With a case of CAD I got what I hope is going to turn out to be a reasonable deal on an 066 mag powerhead. It came with a dual port muffler, the factory 3/4 wrap handle, large felling dogs and cover. $350. I put some gas in, cleaned the air filter and gave it a quick cleaning and look over. I ran it for a bit and it runs good, starts fast and has no love for wood. My compression gauge has alwayse been pretty honest in the past and this saw will blow 162 psi. We've cut with it for a few days now, it'll outrun my 064 by a good margin and it'll eat my new 660 with dp cover for lunch.
I pulled the muffler off to blast it, and open up the side port a bit more, and some new paint. The piston has no scoreing but the crown is showing some erosion above the top ring on the exhaust side. It's not bad but I am probably to replace it when I get time to take the saw apart. In need of another project I've been gathering parts at the Stihl dealer for a rebuild/restore, berrings, gasket kit, starter rope, and msc small and worn parts.
Does the baffle in the muffler limit the power? There's 18 holes in it @ .200 diameter. That doesn't add up to enough. Remove the whole thing, just the front or drill holes in the front of it?
What are the thoughts on a Meteor piston vs a OEM piston? I'd prefer to not to spend the extra on an OEM, but don't want something that's likely to fail. I'd hope the Meteor is better quality than the cheaper aftermarket ones. What rings come on the Meteor? No love for the cheap groved ez-break rings. Northwoods saw should have the Metors in stock by now or verry shortly and t would be about $50 after shipping.
Would I see any significant power increase going to a BB kit, vs mild porting the OEM cylinder that I already have and the new piston? My thinking is that I'm better off touching up the OEM cylinder and running it with a new piston.