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Hmm... Crickets...I don't know anything about the 650. I have an 064 that needs rebuilt. It's been a good saw. I bought it used for $375 a little over 10 years ago. I normally ran it with a 28" bar. On the 064, I think you had to re-drill and tap the mounting bolts for the cylinder to convert it to an 066. The bolt pattern is the same, but the 066 used a slightly larger bolt. I don't remember the sizes. I'm not sure if the 650 compares or not. My understanding is that the week point in this conversion is the pin on the crank shaft. It's not as big as the one on the 066. Not sure how big of a difference that actually makes. When my 064 went south on me, I bought a G660 (066 clone). I was working on a big oak in my back yard at the time. It was over 5' across, and I needed something fast. The G660 arrived in 2 business days. I've been running it ever since. I keep looking at the 064 sitting on the floor in my shop thinking that I should rebuild it, but I just haven't been motivated to do the work. My G660 will run my 42" bar, and with the 28" bar, I've never been able to stop the chain unless I'm noodling and I get the clutch area packed full of noodles. As far as working over the 650, I'd start by opening the muffler up if your buddy hasn't already. Beyond that, you're probably better off shipping the saw to someone who does saw mods for a living. I've never had any of my saws ported so I don't really have anything to base any recommendations on.
Hmm... Crickets...
I don't know anything about the 650. I have an 064 that needs rebuilt. It's been a good saw. I bought it used for $375 a little over 10 years ago. I normally ran it with a 28" bar. On the 064, I think you had to re-drill and tap the mounting bolts for the cylinder to convert it to an 066. The bolt pattern is the same, but the 066 used a slightly larger bolt. I don't remember the sizes. I'm not sure if the 650 compares or not. My understanding is that the week point in this conversion is the pin on the crank shaft. It's not as big as the one on the 066. Not sure how big of a difference that actually makes.
When my 064 went south on me, I bought a G660 (066 clone). I was working on a big oak in my back yard at the time. It was over 5' across, and I needed something fast. The G660 arrived in 2 business days. I've been running it ever since. I keep looking at the 064 sitting on the floor in my shop thinking that I should rebuild it, but I just haven't been motivated to do the work. My G660 will run my 42" bar, and with the 28" bar, I've never been able to stop the chain unless I'm noodling and I get the clutch area packed full of noodles.
As far as working over the 650, I'd start by opening the muffler up if your buddy hasn't already. Beyond that, you're probably better off shipping the saw to someone who does saw mods for a living. I've never had any of my saws ported so I don't really have anything to base any recommendations on.
