Thanks, but you'll see similar carbon buildups on MS170 saws all over the net if you do a google search. You'll also see it on more expensive saws that do have adjustable carbs. I think mine was performing to spec, and with a new (properly tightened up) carb it should run fine.
BTW, I also have carbon stains on my 455 Husky muffler, and that is after careful adjustment of that carb. If you have zero carbon on your muffler you are probably running too lean.
It's possible that the bolt was loose enough to cause it, but you will find that out.Guys, I have not found that an adjustable carb makes that much of a difference on a 2-stroke engine. I had my carbs on my bigger saws professionally adjusted by 2 different small engine workshops, and their mufflers still got dirty.
Please note that since I have lost power on my machine, it's actually been burning white (lean). The inside of the muffler is grey and clean, and the spark plug looks very clean (too clean). This just supports my theory that the loose bolt on the carb mounting was allowing air in. An adjustable carb will not fix this.
Ah well, for a few dollars extra I should have bought the adjustable, but too late now.When the time comes for carburetor service on my MS170, I'm going to put an adjustable one on it and call it a done deal.
Don't get too worried yet, as there may be a pretty good chance that it will work right off the bat. And even if you do have to rejet, those jets shouldn't cost too much.Ah well, for a few dollars extra I should have bought the adjustable, but too late now.
I'd be extremely skeptical about this claim from your dealer. These are the very cheapest of mass produced saws, and I doubt they have any idea where they are going when they are built. If the carbs are jetted differently then they would have different part numbers, so someone who knows Stihl can easily verify it.My dealer and I were talking about these carbs a while back, and that's how I learned about the jets. When the saw leaves the factory, they jet it for whatever part of the country that it will be sold in.
I'm really not sure if that is so, or not. I haven't had any carb problems with mine, so I don't even know if the jet is removable. It just came up in conversation with him. I would really like to know if that is true.I'd be extremely skeptical about this claim from your dealer. These are the very cheapest of mass produced saws, and I doubt they have any idea where they are going when they are built. If the carbs are jetted differently then they would have different part numbers, so someone who knows Stihl can easily verify it.
Edit: The ipl does show fixed jet 0.45 part#1130-121-5604 and high altitude fixed jet 0.42 part#4137-121-5601
As for the filter use oem or just go to the store and get a pack of green scotch bright pads because they cheaper, much stiffer, and filter as good as most aftermarket air filters. You can cut them to fit as well.
if particles are going into the carb through the air filter that won't plug up carb.
This is true. Any saw dust will simply pass through the venturi of the carb. There's nothing to draw them into carb orfices as fuel is coming out of those.the sawdust will go into the engine not into the passages of the carb. those passages are affected by what is in the gas tank.
Definitely.You should have gotten a real one at your Stihl dealer for $21.49
Where is the real one from Stihl made. Steve
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