I wonder if this kit makes the KLR burn more fuel even though the seller claims it improves mileage.
Unless the applicable physical/chemical laws are repealed or amended, an engine develops power by processing fuel. Staking out a controversial concept, more power requires processing more fuel per unit time.
Thus, the stated performance improvements, more power and better fuel economy simultaneously available, might appear antagonistic and contradictory.
Regardless, the basic operational mechanics regarding the METHOD whereby the developmental needle achieves the claimed performance improvements remain interesting, but unknown and unmeasured, no matter how consistently precise needles are manufactured, seems to me.
I wonder, HOW does the developmental needle produce its claimed performance improvements? But, that's probably just ME!
Nonetheless, best wishes to the kit manufacturer, vendor, and users; enjoy!