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i have a 99 Powder special 600 EFI 2 stroke, and it starts with one pull at -30, warms up with smooth steady idle. then i start riding and it will run and make excellent power but only for so long, then once the engine revs to 6-7000 RPM it bogs like its choking its self out and if you hold it pinned , it bogs down to 1-2000RPM then it takes off like nothings wrong back up to 6-7000RPM. but if you fether the throttle up to 6-7000RPM it will die out until 4000 then start to pick up until 6-7000, if i let off the throttle compleatly it will come down to a idle and run fine. i replaced the fuel pump, pickups, plugs, new fuel lines, no loose grounds..