question about tuning carburetors.

Maui Palm & Tree Care

Maui Palm & Tree Care

Location
Pukalani, Hawaii
i set the L screw rich and the H screw lean. seems like my saw runs better now but im nervous as to when leaning out becomes an issue. is it better to have the H screw leaner or richer? i make transitions between 2,000 feet above sea level and right at the ocean. i dont wanna lean my saw but i also dont wanna loose power. can i have some help. thanks :)
 
You are going to have to re-tune when going from 0 to 2000 feet. Saw will not be getting as much air at the higher elevation and will need to be leaned out for good performance. Leaning out the High side to much is a great way to blow up your saw too. You can use a tach on a stock saw in good running condition or tune it in the wood by ear. Tuning by ear is really the only way to go once the saw has been modified in any way. Muffler mods, etc. Tuning in the cut by ear is not as hard as it seems at first. One thing to keep in mind is that the recommended RPM's are a guideline and are usually + or - a thousand, depending on the brand.
 
If you can tune it properly with then on then there is no need to remove them. I suspect that this is not going to be the case however. From what I read, the newer Echos are set very lean from the factory. I don't have first hand experience regarding this, but that is what is often said.
 
well i tuned it rich since it's a new saw. i used my friends tach and turns out your all right. it was set with the limiter screws all pretty clockwise (lean). factory specs says 13,500 - 14,500 rpms at max throttle. it was set at 15,300 verry lean. i tuned it back to 14,500 and now that it's running richer it has a snappy throttle and doesn't bog down before it starts to climb rpms. also it idles faster and smoother. thanks for the input guys.
 
Glad you got it tuned in good. Just remember to check the tune and change as needed for those crazy elevation changes. For example if you lean it out to make it run well at 2000ft. then use it at sea level the next, you could be on the edge of being very lean. Thats an extreme example but nevertheless.
 
[ QUOTE ]
well i tuned it rich since it's a new saw. i used my friends tach and turns out your all right. it was set with the limiter screws all pretty clockwise (lean). factory specs says 13,500 - 14,500 rpms at max throttle. it was set at 15,300 verry lean. i tuned it back to 14,500 and now that it's running richer it has a snappy throttle and doesn't bog down before it starts to climb rpms. also it idles faster and smoother. thanks for the input guys.

[/ QUOTE ] and hopefully--it didnt do any damage to the piston yet--from running lean---
 
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