Stihl 390's with high compression pop up pistons 

Man that thing is running good.... I have a STIHL 029 Going to convert to the big boar cylinder 49cc I will definitely use a pop up piston and do some mild porting Good video

Happy New Year 🎉

I have done two ms271 so far and they are running better then new. The sound is even more awesome. I am worried about temp on one but i dont really know how hot is to hot yet. But so far i have had great results.

I see why u needed 2 pistons lmao let your saws warm up dude.... come on killing me. Haha

pop up piston, wich one did ya use? greetz

How do you secure the round to the stand.

man that first saw is TIRED.... look up 2 stroke cold seizure and you might then understand why pros always allow their 2 strokes to warm up before running them wide open haha