Carburetor Components

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Carburetor Components

Pressure Washer Carburetor Parts

A gummed-up carburetor is the number one reason a gas pressure washer refuses to start in spring, and the fix usually costs less than lunch. This collection covers carburetors, repair kits, jets, float needles, insulators, and throttle parts for the Honda GX and GCV engines that power most washers. Not sure which engine you have? Call 301-519-9274 and read us the numbers stamped on the crankcase.

Match the Carburetor to Your Honda Engine

Every part on this page is sorted by engine family, so start there. The GX160 and GX200 are the small-frame engines on 2.5 to 3 GPM machines. The GX240 and GX270 sit on mid-size rigs. The GX340 and GX390 are the 11 and 13 horsepower workhorses that run 4 GPM contractor machines. The GCV160 is the vertical-shaft residential engine found on many homeowner washers. The model designation is cast or stamped right on the engine block, usually near the spark plug or on the crankcase cover. Jets, floats, and insulators all differ between frame sizes, so a GX200 jet will not tune a GX390. Buy by engine model and the part drops straight in.

Clean, Rebuild, or Replace?

Work the cheap end of the ladder first. If the machine sat with fuel in it, drain the bowl, spray the jets with carb cleaner, and try again. If it starts but runs rough, a repair kit with fresh jets, gaskets, and a float needle runs $9 to $15 and takes about 30 minutes with hand tools. Here is the honest math, though: a complete new carburetor for a GX160 costs $39.59. If you have already cleaned the carb once and it still surges, stop burning Saturdays on it. Bolt on a new one, set the old one aside for parts, and go back to work.

Symptom Lookup: What Your Engine Is Telling You

Symptom Likely Cause Part to Try Price
Will not start after storage Varnish plugging the jets Carb repair kit GX160 or GX390 $9.68 to $14.95
Surges or hunts at idle Partially clogged jet running lean Brass jet GX160-200 or jet GX340-390 $1.71 to $20.98
Gas dripping from the bowl or air box Float needle not seating Needle valve GX160-200 or GX240-390 $1.88 to $2.21
Cleaned twice, still runs rough Worn or corroded carb body Carburetor GX160 up to GX390 $39.59 to $79.91
Runs lean, hard hot restarts Cracked insulator block leaking air Carb insulator GX160 or GX240-270 $1.69 to $3.66
Engine will not hold set speed Stretched governor springs or throttle wear Control springs or throttle assembly $5.89 to $7.76
Residential GCV machine dead after winter Gummed OEM-style carb Carburetor for Honda GCV160 $36.18

Replacement carburetor for Honda GX390 pressure washer engine

From the Field

Nearly every carburetor we sell traces back to the same villain: ethanol gas left sitting in the bowl. Pump gas starts breaking down in about 30 days, and the ethanol pulls in moisture that turns to green corrosion inside the bowl. Three habits kill the problem. Shut the fuel valve and let the engine run the carb dry before the machine goes on the trailer. Add stabilizer to every can in the shop. Before any layoff longer than a month, crack the bowl drain screw and empty it. Contractors who do this buy jets once in a while. Contractors who do not buy a carburetor every spring. If you find gas in the crankcase oil, that is a stuck float needle flooding past the carb, so change the oil before you restart the engine or you will be shopping for more than a needle valve.

Throttle control assembly for pressure washer engine carburetor linkage

Related Collections

In the area? Bring the whole machine to our Gaithersburg shop and we will diagnose it at the counter.

Frequently Asked Questions

Why does my pressure washer engine surge up and down?

Surging at idle almost always means a partially clogged pilot jet feeding a lean mixture. The governor keeps chasing the dying engine, so the RPM swings. Clean or replace the jet and the surge usually disappears.

How long can gas sit before it damages the carburetor?

Untreated pump gas starts degrading in about 30 days. Past a few months it leaves varnish that plugs jets and gums the float needle. Stabilizer stretches that window, but draining the bowl before storage beats any additive.

Is it better to clean a carburetor or replace it?

Clean it once. If the problem comes back, replace it. Small-frame Honda-fit carburetors here start under $40, which is less than the second and third cleaning attempts cost you in lost work time.

What comes in a carburetor repair kit?

Our GX-series kits include the jets, float needle, bowl gasket, and the small seals that harden with age. That covers the parts responsible for most no-start and flooding complaints.

How do I know which carburetor fits my engine?

Find the model designation cast into the engine block, such as GX200 or GX390, and match the part to that family. Bore and jet sizes change between frame sizes, so the engine model matters more than the washer brand.

Will ethanol-free gas stop carburetor problems?

It helps a lot. Ethanol-free fuel stores longer and does not draw moisture into the bowl, so jets stay clean. Pair it with a fuel shutoff habit and carburetor work becomes rare.