Adjusting your 2-stroke Chainsaw Carburetor how to tune by ear demonstrated and explained

Forgive my fumbling trying to find the H jet with a dinky screwdriver.

Impulse Diaphragm 2 Stroke Carburetors

Fat = Too rich mixture (too much gas/oil and too little air)
Lean = Too lean mixture (too little gas/oil and too much air)

[hookeaires]

Without all the fancy video and audio, this man taught me something that is essentially simple, but not so easy to grasp. Saw is running great now. Thanks.

[williamrgrant]

Thank you for such a simple demonstration of (what can be) a complicated and nuanced process.
Hearing the examples of good and bad tune were super helpful!

[amitdesai]

This is a best video on YouTube about tuning chainsaw carb, really helpful, thank you for a

[fairbank]

This method is confirmed in the Walbro service manuals where it states that optimum adjustment for the high speed screw is obtained when a very slight 4 cycle sound at wide open throttle is heard

[cdjxtdn]

No need to apologize for "dragging on, " mate. I didn't find a word you said herein to be anything other than useful. In my experience, our new saws have been fairly well adjusted at the factory, so there's not a lot of need for carb adjustments. When a carb starts to perform poorly, on the other hand, that's when this information really makes a huge difference. We just replaced a Zama that was way too flood prone recently with another Zama. Having no way of knowing how the new Zama was adjusted at the factory, I carefully turned both the Low and The High jet screws full CW to refusal. After that, I followed the service manual's suggested spec by turning the Low screw out (CCW) one full turn and the High screw out (CCW) 1 - 1/8th turns. After getting the saw started, I turned the idle adjustment screw in (CW) to get the RPMs up enough to make a proper Low jet adjustment. At that point, I followed your advice and adjusted the Low screw out (CCW) until the engine just started to "gurgle." After hearing the gurgling sound, I slowly turned the Low screw in (CW) until the engine just started to sound miss free. As for the High jet, I used a hand-held tachometer and set the saw up for the specified max RPM. Regardless, once I was done with both jets, I adjusted the idle speed until the clutch shoes released just enough to stop the chain from spinning at idle. Regardless, I really appreciate the fact that you took the time required to tell the carb adjustment "story" properly and thoroughly - minus the TV personality wannabe hoopla and superfluous pasture patties. If I hear another wannabe saying something akin to "let 'er rip, tater chip, " I think they'll have to come out from the nearest psych ward and give me that long quiet ride to what Karl Childers (in Sling Blade) referred to as, "The Nervous Hospital." Please keep up the great work.

[mikeblunt]

First carb adjustment video I have seen that makes perfect sense easy to understand, , , , thanks!

[garry_potta]

Great video and easy to understand for us beginners. Thanks dude. Just did muffler mod on my ms260 and left the high end just where you said. Saw really rips now!!

[cybu]

This is Good, now my chainsaw is finally working !🎉

[chrisallen]

Great, that’s exactly what I needed to hear. Thanks.

[richardmiddleton]

Another way to check the low is to let it idle for a few seconds then go full throttle quickly, if it bogs or even quits it's too lean. Also if your high is lean it'll take a few seconds to come back down to idle after full throttle.

[RG-wyol]

Thanks for the demonstration of how things work.

[kstuart]

Been trying to tune my ms250 and haven’t been able to get it, but you’re video I think is going to help HUGE😀👍. Thank you for making it.
Super helpful!!

[jimmyscoffield]

Very good video, easy to understand, better than most I've seen

[hoyvintagecycles]

great (basically you need it a little more rich during tuning so when you put it (Under Load) it will run better)

[KarlHeinrichFreimut]

Just beautifully demonstated. Thanks a bunch.

[tylerpearson]

This is a really helpful video thanks man.

[jkjwf]

I have a CS-370 echo chainsaw and it says 30psi on a compression test. I got it to run and cut for about 2 minutes then it dies. I replaced the carburetor. Is it possible I can get it to run without replacing the piston maybe the ring is just locked up? Any suggestions on where to get a good aftermarket piston kit would help. Thanks.

[jamesconn]

Thanks, i am seeking knowledge, been reluctant to fool with the H & L, for fear of ruining my saw .

[TheKelday]

Man this video was so helpful thanks for making it!

[therealRustyShackleford]

First thing I do with a 2 cycle that won’t run is change out the gas.