THE DUKE'S PERFORMANCE UPGRADE CARBURETOR FITS ECHO CS-590 CS-620P

Excellent carburetor so far it’s working great and everything is wonderful

Put in chainsaw and started right up. I was expecting to have to tune it but that was not the case. I started it and ran it and shut it off multiple times and still no tuning. I will see how long it lasts after cutting trees and see if I have to tune it after that. But as a business owner, it started better than any other carburetor I have purchased from other company's.

Very good actually fired first pull and tune in like 15 min

Put it on my cs590, saw would pop on choke, take the choke off, it would fire and run for about 2 seconds on high idle then die. Could not get it to run more than a couple seconds at a time. I took it off and put the factory carb back on, runs like a champ.

These modifications really let my CS590 eat wood. Got to put this on my YouTube channel