My newly ported cylinder (Big Bore #5) came to life today.
I was not real impressed with how Big Bore #4 ran, the port timing #s were not that great (Ex at 95), so today I ripped it down and put my "re ported" Big Bore jug #5 and an OEM piston on frame #4. Squish with the OEM piston went from 0.20 (with the NW piston) to 0.17 with the OEM piston.
I could not believe how clean BB #4 P+C were! The pics of the cylinder did not come out, but look at that piston, and I did not clean it at all!!! Looks like I took it right out of the box!
These NW BB pistons seem to be of good quality, and weight the same as a Meteor, so I think I'll save them for some 460 projects and use the lighter OEM on my Hybrid and BB kits.
I let the sealer dry for 2 hours then started her up. She kicked on the 8th pull (just enough pulls to make me nervous), then started right up and ran very clean. Minor adjustments to the low and she idled real nice (with the Lo screw about 3/4 turn out).
She ran good. I'm neither disappointed nor ecstatic. I'm not sure if she has the RPMs I was hoping for, but she has good torque, and when you lean on her (noodling Oak) she just slows a bit but does not stop. I like that in a saw! Heck, it does not even have a third of a tank through it yet, so it may break in a bit, and maybe RPMs will increase if I lean her out a bit, but for now I want it to be a bit rich. The saw was well mannered, idled well, re started easily several times, and did what it was supposed to. Also, it has out of the box RS on it, and I'm used to running square file.