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Thank you! That explains what I'm experiencing and corrects my misunderstanding.

My understanding is opening the muffler to 80% & advancing the timing work together, one without the other doesn't help much, and how much it helps depends on how restricted and timing retarded the saw is. You might want to find information from a builder like @huskihl using Search regarding...

I've run into a few people in life that take advantage of others any way possible, no matter how little the benefit to them and how negative the impact on the other person, either because they can or because they derrive pleasure from screwing over others...maybe the homeowner was that type of...

Sometimes people have earned a particular outcome; unfortunately not everyone is a good person and life balances out for them a little. Maybe this was one of those instances and @Chucksta was part of a bigger picture... if you've heard people ask why life is so unfair, perhaps this is one type...

Look for piston and cylinder kits: https://www.sawsalvage.co/search?q=ms261 Because I've posted a link to AM parts I'll note that builders have said go with OEM vs. aftermarket because the quality on most aftermarket is usually "messed up," getting a cylinder with the ports in the correct...

For brush and dirty wood I use semi-chisel chain, for dirty big logs chipper chain. It's rare I get clean wood and run full-chisel unless experimenting with filing profiles on a log reserved for testing. If factory angle is 30° for the top plate I file a few beat up chains to 25°. File height...

ECHO is a great homeowner saw when you want a lot of value for the money. Parts and shop manuals are available online, unlike the other two major brands, so repairs can be made by the homeowner if needed (like a brittle fuel hose due to age and ethanol in the fuel). There are tradeoffs with...

I've noticed the old Homelite hardnose bars (no sprocket) are very rounded over the length of the whole bar. Current STIHL hardnose bars are similar. I would guess this optimizes the chain path and cuts wood faster, as years back material was affordable and productivity was a major focus...

There are other factors one might consider depending on need. An MS362, MS400, MS462, and MS500 will all buck a 22" diameter log with a 25" bar. A 28" bar will heat the nose sprocket less and the extra cutters will likely keep the chain sharper, longer, so the bar sprocket will last longer and...

The carrying cost for multiple items is more than for fewer items, so the dealer makes less profit by inventorying more items and requiring more shelf space. It also adds to consumer confusion which is a negative impact on sales. One can guess that stocking more items results in more sales, and...

@redbull660 apparently migrated to what one might term "the rebel site." Around the time he left ArboristSite he was interested in saw modification, and a bunch of hotrod saw guys are there, so perhaps that's the reason, I don't know. There was a bit of contention here around that time with some...

The adapters are hollow. I'll post a better picture tomorrow.

The bar from the 025 has an older style marking, the 3003 as you call it a more recent style marking. Both are what STIHL calls 18" bars due to industry marketing convention, and yes, it is confusing at first as some bar manufacturers use a different number for the same length bar. Look at the...

Fortunately chainsaw sparkplugs seem to be bigger than the adapters' sizes (meaning the supplied hoses fit different chainsaw spark plug sizes), but there are indeed small spark plugs in the wild and small engines that use them.

That brings up another correlation: Bar weight verses cutting speed. The lightest bars tended to cut slower, a somewhat heavier bar faster, and the heaviest bars slower. Factor in available power on tap depending on the powerhead and bar length, and a pattern seems to emerge. I think it's...

I'm re-reading several of these old test threads by @redbull660, good stuff. The IR readings are...well, possibly wildly inaccurate. NOT to criticize, simply for education on this one part of the testing: Since the emissivity is below 0.50 the measurement is going to be inaccurate regardless...

The hoses have valves at the cylinder end, the adapters do not as there's likely not enough room in an adapter for a valve. (Mityvac MV5530, click image to enlarge)

Each of the four hoses and if I remember correctly the four adapters also have a Schrader valve at their ends; I had wondered the same thing and was impressed with the set. If you want I can look tonight.

The problem is likely that on a small engine the cylinder volume where pressure is built is relatively small (at least compared to a car engine). The compression tester hose increases the cylinder volume significantly, and as the piston only displaces a small volume the pressure that...