The reason it comes with a spur drive is because you can't get a 6-pin rim. On a stock saw, I would not go to a 7-pin. Also, there's nothing wrong with PS3, vs PS. It's fantastic chain.
You will at a minimum want to mod your muffler ASAP. That as well as 6-8* of timing advance make a BIG difference in how the saw runs.
You will at a minimum want to mod your muffler ASAP. That as well as 6-8* of timing advance make a BIG difference in how the saw runs.