Maintenance & Technical > KX500 Original

Surgeing problem

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AFASTboy:
Sup guys, I got a 2000 KX5 thats farily new to me.Ive already done a bunch of cosmetic mods and am know ready for some performance mods.First thing this is with no guestion the fastest thing ive ever rode,ridden, been on in my life.When i first got it it seemed to be jetted really fat,smoked like crazy and spooged out the silencer and all over the inside of the number plate.It seemed to have a funny surgeing problem when i got off the gas from a high rpm run.Thought it was just jetting so i first checked that out im at 1000 feet about 90 degrees and it was jetted with a 178 main which i think was way to big a 58 pilot and clip on the second notch on the needle.It  has a pc pipe and silencer on it since when i bought it ,i mix 40:1  and have since jetted to a 168 main 58 pilot and 3rd position on the needle.I run maxima super M and it runs freaking scary fast now awesome power everywhere bottom all the way to the top plug shows a light tan.The only thing is it surges just a little now not like it did when i first got it but just enough to make me wonder what is going on.It seems that since I dropped the needle clip down to the third position the surgeing  almost stopped but know my bike will barely idle even with the idle screw all the way in.It will idle just fine but i cant raise the idle from where its at no matter what.I run the highest octane available at the pump 92 and Ill probably try some trick fuel that we have around here. It doesnt sound like there is any pinging  or detonating going on just the sounds of the powervalve opening and closing.I think the plugs a BR8ES. Thanks Guys

Paul:
Try a BR7ES, middle clip, 170 main, 2 turns on the air screw. Make sure the carb boot is in good shape and has a good seal on the reed block AND - most messed up by everyone - make sure the seal between the carb and the boot is not over-tightened. If it is it will suck a little air and surge slightly. ALSO, put some RTV red around the pipe flange on the head so it gets a good leak proof seal.

Let us know what you end up with.

AFASTboy:
Thanks man Ill give that a shot could it be caused by that plug? Is the one im useing maybe to hot?I now my exhaust flange seems to be seaping just a tad but not really at all since leaning it out with the 168 jet.I tried going back to the second clip position but the surgeing got worse.The condition doesn't bother me but I was just wondering if this is pretty common and why it does this.Havent tried the 2 turns on the airscrew yet might make it better thanks.

AFASTboy:
is a BR&ES colder than the BR5?

AFASTboy:
Sorry I mean the BR8 not the BR5

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