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[QUOTE="gopat, post: 1204039, member: 78315"]
All,
I just bought a box stock 2000 kdx220 that had set for about 2  years.  I replaced the gas, cleaned the carb and it idles great, but it will bog out above 1/4 throttle.  The pilot jet was plugged, but there was no varnish or crud in the carb.  I could not remove the needle jet orfice where the main jet attaches but it was very clean and spray carb cleaner really flies through it...  The float level is good.

Additionally, the compression feels good, the piston and bore are very clean, but I have yet to verify if the power valve is OK.  The mains and top end bearings are all in good shape (tight). I removed the air filter and stock silencer and it still runs so rich that it will bog and die after 1 minute of operation with the plug being soaking wet...  FWIW, the spark seems strong, as it will jump from the electrode to the plug side wall with a blue spark.

Any ideas what I might have missed?  Any ideas what might cause it to run extremely rich?
Thanks!
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