Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
Friar-Tuck:
500,
The PJ's Idle circuit is Tied to the choke. I'll try to find an illustration.
The bottom of the pj carbs choke looks like #13 in the diagram.
https://www.justatv.com/pages/keihin_pj_parts_diagram/pj_par6.gif
As you rotate the choke knob it should increase or decrease the idle.
If you have an Idle screw that lifts the slide we will have to determine just what exactly you have.
This is the PWK
http://www.sudco.com/Diagrams123/exppwk.gif
Note the choke knob assembly #2 and the idle screw #29 ( which is absent in the PJ )
Do you have the screw type Idle adjustment?
Tuck\o/
500freak:
the idle adjust isnt the choke. it has a adjuster screw, the carb came of a 95 cr, and as far as i know its a pwk.
Friar-Tuck:
500,
The Cr's all came with 38mm PJ's from the factory, You do, I believe have a PWK.
I am also led to believe it is either a 38mm or 38mm air stryker.
There are some markings on the side of the carb body near the where the float bowl attaches.
If possible could verify that nomenclature. It should have PWK and some letter /number combinations.
And if you happen to have the carb off sometime, measure across the opening that goes in the engine side airboot. That will tell you the actual mm.
The smaller carb has a greater air velocity than a larger one. That's why your jetting appears to be so lean.
(Or at least for a 39.5 PWK)
The Jetting you currently have is not all that far of a PWK air striker I bought and put on my CR for singletrack / Woods riding.
If you snoop around CR500Riders.com and search air stryker in the tech section this info should pop up.
( Those guys were also concerned about the small jet sizes)
If it ain't broke don't fix it my grandpa used to say.
I know it did make a noticable difference on my CR. However I don't have a lot of WOT riding here to notice any loss of top end.
I was more worried about hanging on!
I have no doubt you got the carb off the CR. How it may have got there...may be another story.
Tuck\o/
500freak:
well... this is what i came up with. it says pwk-j755-fg31 and it measured 39.5mm. i usually run half to WOT. it just sounded way off to me, and i didnt want to melt the piston down. thanks for the info.
98kaw500rider:
Hi guys , I just picked up a 98 kx500 that has been sitting for the last 3 years. Got it really cheap with a title but i don't know much about these big bores except they are monsters. I cleaned the carb out , new plug , fresh gas. It has a fmf gnarly gold series pipe on it and uni air filter ( no lid on air box ) and i live in Ohio . The jet in it now is a 172 , does anyone know if this should have a bigger jet in it due to the pipe ? ? Also i have mixed 3 oz. of klotz R50 to 1 gallon of 94 ( thats what a local shop told me to mix ) and it seems really rich in a heated garage. I don't really plan on riding it until it warms up , it's only 25 degrees here now. Any help would be great ! Thanks
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