MS193 won't rev, drooling gas when running

sprucebunny · March 09, 2021, 06:21:49 PM

It sat several months and now it doesn't want to play.

What should I look at first ?

Thanks

donbj · March 09, 2021, 07:33:20 PM

Probably needs a carb clean. Needle valve not seating properly and flooding is a possibility

sprucebunny · March 09, 2021, 08:12:32 PM

Thanks. I'll try that.

I use no ethanol premium gas and the Stihl Ultra oil ... I was relly hoping my chainsaw gas problems were over.

donbj · March 09, 2021, 09:21:40 PM

I run premium non ethanol too and always put seafoam in as well. It works well for me. I try to fire my saws up fairly regular as well and not let sit for months if I can help it.

DHansen · March 09, 2021, 09:29:10 PM

Is it safe to add seafoam to the fuel on a 2 stroke?

Tacotodd · March 09, 2021, 09:37:32 PM

Not in place of regular saw oil. I would think that a SMALL amount, like 200-1, should be OK. Such a small amount shouldn't even require a "re-tune" of the saw.

Well, maybe a tiny amount. But not much.

DHansen · March 09, 2021, 09:39:39 PM

I like Seafoam and it is a good product. But it is a cleaning solvent and contains isopropanol. So it is counteractive to the oil mixed with the fuel. I could see a small amount not harming the engine. But a steady diet?

Tacotodd · March 09, 2021, 09:45:33 PM

Not steady, only occasionally. Otherwise, you'll be running ethanol fuel and it's related problems. Run it completely out of fuel when you're done with it . Otherwise, well, you've been here before ....

DHansen · March 09, 2021, 09:55:04 PM

I believe Seafoam has 14% Isopropanol. So it comes down to how much you add to each gallon of fuel. But it defeats the purpose of buying Non-ethanol blended fuels. The Naphtha in the mix would be counteractive to the oil in the mix. I could see running Seafoam in a 2 stroke if you were attempting to clean up carbon deposits in the combustion chamber or having a carburetor contamination issue, but at what ratio and is it worth the risk of lubrication failures? Easy enough to remove and clean the carburetor. Or inspect for carbon fouled combustion chamber.

I'm not saying its a bad choice, but just trying to understand the pros to adding it to the fuel supply on a 2 stroke.

sablatnic · March 09, 2021, 11:27:59 PM

Drooling fuel? How, out the intake? How is the spark arrester??

donbj · March 09, 2021, 11:41:53 PM

Ethanol fuel at 10% is half a litre in 5 litres of fuel. The ratio of seafoam recommended added as stabilizer is almost insignificant in a non ethanol fuel. Just an opinion. I've had good results with it.

sprucebunny · March 10, 2021, 07:06:29 AM

The fuel is drooling out by the sprocket. The muffler thing looks slightly oily.

I did happen to put a half capful of Seafoam in it to try to clean the carb. Didn't run any better. I'll try it again this afternoon before I take anything apart.

The other saw just like it which is a year older has been sitting even longer but it started up and runs just fine so I can finish whacking alder before the ice gets weak.

Guydreads · March 10, 2021, 11:37:53 AM

That sounds pretty bad. Sounds like one of your crank seals is out. Probably clutch side. Maybe I'm not understanding you correctly

Tacotodd · March 10, 2021, 12:21:17 PM

I'm inclined to agree with @Guydreads

donbj · March 10, 2021, 12:54:25 PM

Quote from: sprucebunny on March 10, 2021, 07:06:29 AM
The fuel is drooling out by the sprocket. The muffler thing looks slightly oily.

I did happen to put a half capful of Seafoam in it to try to clean the carb. Didn't run any better. I'll try it again this afternoon before I take anything apart.

The other saw just like it which is a year older has been sitting even longer but it started up and runs just fine so I can finish whacking alder before the ice gets weak.

Well that changes things. I assumed it was drooling out of the carb, darn assumptions :D

Tacotodd · March 10, 2021, 01:35:59 PM

Seafoam has to have time to "chemically" work. It slowly softens carbon which causes it to release upon vigorous and "excited" running, like in an engine piston. And in turn, combustion chamber. It also cleans out the fuel system by doing its best to keep everything spotless. But I still wouldn't run it all the time. Just about the capful once a year.

btulloh · March 10, 2021, 02:13:34 PM

Good info on the seafoam. Thanks for posting that.

sprucebunny · March 10, 2021, 04:42:51 PM

I've decided to replace all the gas. I don't like the looks of the one gallon container that is about full. Like it hasn't enough Ultra in it.

Need to drive a couple towns away to get the no ethanol.

Used a Milwaukee cordless sawzall to whack alders today

It's not as fast at all but I don't have to wear chaps. Weight is about the same.

Guydreads · March 10, 2021, 07:12:10 PM

Um. Changing your gas is not gonna fix a leaking crank seal btw. Like bad gas isn't gonna just seep through the seal cause it is bad. Just saying, before more damage replace that thing.

sprucebunny · March 12, 2021, 05:07:14 PM

It was the spark arrestor. About 80% plugged up. Got that clean and new fuel and it runs fine again.

Thanks, @sablatnic and everyone else for your ideas.

sawguy21 · March 12, 2021, 06:44:05 PM

:D The simplest things can drive ya nuts.

sprucebunny · March 12, 2021, 08:35:08 PM

I knew my MS180s pretty well. The MS193 and 192 are a different format. I haven't had a bit of trouble with them until this so don't know thier little problems.