That's a bit naff!
Do you think you crank is out of balance ? You could try getting it balanced? Might be a cheaper option than replacing it.
Mine runs so much better now I've rebuilt it a lot less vibration (mine was well out), but I've also been trying to get better at tuning and that's helped too. My low jet is now set closer to 1 turn than 1 1/2 fom the stop and runs a lot smoother
Tom