Uotani Full powerKit is effective.
With the KZ900, I had a hard time with the carburetor CR29 due to the lack of burned plug and cover, so I decided to install the full power kit, even though it was expensive. After installing the kit, the low RPM torque increased (feel), and the plug was able to burn properly, so I can go to the carburetor fine-tuning with peace of mind. I don't know about the improvement in fuel economy, as I have only driven less than 100km since the installation.
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