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I don't know. Just what I've hear about de-comp valves around here. Might not be true. I've experience a loose plug in a saw, and a decomp valve not shutting properly (bent). I didn't notice any damage overall. I don't understand how it would run into a lean condition, but that's what the...

What happens with the air leak? Any leaning out? I've always heard people talk about a faulty decomp valve burning the saws up, so some pro fellers put a bolt in the hole. A feller's old 460 I have came with a decomp valve.

If I had a defective valve that can burn up the saw, I'd buy a new one. They are cheap and easy to replace. First sign of trouble, I would not put duct tape a on tire.

What? The guy who did/ does Granberg demos says milling in the rain keep the saw cool. Kevin, I think is his name.

I've been wondering about this jerk-back phenomenon Most things point to premature ignition and backfiring (offset flywheel with sheared key, coil starting to fail, etc). https://arbtalk.co.uk/forums/topic/58124-pull-cord-kickback-when-starting-a-stihl-ms-660/...

Your shoulder will like that. The rotational speed isn't that high, is it? Might need a one-way freewheel, like a ratchet, or grind a socket somehow to sit release. Maybe 088 shoulda had a kick-starter.

Can't you fab an electric start that will grab the flywheel nut through a custom opening?

I know the pull/ jerk you mean. Rescue saw starter handle or homemade starter handle. Might even use a stopper knot to keep from rewinding into housing, with another knot for the handle. Could be a knot forming an eye. Removable handle could hook the eye, if the handle is in the way while...

Pull out until pawls engage, then yank. Its a machine. Do you need to maintain anything? Why is is hard to start?

With smaller saws, a crotch on a downed branch or a brush pile. If on a log, a small saw will sometime land sideways, so plan properly, and do it safely. A point well made, B. Thanks for mentioning.

My MS261 has one. I use it. Electric start would be sweet. I think that "roll starting" is easier on the shoulders. Its where you rest the bar on the log (nose obviously clear of kickback hazards), and you push with the pistol grip, while pulling the starter cord.

Thanks. My shoulder says it wants the valve. Will definitely get to the root of the problem before repairing. How does one test seals/ leaks. My guess is still the carb. The cylinder is badly gouged in one spot from the ring.

I don't mind paying more the better quality on a money-making tool. Seems like the time to ship to a builder. I'll start a thread.

Carb hasn't been opened. Sometimes, when someone needs a dying tree removed, they'll ask why its dying. If i don't have time, I'll tell them I could diagnose that for them if they'd like, but ultimately, their tree has to get taken down (the one lone tree that won't have disease vector...

Thank you.

Thanks. Always Silver HP ultra. I cut sharp, unless I'm root pruning, but that's not 660 work, clearly. I have employees, so... Skimmed a video. Doesn't look that hard. What kind of replacement cylinder is recommended? This saw was woods-ported at Madsen's a long time ago, when new...

Carb is off, but don't know if it was opened. I'll be interested to see if the diaphragm is damaged.

I wondered if they were blowing smoke, too. I can't see anything wrong with it. I figured I'd get some good experienced advice here. I agree its likely failed from running lean, just not sure why. Seems like diagnosing a seemingly good decomp I wondered if it had the carb go bad, and run lean...

The dealer mechanic told me that my ms660 decomp valve was leaking, resulting in a lean condition. Not in any way noticeable when disassembled. Snapped open, snapped closed. Maybe it needs to be harder to pop closed. Dunno. Didn't know it could be seemingly fine and be faulty. The piston ring...