OK, so ya'll wanna know why the stupid palms corrode the living chit out of saws.
Wait till ole mate sees it first hand, he'll freak!
Palms hold a lot of water, unlike trees the entire thickness is working wood, no deadwood or heartwood, all vascular bundles. (So I suppose you cant ringbark a palm)
When you cut palms the saw dust is like wet lawn clippings. Sticks like mud to a wall. Unlike proper sawdust it behaves like playdough, moulding itself to every nook and cranny, hole, divet and gap. It forces it's way into the brake band recess, the chain brake covers are no guard either and it gets in there too.
Then a transition occurs, a very quick one. The wet sticky crap changes it's PH and starts going acidic.
You can buy palm sugar, and palm vinegar. Whilst I'm not a
oenologist and understand the entire process I do know that the sap becomes acidic. In fact some research has found that the PH goes from 6.5 down as low as 3.2 over 48 hours.
Now the acidity seems to react with the saw casing. My hunch is it reacts more so to the magnesium than the aluminium.
The reason I think that is because a lower quality cheaper saw (Echo 350T) actually stood up to the corrosion much better than Stihl or Husky. I think the Echo has less magnesium, there's a distinct difference. On the 350T the oil pump was fully exposed to palm juice for 18months and was hardly pitted. Meanwhile with the Stihl 44's the oil pump is somewhat hidden but would heavily corrode. In fact changing oil pumps is a regular thing. I have always a brand newy in the toolbox.
On the 200T the oil pump is hidden a bit but the ass end of it gets corroded away, I used to change them but found they actually keep working ... sort of like looking at the terminator with that wierdo eye you see the guts of it! But it still works pumping oil ... eventually it leaks and you get sick of puddles.
Steel parts just get rusty, clutch springs get rusty and break often.
Palms suck! You may think some are better than others but when it comes to corrosion there's no difference. They'll root ya chipper blades in no time too and you better clean out and oil ya chipper after a decent session.
Many varieties are just evil little chits on sticks that need culling, LA has smelled the roses and is gonna start mass culling.
http://www.arboristsite.com/showthread.php?t=39999
And to settle the tree huggers down replacement planting with better things is the go. Over here palms were simply overplanted and in the worst spots ... my record was 76 queen palms cut down and stump ground in 1 house and took us a week. You just wouldn't plant 76 full blown trees would you? There are many varieties and some are nice and some stay small but so many bad ones are sold it's not funny, the queen palm is banned here now.
Hope that helps. And I allocate special saws to palm duties and the 46 and 66 never ever cut palms! And I've had them for years.