Building a Poulan 365.

That's great,thanks!! Will try to look at it in next few days.

 

You know Eric all it takes is practice. I tune all my saws by ear. The tach is just for making some comparisons of before and after, but if I am up in the mountains at 7500 feet cutting dead pine for firewood the saws get tuned by ear.

 

I believe there are some videos around demonstrating the 4 stroking sound to the clean 2 stroking sound you get from out of the wood and then in the wood.
I learned by watching those videos and then tweaking the hi jet on my saws so I could duplicate that sound. Then after time my ear became accustomed to what I am listening for.
There is no mystery to it. When saws have become muffler modded the sound becomes more easily heard I guess because they are louder.

 

The low screw you adjust for mixture when the saw is at idle. The high screw you adjust for mixture when at wide open throttle. The third screw is there to adjust what the rpm's will be when at idle.
It is that simple. Sure the low mixture can affect the tuning at wide open throttle but that is why you adjust the low first. You will not score a piston from being to lean at an idle it is at wide open throttle that really counts. If you can hear the engine 4 stroke and then go to a clean 2 stroking sound when you put it in wood under load then you know it is not to lean.

As soon as you release the throttle the high or wide open throttle jets are not even being used. With the butterfly closed there is not enough air passing over the jets to draw any fuel out at that point.

That is why I always start my 2 stroke engines with wide open throttle. It is because the air is passing over all the jets, low and high to draw the maximum amount of fuel out.
Some saws automatically set the throttle to high speed when you pull the choke so you do not have to do it. A lot of older saws did not have that feature.

 

Hey Eric none of us were born with 2 cycle engines on our brain. We all had to learn it just like you will.