KX Riders
Maintenance & Technical => KX500 Original => Topic started by: sevenbridgesangler on August 03, 2010, 02:17:16 AM
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Hey all you might remember me from awhile back. I picked up an 85' 500 and it ran fine the day I bought it but, then it began to give me smoking problems and fuel coming out of the intake. Well for the most part I pretty much gave up after getting the carb rebuilt and replacing the head gasket. Well a buddy and I decided to give it a whirl and look into it a little more. We started it and of course was still smoking real bad. Were looking around and then a screw falls out. I look I say that screw looks important :-o Then I realize it's my air screw. I put it back in and it ran much beter slowed the smoking down abit idles much better but still wouldn't move under it's own power. So we looked at the reeds and what do you know one whole chunk of the reed was missing. So I ordered some reeds put em' in and BINGO!! It worked. It still isn't running perfect. So my question is the Air screw and the other adjustment the pilot I believe what should I adjust them to at least a starting point? It looks like the bike has a Pro Circuit pipe ( It's painted over) and I am at sea level if that helps. Thanks in advance for the help and sory for the real lengthy post.
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Well it is a 2 stroke so it's gonna smoke. But if the pipe is pro-circus then this is off thier website. KX500 - - - - -
Pro Circuit 170 60 STD 3RD 1 1/2
Pull the carb apart and clear out all passages and jets. Make sure your needle clip is in the 3rd slot from the bottom. Normally the needles only have 5 slots for the clip. Your air screw that fell out turn it in all the way until it seats and then back it out 1 1/2 turns.
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According to my Clymer's manual your carb, (1985) should be a
Type Mikuni
Size VM38SS
Main Jet 360
Jetneedle/clip position 6FJ51/ 3
Needle jet R-2
Slide cutaway 3.0
Pilot jet 40
Float height 19.1mm (0.75in.)
Fuel level 1-3mm (0.04-0.12 IN.)
http://www.kxriders.com/forums/index.php?page=11
http://www.kxriders.com/forums/index.php?cat=9
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Alright thanks guys. I'll take a look sometime this week when I get a chance.
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This is a brief explanation on what does what in your carb:
http://www.kxriders.com/coppermine/displayimage.php?album=lastup&cat=1&pos=52
(http://www.kxriders.com/coppermine/displayimage.php?album=lastup&cat=1&pos=52)
I apologize for not being able to put the uploads in order, you may have to scroll to find the next page but they were uploaded together.
Tuck\o/
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Where did the missing chunk of reed go ? Could it pass through the cylinder without causing damage ?
Extreem
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Sometimes, yes... They'll get sucked in and blown out. sometimes they get stuck in the crankcase and wait to be extracted at re-build.
Usually the carbon fiber or fiberglass will just get chewed up and spit out. In the old days the stainless reeds may have done a bit more damage!
Tuck\o/
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And not trying to be a weeinie, but if you have issues like that again, and have to tear into the head, I would suggest that you may as well tear into everything else intake related (pull the carb, reeds, manifold, etc.) and check everything...