mitch95100
Saw Nut
Does anyone know What are the general tuning specs for the Stihl Ms 660? Looking for the RPM specs for full and idle
Thanks
Thanks
Some loggers don't like to run 14,200 RPM on their 660s. I usually set them back about 13,400 RPM for the guys running big bars. It could be that they want more life out of the engine and are afraid to run them higher for fear of premature burnout. Who knows? I do what they want. Idle at 2,500 RPM seems to keep the chain from creeping very much and the engine will hold it.I have my idle set @2870 and high rpm @14200.This works for my conditions fine.
Some loggers don't like to run 14,200 RPM on their 660s. I usually set them back about 13,400 RPM for the guys running big bars. It could be that they want more life out of the engine and are afraid to run them higher for fear of premature burnout. Who knows? I do what they want. Idle at 2,500 RPM seems to keep the chain from creeping very much and the engine will hold it.
Good discussion here.
Forget the tach. Learn to tune the H needle by ear. That way you know the saw is getting what it needs.
Not on a 700 dollar saw
Ill take a vid for you guys and you tell me if its right ill try my best!Tuning by ear is the safest, quickest, and cheapest method going, as long as you've learned what to listen for?
hi guys sorry to interupt but im new on here and struggling to open a thread but i am currently running ms650 that was piston damaged wen i bout it so i rebuilt it with a ms660 pot and piston with no gasket for a pinch more compression but i just a lil conserned on wether i need to change the the jets or not ?? i know you can alter the mixture a little . any feed back would be great thanks rich
Under no circumstance is a dead stock 660 going out of our shop above 14k. With out knowing the quality of fuel/mix and care and useage that the average joe is going to be doing it is a recipe for diasaster/toasted saw. I always use a tach for a baseline, and then clean it up by ear if needed. There are a few on here I would trust tuning without a tach but I'd say 90%+ couldn't guess within a 1000 rpms, it is an art that comes with expierence and years of doing it, not something the occasional user should attempt. It depends on the saw but idle is usually set somewhere around 2750-3100, and we won't send them out above 13,500.
We've got one or two customers that get them set around 13k, but it is due to how they abuse the heck out of the saws and the cheap gas (test 13% ethanol) and cheap mix they use. When tuning for Joe Public, you tend to tune on the conservative side. My saws are a whole different tuning set up because they get 91 octane non-ethanol and Ultra and air filters are cleaned after each use, sharp chains are the norm, not the exception.
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