Tuned them by ear...Perfect!!

[kodiakfisher]

I finally went to my Husky shop and had him check my two saws. I rebuilt a Mac 4900 and cleaned and tuned (muffler mod) a Husky (Poulan) 142. I was curious how close I was on the carb adjustment. Mac 4900 was supposed to tach out at 11500, I was 50 rpm above or below depending on when you looked at the tach. The 142 after muffler mods was max at 13000 and mostly sitting at 12948, the guy said "just where you want it", He wants me to burn that 142 so I will buy another real Husky from them. I bought my 357 from them. Anyways He says I don't need him to check my saws all three where within 100 rpm of spec. I will be backing the 142 off to 12500 rpm.


BTW thanks for all the help after listening to you experts talk about how to tune by ear IT WORKS. I will assume have my saws close to max rpm at sea level will richen them up just a touch when cutting at 2500' to 5000' elevation which is fine with me.


Kodiakfisher

 

[fishhuntcutwood]

Tuning by ear, or in the wood, is the way to go. I was hesitant in first trusting myself to do it, but once you get the hang of it, like alot of other things, it gets easier. I'm no expert at it, but I get better each time I do it, and my confidence grows.

Good for you!

Jeff

 

[Lobo]

However when you have hearing loss you are better off using a tach.

 

[West Texas]

Come on Lobo, I expected you to say, that the ear method is only valid "IF" you have a sharp chain.

 

[Mange]

Why can you not tune with ear protection? I do that.

I do not think saws can be tuned by a tack to same rpm's as a rule.
You can have 3 identical saws and they have different perfomance. It is not by the thousands of rpm's, generally, but in in some cases it is.

I have 3 154sg here, all at different rpm's, but all perform about the same.
My naibur has 2 357xpg that has run same ammount of hrs, they too are different in rpm.

 

[cbfarmall]

However when you have hearing loss you are better off using a tach.

I have significant hearing loss (ear infection) but I can still tell a blubbering engine from a lean one. And I do have a tach but so far have used it for novelty purposes more than anything else. Guess what, my Homey 2100 peaked at over 10,000 rpms.

Chris B.

 

[Al Smith]

I have only used a tach one time.That was to check an old McCulloch 650 geardrive that I thought was running real fast for it s age.It was,9,200 to 9,700 in the cut.
I usually lean them out to max then back them off until the first "blubber".As a rule the blubber turns into power in the cut.
Perhaps the saw manufactures give an rpm to provide a standard they feel is safe with regards to lean out conditions or throwing a rod?