This quirk has me stumped. I restored a classic old Echo 500 EVL's carb that was running the engine very poorly. It now starts and runs at top end smoothly. Acceleration and power are both fine. Resting on the ground or on a table, it idles perfectly and the chain loop is at rest. When you pick it up by the outer handle, it suddenly adds about 150 RPM or so, just enough to trigger the clutch to start the chain moving. Set it back down, and the RPM slows immediately to the correct idle speed, slow enough so the chain does not move.
I have never run into this with any other saw that I have worked on. and I own an identical saw that does not do any of this. I've tried adjusting all the setscrews (idle, lo and hi) with no luck, so I adjusted those back to the factory recommended settings. Any idea what is causing this strange behavior and/or what I can do to fix it? TIA.
I have never run into this with any other saw that I have worked on. and I own an identical saw that does not do any of this. I've tried adjusting all the setscrews (idle, lo and hi) with no luck, so I adjusted those back to the factory recommended settings. Any idea what is causing this strange behavior and/or what I can do to fix it? TIA.