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Dealers are often told what to say and think even. Brands teach them what to say if product fail. Often its operator or fuel, settings was popular to put blame on until they removed setting screws. Now they find something else to blame. Lean running saws is saws that run hot from not enough...

Loosing compression is not like a air leak. You still have lubrication and correct fuel mix. It will loose power and could have bad idle. I did this a few times. It feels hollow and sounds different. Put it to wood and its powerless. The 357 and most non X-torq saws with decomp at side has a...

If valve is defective it will loose power, run as plug was loose. In itself it can't destroy engine as it can't fall in as hole in to cylinder is just 1,5mm in diameter.

Wash it in petrol. I bet its sticky from oil.

I have sold HVA decomp valves to a hearley builder here. They broke starters as the comp was a tad high. starting with decomp valves saved starter and happier custemers. He must have bought 50 or so by now. Its two every build...

Larger saws I pull with two fingers so I don't hold to hard and get arm broken. Jonsered XF was known for braking of under arms. I had enough pain to listen so two fingers it is. If handle don't allow this I hold it further out on finders and not in hand. If they backfier it pulls handle out...

The technolegy has been there all the time. The project manager at Husqvarna said he thought it was silly to have a decompression valve on so small engine as the 2100. He changed his mind after he ran it a couple times he said. Quote "I promiced the loggers next model should have decomp valve...

No, there is a tension washer I think. The Sweden made Companion MS1 had decompression valve in late 50's. Many saws with larger engines had them before this. 1916 The Sector saw was made and it had valves to open and give it a little schnapps before cranking as well as release a bit pressure.

Its not just to drill and tap a 10mm hole straight in cylinder wall. Hole to chamber were decompression valve sit in cylinder is 1-1,5mm. If its bigger flame can get in and create heat. It takes a bit practice and very good drills to do this right. Not all you can do it on even if it looks possible.

When running saws I try to use it as often as possible. Its there and help you and saw, why not use it?

If it closes its closed positive pressure will keep it closed and if spring is good it will hold it closed when there is negative pressure. Easy to test. Stick it in your cookie trap and suck. If you can't get it to open its likely ok. I seen many valves gone bad over the years. This was a...