Maintenance & Technical > KX500 Original
#8 slide versus #7
DoldGuy:
KXpegger,
Keep us posted, I am curious if the #8 will actually clean up the bottomend (and a bigger pilot) with out running lean. I have multiple slides, but no #8's to try. Sounds as you have other bikes (PWK Equipped?) check what # slides they have. The smaller the bike the smaller the cutaway I have found (250 #6 slide / 125 #5 slide). Oh and by the way, I am envious of all you aluminum framed guys :x :x
Hillclimb#42:
I think having my idle screwed in too far, made my 500 surge more. Otherwise, I have no useful input, but post your findings. We all want the AF and wish to trade.
kawsf:
Hello Kxpegger,
The key to getting the 500 to gun good down low is the slide,found this out about 15 years ago.I rode a lot of tight woods,and never could get it to run good off idle.changing to a leaner slide will give the 500 great responce down low.One size leaner was all i needed,you may need more depending were you live. If you dont have a slide you can cut 1mm off the venturi,that will give you one size difference.I have done this many times,if you are in a hurry.Good luck.
kxpegger:
After I put my reading glasses on it looks more like a #6 on the slide than the #8 I originally thought it was. The #6 is a richer slide if I understand things correctly. I went to the Keihin website and looked up the PWK 72R series carb which is 39mm and they show it with a #6 slide as standard.
My Clymer manual and everything else I've downloaded says I should have a #7 slide for a 2004 motor.
Well, I can see where this is all headed!!!!
I really don't enjoy carb tuning but if all I have left to do is change the slide out I'll be happy with that.
What I've got so far is 55 Pilot, 170 Main, N82M needle #2 position and a #6 slide.
We'll it's back out to the garage to put the carb back on. I'll keep you guys posted on how she runs today with the changes I have made.
Thanks again for everyones help!
kxpegger:
--- Quote from: kxpegger on January 03, 2009, 02:00:48 AM ---After I put my reading glasses on it looks more like a #6 on the slide than the #8 I originally thought it was. The #6 is a richer slide if I understand things correctly. I went to the Keihin website and looked up the PWK 72R series carb which is 39mm and they show it with a #6 slide as standard.
My Clymer manual and everything else I've downloaded says I should have a #7 slide for a 2004 motor.
Well, I can see where this is all headed!!!!
I really don't enjoy carb tuning but if all I have left to do is change the slide out I'll be happy with that.
What I've got so far is 55 Pilot, 170 Main, N82M needle #2 position and a #6 slide.
We'll it's back out to the garage to put the carb back on. I'll keep you guys posted on how she runs today with the changes I have made.
Thanks again for everyones help!
--- End quote ---
The ride went well!
I could tell the second I started it that things were different. It idled a little slower and had a crisper exhaust note. I decided not to mess with the air screw or idle until it got good and warmed up. I took it over to the dunes and really loaded the bike up by being in a couple of gears to high with varying amounts of throttle. I was trying to see if it would ping or load up when I got back on the throttle (pump gas). It did neither! It just kept chugging along and when I twisted the throttle it just went with no hesitation of sputtering. It did surge a bit more than usual so I headed back to the truck to adjust the air screw and idle.
The air screw ended up at about 7/8 maybe almost a full turn and I was also able to turn the idle down and still get it to run. The bike starts when hot now usually within a couple kicks. It will idle now for about 30-45 seconds before it starts to load up a bit but with a couple of blips goes right back to idling. The surging is almost completely gone on flat surfaces with just an extra ping or two when coming down a steep or long hill.
I've noticed a lot of improvement almost all the way from idle to about 3/4 in the hard pack because the revs are already maxed out before I can get to full throttle. The only time I got to full throttle was really short shifting in the dunes just to see how well it would pick-up under a big load!
The #6 slide seems to be working fine so I might just leave it in there. I'm thinking because it was about 45 to 50 degrees today the bike was fine with it. I may have to go with the #7 when things start to heat up here in Las Vegas. Less air density I think means you need less fuel?
Overall I'm pretty happy with the results! Reason for the long post! Still wondering what the recommended #7 slide might do though?
Once again I want to thank everyone for the help. There's some very knowledgeable people at this site!
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