420cc, Dune port, CPI pipes, 38mm Carbs. If you slowly bring the rpm's up to a relativley high rpm, the left cylinder will slowly get quieter then quit all together and will come back on when you hit the gas. Even while putting around the left side always sounds a little "off". At WOT, it will haul ass for the most part, then both sides will spit and sputter. Checked the plugs a WOT and they are brown. At an idle, they are still brown but very wet. Also, at an idle and putting around, the left side smokes more than the other and drips oil out the pipe.
That's all the details I can think of so I hope someone has an idea.