Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
gowen:
Well, I just got back from tweaking and tuning it and here goes:
Cleaned the carb, air dried and blew the holes with compressed air. Needless to say, it was mint. Anyway, I still have the 170 and 52 pilot. I decided to give it a shot. No idle! I have the screw on the idle screw all the way in! this is at 2 turns on the air. So, I give it a run........ WOW! Great mid-top end. Jsut what I like, but I really like the bike to idle so I don't have to gas it every time I clutch it. So, I am thinking I am rich down low. Well I'm at a 52 pilot, I unscrew the air screw to 3 turns out. Did nothing. Checked the reeds again, look new. I drop the needle one notch. (lean) and it does not help, helped the mid range but changed the top end. I like it in the center. It did OK with the 45 pilot. I'm confused. If I move to a 58, it will richen the low end up and take more away from the idle. Is something wrong! I opened the holes in the air box wondering if it would lean up. But, did not help.
I did remove the spring from the idle screw and if I screw it absolutely all the way in, it will idle fine! The screw is not worn at the tip and there is no marks on the slider.
gowen:
Apon looking at my needle it reads: R1366N???
Is this correct? I ordered a "stock" needle.
kawdude:
Thinking outloud.
To make the bike idle you need to raise the slide farther than normal by removing the spring. Does this mean there is not enough air getting thru to hold the idle or not enough gas getting thru to hold the idle.
More air needed = leaner setting
More gas needed = richer setting
:?:
I tend to think that you're not getting enough gas when the slide is down. Although, on mine leaning the pilot did make it idle better. However, I did cut a little off the spring...d**nit. I tend to make too many changes at once! :roll:
Does the raising the clip, aka dropping the needle, change the idle properties? I don't think so but changing to a different slide # would either by leaning it or richening it. But that should be necessary. I have a 7 slide also but I think the standard is 6???
I think when the slide is down the needle has not reached the tapered part so when the slide is raised using an extended idle screw you may be reaching the taper and that may = more fuel in the throat. So if you dropped the needle and leaned it out that would = less gas when the slide is down at the idle position.
I like to ramble about s**t that I no nothing about but it is kinda fun!!! However, I do think we're getting somewhere.
I hope the experts read these latest posts!!!
--- Quote from: gowen ---Well, I just got back from tweaking and tuning it and here goes:
Cleaned the carb, air dried and blew the holes with compressed air. Needless to say, it was mint. Anyway, I still have the 170 and 52 pilot. I decided to give it a shot. No idle! I have the screw on the idle screw all the way in! this is at 2 turns on the air. So, I give it a run........ WOW! Great mid-top end. Jsut what I like, but I really like the bike to idle so I don't have to gas it every time I clutch it. So, I am thinking I am rich down low. Well I'm at a 52 pilot, I unscrew the air screw to 3 turns out. Did nothing. Checked the reeds again, look new. I drop the needle one notch. (lean) and it does not help, helped the mid range but changed the top end. I like it in the center. It did OK with the 45 pilot. I'm confused. If I move to a 58, it will richen the low end up and take more away from the idle. Is something wrong! I opened the holes in the air box wondering if it would lean up. But, did not help.
I did remove the spring from the idle screw and if I screw it absolutely all the way in, it will idle fine! The screw is not worn at the tip and there is no marks on the slider.
--- End quote ---
kawdude:
This I don't know. That number means nothing to me. Mine is the standard N82xxx one. That may be a Keihin number and not a Kawasaki number.
Info on that number...
http://www.dirtrider.net/justkdx/jetneedles.html
--- Quote from: gowen ---Apon looking at my needle it reads: R1366N???
Is this correct? I ordered a "stock" needle.
--- End quote ---
gowen:
Well, I changed the needle back to the 3rd clip. Which took me all night, as I rounded the head off the screw-like-thingy that holds the needle in. Ended up breaking it in half. Well, thank God I have a spare parts bike!
Anyway, on to whatever. I dropped the needle to the 2nd clip. It helped nothing except I gained more power down low, but it felt like it hurt the top-end by not letting it hit the powerband. :?: So, The needle and the main are good. I'm thinking more on the lines of the idle screw. Kawdude, I believe #7 is stock according to my Clymer Manual. I do happen to have a #6 though. But according to justkdx it will richen it, which from what I'm learning, leaning it out will make it idle. Thinking about that when I'm running out of gas it tends to Rev and rev until it completely runs out of fuel. :idea: So, I am guessing I'm too rich down low. I did conduct an experment. I turned the gas off and let it try to idle.I helped it until it started to empty and low and behold.. It idled! :shock: for a few seconds then tried to did the full rev thingy and I quickly turned the gas back on as not to hurt it. :cry:
So, I'm thinking I need to lean the bottom end. Being at a #7, to lean it, I would need to try a #8. But, as my mid range seems ok and so does the top, I believe the slide does work with the mid range too. The pilot I believe is the main objective to idleing. Being I'm at a 52 and came from a 45. It puffs smoke a bit. But running a 45 pilot, it would idle but very slightly and most of the time would kill within a 10 seconds or so.
Using a 52 and 3 turns out on the air screw (which is the same as 2.5 I think) it would try to puff along, but would die within' a second. So, like I said eariler, it would chug with the spring removed and the slider pushed slightly, but this is going to the 1/8-1/4 throttle and I believe it is lifting the slider to the point of the (taper) where it is using the 1/8 position to idle, I don't think this is good. I believe the pilot should be kicking in even with the slider all the way down. I could be wrong though. So, should I drop the pilot to lets say like a 40 and see if it idles? I hate to sacrifice a nice bike for something as stupid as idleing though. :wink:
Looking at the chart, what is I.M.S.? Should I try to run without a air filter just to idle? That would eliminate any questions as to a oversaturated air filter (which I dont' think it is).
My only options are to try to remove the air screw, kinda allow ALOT of air and/or change the pilot jet to something lower than a 45 as it was still having troubles. I'm just talking about sitting still no riding. What;s your guys thoughts?
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