Read the manual thoroughly and understand all of the instructions, cautions, and warnings before using this equipment. If any section of the manual is not understood, contact your nearest authorized dealer, or contact Generac Customer Service at 1-888-436-3722 (1-888-GENERAC), or www.generac.com with any questions or concerns. 

Pressure Washer Engine Components

Note: Bill of materials with an exploded view of all parts can be found using the Product Lookup tool on Generac.com. See How can I find a bill of materials (BOM) for my pressure washer? for more information.

Engine Type

• All Generac engines are 4 stroke. Do NOT require fuel/oil mixture.
• All of our pressure washers feature a Generac engine except the commercial grade 4000PSI model (G008872).
• Engines are generally sized in accordance with the pressure rating (PSI) of the unit.
• For customers who want to know what type or size of engine their pressure washer has, refer to the product's spec sheet: How Do I Find the Spec Sheet and User Manual for My Pressure Washer on Generac.com?
• The range of pressure washer engine sizes is 196cc-420cc

On/Off Switch 

• Kill Switch, Power Switch, Rocker Switch 
• 0 = OFF / I = ON
• Must be in the ON position to start/run

Engine Oil 

• Verify proper viscosity for temperature range
• Check oil at each use – low oil shutdown
• Unit must be level when checking/filling

No Oil Filter – Pressure Washer Engines

• OHV engines do NOT feature an oil filter

Spark Plug

• Ignites the fuel/air mixture
• Make sure the spark plug boot is tight
• Check for damage and gap per the manual’s specs

Valve Adjustment/Valve Lash 

• Adjust intake and exhaust valves at scheduled intervals
• Intake is closest to the carburetor
• Exhaust is closest to the muffler

Fuel 

• 30-90 day shelf life – use stabilizer
• Use fresh fuel only
• Minimum 87 octane with <10% ethanol only

Fuel Shut Off Valve 

• Stops the flow of fuel to the carburetor
• ON for starting and running
• OFF for moving and storage

Carburetor 

• Regulates fuel-air ratio
• Carb cleaner – removes gum/dirt
• Run dry before storing

Choke Lever 

• Restricts the flow of air into the engine
• CLOSE for starting
• OPEN once running

Air Filter 

• Poor air can impact engine performance.
• Clean or replace regularly. 

Battery

• Used with electric start units
• Charge per manual recommendations