Maintenance & Technical > KX500 Original
Kick-backs for dicussion...
Paul:
Proves there is a lean condition somewhere. Is the carburetor boot old and cracked? Is the needle as lean as it gets? I'm tossing things out now that effect air / fuel. Something has that bike running lean. All we have to do is figure out what it is...
John:
Maybe.
If I choke the engine - it dies on low rews. A dead engine wouldn?t give you kick-backs...
Been through the carburetor and everything so many times now and I am pretty sure there is no leaks. Got a new V-Force reed cage (and a spacer) as well. All in good conditions including the boot, new stuff but old carburetor.
The needle (if you mean the throttle needle) shouldn't have anything to do with this problem? The throttle is not open when this happens. Would only be air-screw and pilot jet.
/John
Paul:
Well now, you never mentioned it was dead when the choke was on :lol: Yank sarcasm, nothing to worry about :D
Umm, well lets see here... It only does it when the throttle is let off correct? So the only places it will get air are from between the carb and the jug and from the dryside engine seal.
So logically there are only a couple of things here, a reed cage gasket, a carb boot, and a seal.
Its a very long stretch but is there any ooze around the base of the spark plug?
supermotokx:
So let me get this straight: The kick-backs disappear when you ride with the choke on :shock: ?? Well I've got to try that.
What's your carb setup? And what oil-mix ratio are you running?
I'm also racing this bike as a motard (the 250/500) and the kick backs are a pain :cry: , I'm inches away from crashing everytime I go into a corner. It seems to happen more often when I gear down hard and the engine revs high without opening the throttle. Does that make sense?
I've been fiddling with varius sparkplugs and I think a NRK 9 helps a bit. But the bike just runs better with the 8.
I've also tried revving the engine before going into turns, but a) It screws up my braking and b) I'm not sure it works at all :roll:
Oh wait...Could it really be the carb boot? Mine is not too good and to be honest - the carb doesn't fit 100% correct in it, because the 250 tank is in the way. I'm getting that sorted though as I'm making a smaller alu tank. But could that be my problem?
Martin
John:
Nah...
I am quite convinced that everything is more or less OK. Sucking in air was the first thing I checked and I don?t think it does. New gaskets, new reed cage.
This is an 89er. Could this be a problem related to this year?
Scary the bike is actually older than my oldest kid! When I think about an 89er I still think it's kind of new. I guess I'm stuck in my teens where 89 would be a quite new bike!
I really appreciate all your effort here even though it might not sound like it. It could be the famous language barrier?
/John
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