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[QUOTE="Jeffack1, post: 863887, member: 38332"]
I have a stock 2000 YZ125.  I have the clip in the third position, 350 main jet and standard needle.  Air screw 1.5 turns.  During the last week, I have been riding at sea level with a temperature of 70-75 degrees and the bike has been running very good.  I have been using a premix of 32:1.

The only problem that I have been having is when I start the bike up for the first ride of the day, the bike will start up (without choke) on the first kick and then I can not get the bike to rev up.  It will idle, but will not take any throttle without bogging down.  I have tried to let it warm up on idle while giving it short blips of throttle to clear the plug, but after a 30 to 45 seconds, the plug fouls out and that is it.  Switch to a new plug and go riding the rest of the day without any problems at all.

This has happened to me three times during the last week of riding.  I have been using a NGK BR9EG plug.

Any suggestions on how to fix this would be much appreciated.

Thanks,

Jeff
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