it and if it is the original or not.

Anyways if anyone has any information on this model the help would be appreciated.
thanks
chris

Foxx4Beaver:
this might help a bit....until someone else can hopefully come up with something better...

http://www.partzilla.com/parts/search/Kawasaki/Motorcycle/1979/KX250-A5/CARBURETOR%20(78-79)/parts.html

*EDIT*
Welcome to the site by the way!

ctharre:
Thanks man. What that link shows for the jets does not match up with what is on the carb now. I think I recall the diagram showing a 172.5 main and a 50 pilot. They are hard to read but I think I have a 300 main and 40 pilot pulled out from it.

Now I'm pretty carb ignorant so I don't know if it really matters but I'm thinking that the carb that I have is not original. I know it's a mikuni vm type and I see a v10 stamped on it, but that name doesn't match up with anything I've seen looking on the internet. I measured the inside diameter of the carb on the engine side and it's about 38-38.5mm. Not sure if that identifies it.

I guess if I don't have a stock carb, i would like to know what I do have and if I can make it work, you know?

Foxx4Beaver:
If it's got a 300main in it, I would think it's not the original carb, but I'm really not sure. I was hoping someone else would've chimed in that knows something about the A5's.

Do you know if the bike ran with that carb you currently have?...if yes, I wouldn't sweat it too much, just give it a good thorough cleaning...and check the spark plug a couple times to be sure it's not burning excessively lean...the plug insulator will be fairly white if it's too lean.

If you don't know if it's been run with that carb....then you're gonna be swinging in the dark a bit...but I still wouldn't sweat it too much. Again, give it a good thorough cleaning, set the needle clip in the middle position(if it's not already)...once you get it running, pay attention on how it reacts when you turn the throttle. If it wants to die right out once you start cracking the throttle off idle, there's a good chance it'll need a bigger pilot...and again....check the plug several times...if the insulator is anything lighter than a "coffee brown", then you know you'll need to go richer.

Another possible option, you could contact Sudco, and see what info they can give...and depending on your budget...you may be able to buy a brand new carb from them.

http://www.sudco.com/

ctharre:
Thats what I was thinking too. 

I did run the bike this fall but really just rode around the yard a couple of times because the back brakes were broken and I didn't feel like getting too crazy on it with half the brakes gone.  So yes it was running on that carb, but I remember it didn't feel like it was running quite right.  The biggest think that stuck out was that it was idling very high.  Other than that I really didn't ride enough to diagnose anything.

If it the bike will work with this carb even though it's not original I'm ok with that.  I've done a good cleaning on the carb and it seems in real good shape.  I guess it will just take some tinkering with the jets to get it right. 

To start this tinkering, where should my baseline with the jets be? Should I leave the setup it is in now from the p.o, or should I get it set with the original jet sizes from that part diagram?   At 5 bucks a pop for jets I'd like to not have to buy too many to get this working since this is supposed to be just a budget trail bike and not a full restore!

Thanks for the advice so far

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