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I have a cr 125 and it would help a lot if you got a smaller pilot jet for it (it effects the low range fuel mixture) and maybe a smaller jet too. Spark plugs rarely effect the performance on these bikes either they are fouled and the bike doesnt run or the spark plug is good and it goes like...

Are you using regular gas? I know when I switched my sled over to premo it started and ran a lot better. That and using synthetic oil. Put Some premo in it and switch over to klotz and it should run better. But if its a noticable decrease in power I would check the compression.

I always use klotz oil and it always works awsome for me! I took the engine apart and it was clean enough to eat off of. Its not the cheapest oil out there but in my opinion it is the best. But i would definatly run synthetic no matter which brand you choose. Synthetic is so much more friendly...