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Message: [QUOTE="spanky250, post: 155281, member: 20897"] Since the problem started right after you performed these two tasks, it seemingly should be related. How did you clean the pipe out? Could something be in the pipe, restricting it? Are these the only things that you did? Very loose packing in a silencer can cause a lot of turbulence in the exhaust, effectively restricting it. The problem you describe does sound like a possible restriction in the exhaust. I had a Yamaha DT 250 once, and when i purchased it, it ran much as you describe. When you opened the throttle, it would sputter and break up for a few seconds, then clean itself out and begin revving correctly. The problem turned out to be a carboned up silencer. As for the jetting, if it ran correctly before, then the jetting is probably fine. [/QUOTE]