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Kawasaki MX & Off-Road Dirt Bikes
KX85 engine vs KX100 engine
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[QUOTE="griffbones, post: 1124200, member: 72285"] [b]Idle question[/b] The plug seemed to be a nice tan color after my son spent the afternoon riding it. This wasn't doing throttle chops, I just checked the plug at the end of the day. The only issue I have is that it won't always maintain a good idle. When we got home instead of trying to fix this new carb I just swapped it out for the carb from our 85 engine (that had been working perfectly) and changed out the main jet and needle for the ones for the 100 engine. But it still seemed to have the same identicle problem. I did noticed that with [B]either[/B] carb if I turn the air screw all of the way in the engine will not imeadiately die, but after a while will slowly start getting rougher. I started with both carbs set to factory specs, stock jetting and air screw at 1 3/8 turns out. It seems like maybe it will idle better at only 1 turn out but I have not run it long enough at one turn out to be able to tell yet. It really bothers me that the engine will not imeadiately die when I seat the air screw, using either carb. I know for a fact that this current carb is spotless clean and in perfect working condition! If I use the correction factor chart supplied by Kawasaki, it shows that the stock 45 slow jet should be fine at the 45 - 50 degree temps we are currently having. Is it possible that this engine will require a bigger slow jet than what is recommended? I did check for air leaks by spraying brake cleaner all around the cylinder base, carb, carb boot, reed cage etc. and found nothing. Before someone asks, yes I tried setting the curb idle screw on both carbs, it will only raise the idle for a couple seconds and then it falls down again. For some reason the throttle still seems very crisp and responsive, even coming off of idle. So other than this air screw/ low idle issue the bike runs great. But for my son to ride this bike in the woods I need for it to have a decent idle. So does anyone have any answers or ideas on this issue? [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
KX85 engine vs KX100 engine
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