For Universal

Carburetor Adjusting Tool — 21-Tooth Splined

4.6 (4,719)

The screwdriver that turns splined H and L screws on most Zama-equipped 2-cycle engines, alone or paired with a hexagon head.

$5.99price at last check, Sep 27, 2026

Choose your kit21-tooth splined screwdriver$5.9921-tooth splined + hexagon set$5.99

Fits models

Poulan
Husqvarna (before 2022)
Weed Eater
Craftsman
Echo
Toro
Ryobi
Homelite
Sears

Replaces: 530035560

Look at the head of your carb screw before ordering.

About this kit

Manufacturers put splined heads on carb screws so nobody tweaks them with a flat blade. That is fine until the carb needs adjusting. Our 21-tooth tool fits the splined screws on Poulan, Husqvarna (before 2022), Weed Eater, Craftsman, Echo, Toro, Ryobi and Homelite carbs, and replaces part 530035560.

The shaft is nickel-plated Y15 steel and the handle is squared so you can count quarter turns by feel. It does not fit the 22-tooth heads on Walbro carbs. The set adds a hexagon head for engines that use one.

21-tooth splined head, replaces 530035560
Nickel-plated Y15 steel shaft
Squared handle for counting quarter turns
Not for 22-tooth Walbro screws

In the box

1 adjusting tool (option 1)
splined + hexagon tools (option 2)

For machine brand	Universal
Replaces	530035560
Items in the kit	2
Kit options	2
Rating	4.6 / 5 from 4,719 reviews
Category	Fuel Lines, Primer Bulbs, Filters & Carb Tools