gas milage

[Gnarlyroad]

83 cb650sc nighthawk. Rebuilt carbs, new cam chain, new air filter, oil and filter. Decreased fuel milage. Not that much of a change but enough to be noticable.Used to get 200 klicks or better per tank, now getting 175klicks. Have some fluctuation in the idle adjustment; set the idle at low starting temp(or the bike starts but won't idle, gotta leave the choke on ) have to re-adjust when warm or the idle is to high. Otherwise the bike is running really well. Any ideas on what to look for or adjust.

[redcoat]

wrong size jest eg main jet shoukld be .1xx, but the shop fitted the largest optional one, as that is what they had. A change from a .112 to a .108 makes a huge change. Don't know if the CB650 carbs had a needle that could have its position changed?
Soft tires, dragging brake, even VERY slightly, bad wheel bearings, clogged air filter (wash and oil, or a new one)

Did you do the carbs yourself?