Looks good. At 2.8 grams a cc and by the looks of it about 2ccs that will make 5 or 6 grams difference to piston weight. Big bore pistons are easily that much mass and work without any noticable balance issues.
A 2 stroke single is only partially balanced so it's not all that critical.
I'd guess the compression will jump about 50 psi by the looks of it. (edit I see thats what it did) Cyl and piston were down 40 psi to start though so fix that up and its going to be well up over 200. might need to shave a little off the top if you want to work with the saw. Also an idea to watch how close the spark plug is to the pop up, get too close and it will turn into a hot spot on the piston.
Timberwolf, you are right on the money! 5.27 grams added weght! PSI gain 55, not sure what stock compression was until after some modding ( because of all you guys, had to buy a comp guage, Mac Tools too) just kidding this is very addictive! I do very much appreciate all your info Timberwolf and rep you for it! People that are willing to go out on a limb and try something new should not be made fun of. I'm sure thats how saw modding started, somebody had to try it. Brad has also been ther for advice on the few threads that I have started, and I thak you too.
Actually got this saw a little warm when it was stock (think thats when I ruined the ring) and tore the motor down (over and over) to see what I could do with this, have ported and raced snowmobiles before so familiar with two strokes and always wanting more power.
Anyway, I know that this is a very small saw compared to most, but, all the better reason to mod it, right?
First started out with a muffler mod.
that was not enough so I ported the exhaust
nope still not enough, tore down again, now intake and tranfers
after more hours on here of reading, tore down carb and ported it
NOW running like a raped ape, cant stop, have cut a LOT of wood through all of these upgrades.
Cannot stop now, I know ultimately I am going to blow this saw up. It's also a cheap saw and I will know my limits for next time. But it has paid for itself for all the wood it has cut and all I am learning. ( Also will be an excuse when it does go down for upgrade!
So here we we are to the piston dome project, have cut down two ash trees now with it running unbeliveable but I think Timberwolf is right, New ring=shaved dome, by the way I did have to relieve one side a little for plug clearance after these pics were taken.
As far as doing a Dome on someone elses piston. I would not have a problem with that as someone asked earlier, but this was my first one. I am a specialty welder by trade ( Aluminum, Stainless, Cast steel, Cast Iron, Brass, Copper, Titanium, Mig, Tig, Arc)
Apreciate everyone input, yes this is out of a Husqvarna 445, just curious what any ones thoughts on the porting? dont have any pics on the transfer internals or the carb, maybe later, probably too square but any input would be great?
Thanks to all.
Rick