I love them ~ they make a HUGE improvement by stopping blow by dead , this not only increases power and fuel economy but , it makes the engine last far longer too .
Sadly , most folks do not install nor break them in correctly ~ it is criticl to assemble the piston and cylinder dry then upon initial startup , immediately rev. the engine to 3,000 RPM and HOLD it there while you count off 60 seconds with a watch , time will sem to slow down but the full 60 seconds is critical to affect proper breakin and 100 % bedding in of the piston rings .
Once you try these , nothing else will do , not even on your old weed whacker engine .
