Carburettor Gasket & Diaphragm Kit for Walbro WA/WT Carburettors
A low-cost gasket and diaphragm set for Walbro WA/WT-type carburettors (replaces D10-WTA, K10-WAT) — for rebuilding a leaking or poorly running carb.
In short:This Unillea kit contains four gaskets and diaphragms for Walbro WA and WT-type diaphragm carburettors, listed as replacing the D10-WTA and K10-WAT kits and for machines including Stihl FS 40, FS 44, FS 85, FS 86, FS 88, FS 106 and FS 180. Hardened or torn carburettor diaphragms cause flooding, fuel leaks, hard starting and surging. It only fits WA/WT carburettors, so check the model stamped on yours first.
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Pros
- Very cheap way to fix a leaking or poorly running carburettor
- Listed by Walbro kit numbers, so easy to cross-check
- Petrol-, oil- and heat-resistant materials (listing)
Cons
- Only fits WA/WT carburettors — not universal
- Pattern parts: durability may differ from a genuine Walbro kit
- Rebuilding a carb is fiddly the first time
What it is
A pattern repair set for Walbro WA and WT-type diaphragm carburettors — the kind fitted to many brush cutters, chainsaws and blowers. The listing says it replaces the D10-WTA and K10-WAT kits and names machines including the Stihl FS 40, FS 44, FS 85, FS 86, FS 88, FS 106 and FS 180. The kit holds four gaskets and diaphragms, roughly 4 × 4 cm. When we checked in October 2026 the Amazon.co.uk listing showed as unavailable.
When you need it
Brush cutters use diaphragm carburettors (no float bowl), and those thin diaphragms harden with age and ethanol fuel. Typical symptoms: the engine floods or leaks fuel at the carb, starts and then dies, surges at full throttle, or won’t idle. Fresh fuel and a new fuel filter come first; if the problem persists, a rebuild usually cures it. Our guides on cleaning a carburettor and a brush cutter that starts then dies walk through the diagnosis.
Fitting tips
Check the model stamped on your carburettor body before ordering — “universal” carb kits only fit the carburettor family they’re cut for. Lay out the old parts in order as you remove them, compare each new part against the old one, and fit the metering diaphragm the same way up. After a rebuild, the idle may need a small adjustment — see carburettor screws explained.
Honest limitations
A diaphragm kit won’t fix a cracked fuel line, a blocked tank vent or an air leak at the intake. If you’re not comfortable stripping a carb, a dealer service is the safer route — or a replacement carburettor can be quicker on an older machine.
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