Inside the "Triple Nickel"

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These saws are a little different than the older saws. They operate on velocity rather than volume. Brad is on the right track.......trust me on that. I've done about 50 562s and a slew of 550s.
I'm fully aware it's high speed, high pressure operation, the transfer design is designed to feed from bottom to top with as little turbulence as possible, but I feel that the design lends itself to heavy coking, after 40 hours I had 1mm build up of carbon in the exhaust port, even with alternating to aspen!
Another thing is, the mufflers are so blocked up it causes crank heating, which causes the oil galleries to warp and split.


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Randy modded my yeti,
And Brad I missed my 150 today was out cutting more wood missed the FedEx guyimage.jpg
 
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I'm really diving into this head long. Randy is sending me a set of 562XP transfer covers. I'll throw those on the 555 and re-test. I just bought a new Jred 2260 and will then throw this topend on it to see what difference the crank stuffers make. A man's got to do what a man's got to do, lol.
It's pretty cool to see your testing all those variables independently. I think you will learn a lot about what makes a difference with these 5 series saws.
 
Hey Terry/Randy, have you tried a little timing advance on the 555/562? I normally wouldn't on an AutoTune/MTronic saw. I wonder if the RevBoost coil in the 562 runs a little more timing than the 555. It's driving me crazy wondering what this saw needs.
 
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