Stihl MS180 fuel mixture, fixed jet carb?

[dsell]

I just made several searches on fuel mixtures and carb settings but didn't hit what I wanted. I have ran my MS180 through quite a few tanks of 32:1 fuel. I changed the bar and chain to .050 verses .043, and the saw has been a dog ever since. However, the chain is 10 times better. I decided to mix the fuel according to the manual, 50:1. I took it out yesterday to cut a load of hedge and it ran exactly the same on the 50:1. It is amazing to me the carb adjusted to that automatically. How is Stihl doing that? I seen one post that referred to the carb as fixed jet, but I don't see how a fixed jet carb could compensate for different oil mixtures. I'm just using the MS180 for back up and cleaning off the branches, it's easy starting and very light.

 

[Lakeside53]

It didn't adjust. You just think it did.

 

[dsell]

So, the carb is fixed jet and there's no magic? By the way, the tank repair on my 028 is holding great, thanks.

 

[super3]

Switch to Bailey's 34LP and it will be a lot happier.

 

[biggenius29]

You are also running a leaner mixture, that could also be why it seems to run better.