Umm.. are you sure you want to invest the time? Coils are getting expensive, as are the fuel lines if you can find them. I just did one up for a member here and it's a neat saw, pulls well with 3/8 LP, plenty of grunt with the reed valves. If it was mine, I'd just hunt an Echo 330T or something along those lines. If I was looking for a piston, I'd look for another saw. I love old Echo stuff.. just getting real hard to find parts for.