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Honda GX Gasket Kits
Pulling the head or the carb on a GX engine and reusing the old gaskets is how a one hour job turns into two. These gasket kits cover the Honda GX160 through GX390 engines that power most gas pressure washers, with the seals you need in one bag. Order online or call 301-519-9274 with your engine model and we will confirm the right kit.
Matching a Gasket Kit to Your Engine
Every Honda GX engine wears its model number on the side of the crankcase or on the recoil housing sticker. Read it off the engine, not the pressure washer decal, because builders swap engines mid production run. The number tells you displacement, and displacement is all you need to pick the kit.
| Kit | Fits Engine | Horsepower | Typical Machine | Price |
|---|---|---|---|---|
| Gasket Kit GX160 | Honda GX160, 163cc | 5.5 HP | 2.5 GPM homeowner units | $4.99 |
| Gasket Kit GX200 | Honda GX200, 196cc | 6.5 HP | 2.5 to 3 GPM machines | $8.99 |
| Gasket Kit GX240 | Honda GX240, 242cc | 8 HP | 3 GPM commercial units | $10.25 |
| Gasket Kit GX270 | Honda GX270, 270cc | 9 HP | 3.5 GPM contractor rigs | $17.49 |
| Gasket Kit GX340 | Honda GX340, 337cc | 11 HP | 4 GPM machines | $12.05 |
| Gasket Kit GX390 | Honda GX390, 389cc | 13 HP | 4 GPM at 4,000 PSI rigs | $12.20 |
Prices move with our supplier costs. Call to confirm availability before you tear the engine down.
What Comes in the Kit
A GX gasket kit bundles the paper and composite gaskets that get destroyed any time you open the engine: head gasket, valve cover gasket, carburetor insulator and air cleaner gaskets, exhaust gasket, and the crankcase cover gasket. Buying them one at a time costs more than the kit and usually means a second trip when you find the one you forgot. Compare that to the price of the engine and the math is simple. A GX390 replacement runs several hundred dollars. The kit that keeps it sealed costs about twelve.
Reading the Symptoms
Different gaskets fail in different ways, and the symptom tells you where to look. Oil seeping down the side of the block usually means the valve cover or crankcase cover gasket has hardened with age. Hard starting, low power under load, or oil in odd places points at the head gasket losing compression. An engine that surges or hunts at idle after a carb cleaning often has a torn carburetor insulator gasket pulling in unmetered air. A new exhaust rasp under load is typically the muffler gasket. In every case the fix is cheap. The mistake is running the engine for weeks while it leaks, because low oil and lean running kill GX engines that would have lasted another decade.
From the Field
Order the kit before you open the engine, not after. Once the head is off, the machine is stuck on the bench until parts arrive, and a down machine does not bill hours. Two more habits worth stealing from the repair bench: clean aluminum mating surfaces with a razor blade and solvent, never a wire wheel on a drill, because gouged aluminum will not seal no matter how new the gasket is. And check the head bolt torque with a torque wrench instead of guessing. GX390 head bolts spec at 25 ft-lb. Overtightening warps the head and you are back where you started.
Related Engine Parts
- All engine parts and Honda parts
- Head gaskets sold individually
- Carburetor components
- Cylinder head components
- Engine air filters and Honda replacement filters
- Recoil start assemblies
- Camshaft and crankshaft parts
- Pressure washer repair parts
Wrenching locally? Our Gaithersburg counter can look up fitment while you wait.
Frequently Asked Questions
How do I know which gasket kit fits my engine?
Find the GX model number stamped on the engine crankcase or printed on the recoil sticker. GX160 is 5.5 HP, GX200 is 6.5, GX240 is 8, GX270 is 9, GX340 is 11, and GX390 is 13 HP. Match the kit to that number and you are done.
What gaskets are included in a GX gasket kit?
The set covers the gaskets disturbed during a top end or carb job: head gasket, valve cover gasket, carburetor insulator and air cleaner gaskets, exhaust gasket, and crankcase cover gasket.
What are the signs of a blown head gasket on a GX engine?
Hard starting, weak power under load, and compression you can hear escaping while cranking. Pull the head and the failed section of the gasket usually shows a carbon track across it.
Can I reuse gaskets if they look fine?
No. Paper and composite gaskets crush once to fill the surface imperfections. Reused gaskets seep oil or leak vacuum within hours of a rebuild. At these prices there is no reason to gamble.
Why does my engine surge after I cleaned the carburetor?
Most likely a torn insulator gasket between the carb and the block letting extra air in. The engine runs lean and hunts at idle. A new gasket from the kit fixes it in fifteen minutes.
Do these kits fit clone engines?
Often, since many clone engines copy Honda GX dimensions, but we only guarantee fitment on genuine GX blocks. Call with your engine details and we will tell you straight whether it will work.