redmax before the strato engines were amazingly good and durable. straight 2 stroke tech and I loved them. I even am rehabbing my old fleet of trimmers from late 90,s I found a brand new short block I forgot I had and 2 other engines still have 130 psi compression so I am re placing carbs and fuel lines and use them again. I had stacked them up in a corner and sort of forgot about them. my redmax dealer is useless so everything has to come via internet-nothing new about this. early stratos were cold blooded-ran hot and lean.