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Message: [QUOTE="dwcdds93, post: 836422, member: 56534"] I put a 370 jet in my yz 125 and it seemed to run better than with the 360 (stock setting). It still seemed to be running rough on the top end though. I pulled the plug and it was white on one half, and black on the other. I always thought it should be white OR black, not both. Also, the electrodes seemed pretty black for just about 15 minutes on a new plug. Does anybody have an idea of what this is? [/QUOTE]