zr 160 lacking a little performance

My 160 is feeling a little "lethargic" so to speak. It revs clean to the red line, just slower than it should.



It had a new lambda sensor not 2 months ago when i did the head gasket, it had a full servi e at the time too.



The timing is spot on and no fault codes are showing.



Just looking for some pointers.



Cheers.

from the last news http://ift.tt/1DGFTI0

via IFTTT