Recent content by Merkava_4

I actually put the original carburetor back on. I had taken it off because I thought it would not stay in adjustment. Come to find out, it wasn't the carburetor's fault. It was the fuel tank vent. There's no way to keep the mixture settings where you want them if the fuel tank keeps changing...

4180 120 0615 4180 120 0618 Just curious what the difference is between those two carburetors? eBay sellers will list the carburetor as 4180 120 0615 / 0618. I'm wondering if the 4180 120 0618 has the new octagon mixture needle heads. Application is the STIHL FS 91 R string trimmer. The IPL...

- EFSM - hacskaroly - Coupe - lehman live edge slab ThankYou all for replying to this thread. Very much appreciated. :beer-toast1:

I swapped out the carburetor. The new one runs perfect at the bench setting. 1-1/4 out on the L and 3-1/2 out on the H. I'm surprised it runs so well at the bench setting but I'll take it. Thanks for all your help EFSM. You're one smart cookie. :thumbsup:

That's exactly what's happening. But if I lean out the high side so that it doesn't die on deceleration, then it's not rich enough to get to full throttle under load. I've been running the high side rich so that I can go max speed at full throttle in wet tall grass. It might be time for a new...

FS 91 R 4-Mix. Run perfectly fine and runs strong. Let go of the trigger and it dies. Starts right back up on the first pull and idles fine. Put the trimmer back to work and it dies when letting go of the trigger. Rinse and repeat. I'm at a total loss as to why.

I bought this clutch drum off of eBay on 05/27/2025. Already the bearings feels rough and are making noise. Are the bearings proprietary to Stihl, or can I replace with industry standard bearings? There's video on YouTube that explains house to change the bearings on an Echo clutch drum. The...

ThankYou Ray ! You're always my hero ! :)

I have the service manual, but it loads without the illustrations. I think it's corrupted or something. The part# for the manual is 276781. ThankYou !

ThankYou !

I have the older version which is the 4mm hexagonal 5910 890 2307. Is the octagon 5910 890 2314 also 4mm? Not that it matters. Just curious.

I think it's the 40:1 that's killing you.

Just to update this thread again, I've been using the Pyramex shield and making sure the clear visor touches my chest. The NoCry shield is lighter and more comfortable, but I can't use it for string trimming because it has no tilt stop adjustment. A lot of the debris flies straight upwards and...

I was thinking maybe some of them might be a plastic mesh like they have in some oil filters.

Do you guys wear safety glasses under the wire mesh; or don't you think the wire mesh protects you good enough by itself?