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Runnin Rich

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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

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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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