Can you explain what free porting is ,and why it is bad ?I should also head a warning not to touch the bottom of the exhaust port. This saw is right at free porting with .023 off the base.
Thanks ,makes sense .go too wide like the old days woods ports and the piston will not last long .Free porting is when the bottom of the piston goes higher than the floor of the exhaust. So in essence when the piston is at TDC and you look into the exhaust you can look into the cranckcase. I've seen arguments both ways some say a little free porting is ok. My main concern weathers its ok or not has to do with the longevity of the motor. If your free porting and have the exhaust ported out big the piston can actually rock into the port causing premature ware on the bottom of the piston skirts.
You won't be disappointed!That's what I was going to try on a couple.
Thanks brad. This is jar944 thread link.
I drill my bar out also to help even more.
Carl, experiance the mod on my 7900 I sent him, and he could see a difference and asked about it.
Like Nate said it's sure worth a try since it's pretty easy to do!!
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if i remember right jared didnt think just doing that mod alone would result in more oil flow but rich and me both experienced some gains from it. not much but since its an easy thing to do it is worth doing.
Thank you my man. Always glad to have more input!Yeah after hearing about the positive results of just modifying the rotor, I went back and looked @ the adjustment "screw". i dont remember the specifics, but you will get more pump displacement with just the rotor mod.
alternatively you could drill out the screw "nub" and epoxy in a short section of tig rod to make it a bit longer (and wear better) just grind it to the length you want.
Thank you my man. Always glad to have more input!
your phone was probably blowing up from all the people mentioning your name. You ever decide on a mill?No problem, glad I could help. With a 20" bar and the pump set to max, it looks like the Exon Valdez ran aground on the bar.
Also you can easily use all the oil before the fuel runs out, so be mindful of that if you set it to "11"
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