Rode my new bike today and it does pretty good until in goes into high gear, then it seems to be starving for fuel, misfirring, or maybe needs a carb adjustment. 65 was top speed in overdrive, shift down one and it starts pulling again!! Any suggestions will be appreciated. I have drained the old fuel and replaced with new non ethanol along with half a can of sea-foam!!! Also changed the plugs!! Still having issues.