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Message: [QUOTE="whenfoxforks-ruled, post: 1407831, member: 73147"] Fresh premium fuel, from a busy station, usually not the cheapest place around either. Decent grade of premix, at the recommended ratio. If the previous builder did their job correctly, still double check it. Other wise all the jetting in the world will not help. Honestly, there is a large group that would do other wise and reverse engineer the problem by playing with the premix ratio. It tells a lot about how they ride their bike. If it was rode hard/like it was built for, it would seize, guaranteed. A bog off bottom, normally is the idle/pilot circuit. Rich or lean can be determined from the air screw adjustment, the choke, or a good plug read. If drastic jetting changes do not affect it, it is something else. Like the right crank seal, exhaust valve, or something? Or even a really dirty carb. Did you remove all the brass? And there is the, rode properly to clear out the engine part. I do know people terrified of the 2 stroke MX bike hit in the powerband, and they try to ride around it. They need a slower bike, or get used to it, like most of us! In a month, you will be wanting more power. That can be had by a rebuild. Depending on the hours of operation/quality of the last rebuild and maintenance. And change the float valve every year, it will cause a bog also. [/QUOTE]