Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
gowen:
--- Quote from: Paul ---Ummm, yeah. :lol:
--- Quote from: gowen ---I got it apart now. I will give it a shot. Do you think by having a 45 Pilot that it was making it a PITA to start cold? :shock:
--- End quote ---
This is the big bore 520 correct? You maybe looking at a 180 - 182 @ sea level for a main jet.
--- End quote ---
:shock: :shock: :shock: My jetting is totally screwed up. I don't know how in hell it got so bad.
It seems powerful in the high-end. Do you think I should jump to a 180 from a 160? I was thinking like a 168. Just a thought.
Thanks
--- Quote from: Sharc ---If you over-oiled your filter, it'll run rich with lean jets. And some filter oil may have found its way into your carb and gummed something up. Clean your carb out real good like Paul said, and put on a fresh lightly oiled filter just to get eliminate that as a possible cause...Paul's chart is darn close for jetting. 45 pilot is way too small. I'd guess the pilot circuit is clogged and it's sucking gas from somewhere else and loading-up your bottom end. And your reeds are ok, right...?
good luck.
Sharc
--- End quote ---
Thanks, I will take the air filter out tonight and give it a shot. I'm assuming that they (reeds) are good, I checked them a few months back and the looked good to me, not bent out or anything like that. One problem other than that I do have often is a nut viberating loseon the head often. It's like a center nut right in front f the spark plug and it spits water out. I'm just assuming this is ok, I just tighten it down. I think I will tear the KX down and inspect everything again this evening.
kawdude:
This is great information!
Gowen,
Just for reference because this is your post, my bike is setup the same as yours with the exception of the pipe and my issues are with the mid range and topend. As you know it's a 520 also.
It's currently jetted as...
168M
55P
2nd notch
#7 slide
wet air filter
1 1/4 turns out on the air.
14mm-16mm floats
Seems rich as heck. First time I rode it after putting it back together ran great midway and up. The next day lousy. Could be that the bike was sucking oil from the filter and making it rich. It could be that I'm really too lean now.
gowen:
Kawdude, are you running at sea level? I'm going to buy a 168 main jet and have the dealership set the float height today. I'm going to try the main jet (168) and see how that effects the top-end. I have a feeling I'm lean but is running great, just one of those things I worry excessive about. I have a 52 pilot and am hoping it will help starting the bike. I hate to jump from a 160 to a 168 and screw the top-end up. But, I can always change back. I am going to clean the carb out and see how this hopefully works. I appreciate the input.
kawdude:
I'm in Illinois. So I'm guessing that I'm at 500-1000ft. I'm going to drop the clip to the bottem and see what changes. Becareful with the 52...letting off the gas on a hot piston with restricted amount of gas is a bad thing. Someone made the comment that 52 may be too lean. Let us know what happens. I'm going to make my changes this weekend if the weathers ok and will do the same.
What's your plug look like?
I looked up my elevation...750ft.
Have you seen this link?
http://justkdx.dirtrider.net/carbtuning.html
gowen:
Well, I just got back inside from the garage, and I did go ahead with a 170 Main Jet, also installed the 52 pilot. I have no other pilot jet, I will order a 55 tomarrow. As far as idling, it now does not idle anymore after changing the jets.
Ok, on to riding, I did manage to hit a few powerlines before the darkness took over. Here is what I came up with:
The top-end has improved alot! More hit and power. The mid range has felt like it weekened. The lower range feels not that great. I'd say bad. But, aside from that, once it is hot, it flies with WOT. But, hoping to fix the idling, I have the carb in cleaner. Hoping that it will fix any issues.
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