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Old 10-14-2007, 03:50 PM   #1 (permalink)
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High idle question

I've got a 96 RMK 500 recently and just went through the carbs. Everthing looked OK, fairly clean acually, but cleaned anyway. Set idle adjusting screw out at about 4 turns and air srcew at 1. Started it up and it idles at about 4200RPM. So, I tryed turning air screw in and nothing. Turned both in all the way for about 5sec. and idle didn't change a bit, so i just shuter down. Looked at slides they are both bottomed out. Just can't figure out why it's so high idle. Can someone point me in the right direction? Thanks
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Old 10-14-2007, 03:56 PM   #2 (permalink)
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I would check for rips and tears in the carb boots, and check the crank seals for leaks. You may have an air leak, causing the sled to run lean. You may also have to clean the carbs again, pulling the pilot and main jets out, and make sure the passages to the jets are clean. If you turned the air screw in all the way with no change, that's a pretty good indication you have something blocking the air passageway to the jet...
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Old 10-14-2007, 07:50 PM   #3 (permalink)
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Did you try turning the larger idle screws out at all? Is there 1/8" of play in the throttle lever before it starts to move the slide?
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Old 10-18-2007, 08:19 AM   #4 (permalink)
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Well, I got a chance to check out the sled last night. Thanks for responding.
I pulled both carbs and checked out the air srew really good and it's clean as a can be. The jets are 320, is this a correct jet? Removed needle and Jets, clean, you can see right through. Used compressed air through passages.
Checked the boots, there in great condition.
Assembled, same problem. I had air screws in all the way and it runs 4K RPM.
Sprayed carb cleaner all around the motor for any vacuum leaks, found none.
Both piston valves are all the way down but the throttle is tight, so I will loosen that but, I'm not convinced that that's my problem.
Larger Idler screws turned out, it's not holding the valves.
What else is there?
I removed the spark plugs and one was new the other not. It was wet and looked, well almost oil fouled. Piston tops have carbon on top and clean around edges.
Not sure where to go from here? Any suggetions?
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Old 10-18-2007, 04:02 PM   #5 (permalink)
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Air screw should be at 3/4 to 1 turn out from gently bottomed.
THe reason that it is idling so fast it that it is too lean.
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Old 10-18-2007, 07:39 PM   #6 (permalink)
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I understand. The idle atays the same regardless Zero turns to 1 turn. It does the same thing, yet I find no air leaks and I've cleaned twice when originally it seemed clean to begin with.
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Old 10-19-2007, 10:19 AM   #7 (permalink)
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Are you testing with the air box off?
Check that the slides are dropping all the way down and are even. You can do this by feel. It just may be that when you reassembled it, you have the throttle cable too tight at idle. Check that there is a little free play in the cable before the slides start to lift.
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Old 10-20-2007, 07:40 PM   #8 (permalink)
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I GOT IT!!! I disconnected the throttle cable and I knew right away that the slides where lower. So, I adjusted the cables at the top of the carbs cuz I had already given as much cable as I could. Then the dirty basturd wouldn't start! I think I through out my arm puling the thing over! Well, I put my spark tester on it and it looked a little weak so, I pulled the handle bar cover off and disconnected the kill switch cuz ofcourse there's no key. Started right up. Couple adjustments and she purrs like a, well, I don't want to be talkin about any cats so, you get the point. Through all that and the kill switch goes bad. Thats enough to piss a guy off!
I think the trottle cable is the wrong one cuz there's only like 3/16"
cable showing before the shething. That's not enough to stretch to the lever.
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Old 10-20-2007, 11:44 PM   #9 (permalink)
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Another happy customer.
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