I you want to do a v-stack, please dont' cut the cover. They are not necessarily common anymore, and for a guy like me, I prefer to have one. I got lucky and bought a saw that has a good cover, but should I break it, it'd be nice to be able to afford a new one.
I put a new piston and rings in mine and I've mentioned it a few times but here goes:
The piston that mine came with was a bit scratched and i replaced with the only one that I saw available. I bought a VEC (I think) and the one that I took out was a Golf. The castings, right down to the imperfections were identical. The cast name appears to be an insert in the tool and the castings are the same. In order to get the rod to fit, I had to widen the opening as there was mold erosion in the width of the opening and it wasn't machined. I used a coarse flat file and small careful strokes to remove the casting errors and the unit went on fine.
I threw out the rings that came with it and used Cabers for a 395 and OEM circlips. I cleaned up the windows in the piston with a simple chain file.
I replaced my clutch and drum with that for a 395xp. (mine was cooked) Better design and good fit. I believe that the drum kit even comes with a new v-ring. (the seal for the clutch)
I removed the rattle-valve governor in the carburetor and blocked it with some gasket material which allows the saw to rev higher, but also allows for better tune-ability by ear, as I can hear it 4-stroke. (I used a leather punch to get a tiny disk of material under the
I've not run it against a 395, but it's a strong runner for my 3-5 times that I used it per year.
Enjoy,
phill