Yesterday, I tore down 2 fairly new Poulin Pros (Lowe's version) because they were both light on compression. 1 had 100 psi and 1 had 125 psi. They both just quit running after around 15-20 hrs of use. Yup, used good premix, air filter clean and correct plug. Both cylinders scored beyond use. Apparently there is an inherant problem with these Poulins that allows debris in or something.
Anyhow, when I popped the cylinder off one, out dropped 2 pcs of plastic?? Figured out they slip into the liner and appear to be for the transfer ports. Maybe adjustable?
I have raced and ridden off road 2-strokes for over 35 years and have NEVER seen plastic used as part of a liner.
Is this common in chainsaws for some reason? I can't imagine that it would offer long life. The two pcs were scored as badly as the rest of the cylinder. Did the piston skirt cut the plastic which caused all the scoring?
What have you all seen?
Anyhow, when I popped the cylinder off one, out dropped 2 pcs of plastic?? Figured out they slip into the liner and appear to be for the transfer ports. Maybe adjustable?
I have raced and ridden off road 2-strokes for over 35 years and have NEVER seen plastic used as part of a liner.
Is this common in chainsaws for some reason? I can't imagine that it would offer long life. The two pcs were scored as badly as the rest of the cylinder. Did the piston skirt cut the plastic which caused all the scoring?
What have you all seen?