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speedo broken, but 6150-6200 rpm's. Once mine only did 5200 rpm's, and my center carb needed rebuilt. You better check the plugs, see if one doesn't look fine. Mine was kinda blue-oily (fresh oil, not black) and that was my sign. If you run that too long with a lean carb, POP goes the piston.
Also, have you unhooked the fuel shut-off valve next to the pump? Mine was bad. Also, have you added on the fuel pump or changed to higher performance? If not, the front cylinder won't get enough gas, again, lean.
And one more side note, you might want to go pre-mix if you haven't already, or maybe you've bought a new oil injector pump.
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