Well, to update this.
I am done with this Echo. It's just crap.
Anti vibe is a joke, a Stihl from the nineties is better.
The chain tensioner in the side cover is really starting to bug me.
The fuel caps are not locking, I lost an oil cap somehow.
The captive bar nuts are useless. Both springs just deformed and popped out when tightening. They'd have been better off just accepting that Stihl had the patent and having loose nuts.
It feels nasty to hold.
The felling lines are so vague as to be nonexistent.
Parts take weeks to get. My dealer carries every single Stihl spare on the shelf. Chainbrake band for the Echo? Four weeks.
Even when warm it's taking three or four pulls to start. As it's main job is to sit in the digger and be started when I fell a tree and again once I've dragged the tree to the fire, this was getting annoying.
Seems to be down on power from when it was new. Plenty of compression and filter is clean- maybe carb. I know I could probably just adjust the carb, but...
The final straw was when the steel plate between the bar and the oiler/saw body just splintered the bottom bit off when running. Blunted the chain and just say there hanging out the bottom the rest of the day waiting to slice me.
I was so fed up with it that I ordered a new MS261. No idea when I will see that, but I borrowed my old MS241 back to see me over on this job. It really hit home how much more ergonomic it is. Felling lines you can see. Locking caps. A starter handle that pulls over effortlessly without jerking my hand. INBOARD CHAIN TENSIONER!! (no idea why that's such a bugbear for me but I can't stand outboard clutches or tensioners). Starts first time. Running a little rough (not been used for months) so gave it a thirty second rev up, the MTronic did it's thing and she started to fourstoke nicely at the top end. The handles are so much more comfortable to hold. A single captive bar nut that works perfectly. I really noticed the slightly less weight. Single touch kill switch that auto resets. Sounds silly but it's the little things that really make the difference.
So I had a ring around and found what must be the last MS241 in stock at a my local tractor place, they are sending it down from another depot. It's come full circle-like a beaten wife, I'm back to an MS241 and will alternate between this and the coming MS261 depending upon the job in hand. I did appreciate the extra power the Echo had, but it wasn't a good enough trade off and the weight was between a 241 and 261 anyhow. So I shall have both.
My updated advice is- don't bother with the Echo CS501SX. It's a throwback to the early 2000s.