Maintenance & Technical > KX500 Original

New Owner

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95formula847:
today i put a new plug in it. The old plug was very clean and was tan in color. I also drained the gas and put fresh turbo blue mixed 50 to 1. I rode it around and same thing. Doesnt feel much different. It still wont go more than maybe 10 mph in first before it sounds like its dieing. It fells tourquey down low but has no grunt through the middle or up top at all.

95formula847:
im tryin to find out how to check the kips but cant find anything about it. is this another term for the power valve? could this be causing problems? it runs like it has the choke on. thats the best description.

oic0:
How is the pipe? is it majorly crushed or full of crap? maybe some dirt dobbers living in the tail pipe? My powervalve is sort of screwed up. It just sort of flops around. Bike still runs like a raped ape though. You can test yours though by removing the exhaust pipe and manually actuating the little control arm under the plastic cover on the side of the engine to see if it opens and closes. Can also leave that cover off with the bike running (pipe on of course) and see if revving moves the arm like it should.

Did you remove the main jet and make sure it is clean? Also see if its main jet and needle position conform atleast somewhat to http://www.kxriders.com/forums/index.php?page=11


I'm in the same boat as you though. I bought a bit of a basket case and have been going through it. I need to fix my powervalve, put in a new piston, replace several spokes, fork seals, etc... Big pain when you want to play with your new toy huh?

95formula847:
The headpipe has been cracked and fixed many times, its also got a few medium dents on it and leaks at the engine flange. I took off the left grey plastic cover that has 5-6 bolts and all there was in there was a large gerey cylinder that spun? crank weight? I would really love to find a pic of what cover to take off because i have been searching for days and im completely confused at what im looking for.

I did not remove the main jet. I havnt done anything to the carb yet. Which screw is the idle screw? There is a screw with a spring and a small gold screw almost flush below that. Which is which?

And yea i want to ride so bad its not even funny. When i use to ride a few years ago on a regular basis all of my buddies thought it was boring and never wanted to get bikes/quads. Now after i have sold all my off road toys... literally 10 of my freinds got bikes and ride every weekend.

UPDATE: i took off the silencer cause it was leaking horribly where it meets the head pipe. WOW! The rivets holding the center section are all gone and its now held with one huge drywall screw. I pulled the 3 bolts out of the end of the silencer and pulled the center section out. I found the packing to be soaked with old oil and almost burnt the whole way through. It was comming apart in flakes and chunks. I rode the bike around for about a minute with no silencer and man what a difference. Bike has alot more power. So im gonna get a new silencer and a gnarly pipe. What brand silencer should i go with for trail riding to pair up with the gnarly pipe?

DoldGuy:
95formula,
I have a FMF Gnarly that I probably will not be using if you are interested. Depending on which Coast you are closest to, I believe Motorad has one too (I am East Coast, he's West). As far as silencers, I think you would be happy with the FMF or PC

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