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Not alot more h.p. then my 395XP. But when all the heavy innards of that 090 are turning there's lots of inertia especially with that heavy clutch and that long .404 loop of chain turning. Plus the bar nose on that 5 foot bar was a 2 7/8" diameter roller. I have a writeup somewhere in my...

I never have or know of anyone . I remember one of my old Jonsereds had a spur gear sprocket and it danced around for a bit but only damage done was to the drive links on the chain. (Think MS200) By the time the chain hits the chain catcher it's pretty well free of the rim sprocket . Worst...

It's impossible for the rakers (depth gauges ) to ride clear in the kerf no matter how light a feed pressure is applied. When the cutters bites in it automatically rocks back only stopping when the raker contacts the wood., then goes back level when it leaves the kerf. You may have heard the...

Thanks for sharing that Willie. Sam Madsen knew his math as he taught it for years at the local college. His OCD is a bit more severe then mine though lol.

As chain thrown with a 7 pin rim with more torque behind it can do more damage. A 7 pin rim on a 562XP can have as much chain speed as a MS441 with a 8 and they both can do as much impact to the chain catcher. I was on our logging camp's safety committee for 10 years doing monthly inspections...

:thumbup::)

Sean, I've heard alot of slang from the PNW and even out here, but you gotta take it with a grain of salt. What loggers say to each other is like a communial language by saying shortcut slang. What is understood in that circle could be totally misunderstood by some one else.

You were still pissing in a diaper when those saws went out:lol:

LOL, you don't seriously believe that do you?

The increased chain speed of a 8 pin over a 7 is not significantly enough speed for more potential damage. Where the potential damage comes from is from not replacing the aluminum chain catcher when it finally gets cut off completely. There was a time when Stihl realized they had to put a...

Even with higher powered modified saws a 8 pin rim is of no advantage unless you're running square ground chisel chain in a speed bucking competition. Round filed chain takes more power to pull and that's where the lower gear ratio 7 pin comes in....no matter if your running a 18" or 36" b/c...

8 pin will give your 3120 more chain speed but lowering big hardwood stumps I don't see any advantage. My 395XP -32" came from the factory with a 7 pin 3/8". I tried the 8 pin for lowering stumps but quickly went back to the 7. Torque rules in this type of cutting . Here's a video my 12 yrs old...