Runnin Rich

Ive a 99 honda xr250,with a clean plug it starts and idles nice .when driven the bottom end craps out @ top speeds seems to be ok.After when i pull the spark plug it shows a very rich burn-black and sooty. Then hard to start.The air cleaner is good,any suggestions? thanks

current jetting?

It's 135 main 45 pilot,I had the bike into shop,they suggest change of sizes.We are at sea level-1000'.thx

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