Very strange Karen - normally this would be a clutch fault. However if it has been replaced we assume that all of the plates were done, and the oil changed too. The next thing would be a very worn or dry final drive chain - but thats new too? So - are the engine bolts tight? Are the chain drive sprockets tight? See that there is about 6mm clearance at the clutch lever to handlebar when it is fully out. I do suspect the clutch though - ideally all of the friction plates, all of the pressure plates and the springs replaced too, which must be tightened evenly.
John - Honda Blackbird, April 2008