Stihl MS 150C - Will not rev.

[spudulike]

I usually open up the hole that you can't get to and also do a single "louvre" muffler mod. You basically cut a slot in to the part most people drill a hole in to do the muffler mod.....and burn a hole in the exhaust cover ...the flat part just below the bit you can't remove. Use a diamond disc cutter on a dremel/rotary tool and then open the slot to a  louvre with a flat screwdriver so it points downwards.

The mods I do follow on from the original design intent in having the exhaust heading downwards out of the machine rather than sideways burning the cover and your leg as in the drill method.

Both mods work but one is "Engineered", the other is just simple and not particularly good.

[arboriculturist]

Sounds perfect to me Steve - I will report back in due course 👌