Uploaded February 2026 | Updated September 2026, 1 week ago
If you’ve tried to adjust your chainsaw carburetor and realized the screws aren’t flat-head or Phillips, you’re not alone.
One of the most common questions I get is: “You adjust carbs easily in your videos — but mine has odd screws I can’t turn.”
This video explains why manufacturers use special carb adjuster screws, and the correct, affordable way to deal with them.
Many modern chainsaws use special-shaped carb adjuster screws (D, double-D, spline, Pac-Man, single-slot, etc.) to prevent tampering.
A normal screwdriver simply won’t work — and forcing it can damage the screw.
In this video I show a multi-pack carb adjuster tool set I bought for around £7–£8.
It includes multiple shapes and sizes, and one will almost certainly fit your carb.
For far less than the price of one adjustment at a service centre, you get:
The correct tool
The ability to adjust your carb properly
Tools that work on many different chainsaws and small engines in the future
That’s long-term value.
If you don’t want to keep a full set
I also explain an option I genuinely wish someone had done for me years ago:
If you only need one specific adjuster, you can:
Keep the tool you need
Pass on or sell the others to someone else
Help another person stuck with the same problem
It saves money, reduces waste, and helps someone else out — win-win.
This video is for those
Chainsaw carb screws you can’t turn
“Odd” or tamper-proof carb adjusters
Carb tuning without paying a service centre
DIY chainsaw repair
Stihl / Husqvarna / Echo / generic carbs
This is practical, real-world advice based on what people actually struggle with — not theory.
If this helped you, consider subscribing for honest, proper small-engine repair advice that saves you money and frustration.
Have a great day
Craig
If you’ve tried to adjust your chainsaw carburetor and realized the screws aren’t flat-head or Phillips, you’re not alone.
One of the most common questions I get is: “You adjust carbs easily in your videos — but mine has odd screws I can’t turn.”
This video explains why manufacturers use special carb adjuster screws, and the correct, affordable way to deal with them.
Many modern chainsaws use special-shaped carb adjuster screws (D, double-D, spline, Pac-Man, single-slot, etc.) to prevent tampering.
A normal screwdriver simply won’t work — and forcing it can damage the screw.
In this video I show a multi-pack carb adjuster tool set I bought for around £7–£8.
It includes multiple shapes and sizes, and one will almost certainly fit your carb.
For far less than the price of one adjustment at a service centre, you get:
The correct tool
The ability to adjust your carb properly
Tools that work on many different chainsaws and small engines in the future
That’s long-term value.
If you don’t want to keep a full set
I also explain an option I genuinely wish someone had done for me years ago:
If you only need one specific adjuster, you can:
Keep the tool you need
Pass on or sell the others to someone else
Help another person stuck with the same problem
It saves money, reduces waste, and helps someone else out — win-win.
This video is for those
Chainsaw carb screws you can’t turn
“Odd” or tamper-proof carb adjusters
Carb tuning without paying a service centre
DIY chainsaw repair
Stihl / Husqvarna / Echo / generic carbs
This is practical, real-world advice based on what people actually struggle with — not theory.
If this helped you, consider subscribing for honest, proper small-engine repair advice that saves you money and frustration.
Have a great day
Craig
