Keihin PWK 36S issues

digger wrote:

Your 00" KX125 uses a 36mm PWK, that is what came on it stock. There is no internal differences, parts wise between the 36 and 38...

Your 00" KX125 uses a 36mm PWK, that is what came on it stock. There is no internal differences, parts wise between the 36 and 38 mm PWK 2's( squarish top held on by 2 screws). The only difference being the bore size on the front(engine) side of the carb.

The length of the float needle valve that you need should measure about 14.25 mm from the rubber point to the top of the plunger(compressed)

I do NOT see any missing parts in the pic that you have posted. The rubber on the bottom of the float needle is what seals that hole.

How are you testing to see if the float needle is working correctly ? I don't understand with the fuel line. You are putting the bowl back on and letting it fill up ?

speed_racer wrote:

Much experience with this. This takes 5 minutes and it's the insurance I do on every single dam carb. 1. take q tip and wrap super...

Much experience with this. This takes 5 minutes and it's the insurance I do on every single dam carb.
1. take q tip and wrap super fine steel wool on the end, small enough to fit inside brass hole for fuel(aka needle seat).
2. put q tip in drill and other end inside carb brass hole, clean and shine up inside of brass hole and make sure there is no ob-longed, or egg shaped holes. Clean with contact cleaner and blow out.
3. lightly clean tip of float needle with white rag and contact cleaner, very light pressure, don't tear black rubber tip, look at black tip and make sure it's not jacked up at all, check the picture on line against your needle because you have 2 different size ones, not sure why, but one is way wrong in size.
3A. Make sure float has no hole in it, shake it for fuel inside, or put in water and see if floats, clean with contact cleaner and blow off.
4. put the float and needle together with carb, DO NOT put bowl on carb
5.keep carb upside down, put hose on brass fuel inlet and use mouth to suck and hold pressure with your tongue, do this several times and make sure it will hold pressure with your tongue after you suck down the needle. When releasing pressure it should go "pop" in your mouth...
6. next, leave bowl off, and hook IV system(your gas tank up high on shelf) fuel to carb with long fuel line, keep carb upside down, now turn on fuel from IV fuel system and it should NOT leak out of needle until you pull up on the float, and when you release the float it should stop flowing again, test this several times, this is the real way we test carbs before we mount them to insure it won't spill fuel everywhere after you've mounted it.
7. if it won't hold pressure with your tongue, or it leaks upside down with test fuel supplied, it will 100% leak on motorcycle. if both of these are good and it still leaks on bike check for super fine crack in brass tube coming up from float bowl, plug the bottom of the drain tube on float bowl and use mouth to blow into brass tube, it should not leak air when plugging the bottom. There is never a leaking carb gets past me, no way.