Got an 82 RD350. Been trying to get this thing to run properly, and been doing a lot of this Figured I'd post here because I need some old skool thinkin'. Redline is 9.5. If I give it more than half throttle above 4k, it starts to break up, and won't pull. If I'm gentle on the throttle I can get it to rev out, but there ain't much power. It gets worse as the motor warms up. Plug is medium to dark brown. Sounds like it's too rich, doesn't it? But the more I lean it out, the worse it gets. And the plug doesn't appear to change color. Checked the float level, it's bang on spec. I'm outta ideas, guys. Cleaned the carb out a couple of times, synched the cables, made sure the airfilters were clean and properly oiled. Help.