My limbing and trail MS170 won't idle and shuts down. Starts easy and runs at WOT fine. The idle screw does nothing to increase idle. Clean filter. New fuel. Plug clean and gaped. Fuel filter clean. Carb cleaner (brand ) ? Rebuild the carb ? Throw it out ? Help.
Broke linkage or came apart. I have a 170 also and the choke linkage broke once, it has a cheap plastic base. "I" would take it back to a dealer to fix...
Will check the choke linkage. Yes, it idled fine until yesterday without any adjustment. Sudden, yes. My Stihl dealer is excellent, but its a business. He needs to make money and I like to try to DIY. The saw is at least 12 years old used hard in blowdowns and trail work. Thx. P.S. Maine has the highest per capita gun ownership AND the lowest crime rate. Don't come.
Gain access to the carb . Is the idle adjustment screw actually causing the throttle shaft to rotate when you turn it in, or out ?
Just a response to the WeldrDave quote. Not down the road...not to worry. Back to the real world-----MS170 idle problem may be solved. Bruno ( my local logger/mentor ) said to pour some brake fluid into the carb. Shake it around then drain completely. I did follow Msr. Bruno's directives. It worked ! He gets a beer. The idle screw still doesn't do a &%$# thing. But the little baby runs.
Neither did I. Brake fluid is another solvent like Gumout or Seafoam etc... YMMV. It was on the shelf. Nothing to lose by trying BEFORE a carb rebuild. Those carb parts are tiny tiny with thick screwed up fingers I slip and slide with the carb parts. And, I forget which goes where in spite of ordering them on the bench top AND taking pics.
Something that works very well for me is to take the carb off and let it soak overnight in Pine Sol. Pine Sol is a great cleaner and does not harm plastic and rubber. Q~
Pine Sol is supposed to work in toilets ? Hey, the brake fluid flush did the job. The suggestion was from a local pro logger; knows his stuff. So, if I have to later rebuild the carb, so be it. I'll save the Pine Sol for our latrines.
