Loading up CR500

[500rider]

I need some advice on my 500.. I ride strictly woods with my bike and it does pretty well except it loads up terribly when it idles to long.. It's bored twice over and I am running a 175 main jet and needle is dropped to the 4th clip along with a 50:1 fuel mixture.. I tried a hotter plug (b7es) and it helped a little bit but now i'm being told I can burn a hole in my piston..

[rsss396]

lowering the needle will do nothing in the idle circuit.

adjust your air screw out or put a smaller numbered pilot jet in