First things first... define "refreshed" please. Refreshed would lead me to think of a top-end rebuild, and therefore something not set/set up correctly upon reassembly.

Check the carb settings. Check all the jets are clear, the air screw and float levels are set correctly, and that the filter in the tank is clear. (I.e. check for fuel starvation.)

When you are sure the carbs are OK, check for air leaks. It sounds lean. Does it run better with the choke lever on? (Don't run it any longer than absolutely necessary to check this!) Check the plumbing to the two air corrector solenoids.

Could be the carbs seated in the manifold incorrectly (possible to push them in only half way!), airbox not fitted properly, air filter left out by mistake, a warped inlet manifold, or a split/perished inlet manifold.

More serious things could be a leaking base gasket, leaking head gasket, or dead crank seal(s). All can produce symptoms as you describe, but easiest to check pretty much in the order I've stated.
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Andy.
NSR-WORLD.COM

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