Jittery at low revs

[domtrails]

Sounds like one of either two things - could be the fuel so your carbs need to be balanced, easy if you have the gear and know how but a cheap mechanic fix if not but before that whip off your tank and have a look at the filter it sounds like a breathing problem if the bike is oldish then it will be pushing oil up into the filter and need regular cleaning and or change it for an after market you should notice a nice change in the pickup around 6500 with a k&n or something similar - but buy the cleaning kit and clean it every 2000 or you will have issues again.

Enjoy your ride bro.