Product Manual
Maintenance & Repair (cont’d) 
48 
4.  Reinstall the spark arrester, muffler screen and sparker arrester bracket. 
5. Secure the spark arrester bracket with securing bolts. 
6. Install the end cover and tighten the screws. 
Keep generator 
clean 
Keep generator clean. 
If dust or debris accumulates on the generator, clean the generator with a 
damp cloth or soft bristle brush. Do not allow air intakes to become blocked. 
Note: Do not spray generator with a garden hose or pressure washer. 
Water may enter the generator and cause damage to the rotor, stator, or 
internal windings. 
High Altitude 
Operation 
CAUTION: Operating at an altitude of greater than 5000 feet (1500 meters) 
may affect your engines performance, fuel consumption, and emissions. To 
remain emissions compliant and improve engine performance at higher 
altitudes, a high-altitude kit is required. A high altitude kit includes a 
carburetor jet resized to help correct air / fuel mixture at altitude. To order a 
high altitude kit or if you have additional questions, go to 
www.northerntool.com or contact us at 1-866-443-2576 – Powerhorse. 
Please note, engines with the high-altitude kit installed operated at lower 
altitudes could cause severe engine damage and affect emissions compliance. 
When modified, a tag or decal should be added to the product stating that a 
high-altitude kit was installed and to remind you to re-service the carburetor 
(re-jet) when operating in lower altitude environments. 
Maintenance Schedule 
(1) Initial replacement of engine oil is after one month or 20 hours of operation. 
(2) The air filter should be cleaned more frequently when used in an unusually wet or dusty area. 
* These maintenance steps require tools and technical skills typically performed by a service technician. 
Item 
Steps 
Pre-operation 
check (daily) 
6 months or 100 hrs 
12 months or 300 hrs 
Spark plug 
Check condition. 
Clean and replace if necessary. 
○ 
Fuel 
Check level and for fuel leakage. 
○ 
Fuel hose 
Check for cracks and damage. 
Replace if necessary. 
○ 
Oil 
Check oil level. 
○ 
Replace oil. 
○ (1) 
Air filter 
Check condition. 
Clean. 
○ (2) 
Muffler screen 
Check condition. 
Clean and replace if necessary. 
○ 
Spark arrester 
Check condition. 
Clean and replace if necessary. 
○ 
Fuel filter 
Clean and replace if necessary. 
○ 
Crankcase breather hose 
Check hose for cracks or damage. 
Replace if necessary. 
○ 
Cylinder head 
Remove carbon build up. 
* 
Valve clearance 
Check and adjust when engine is 
cold. 
* 
Fittings/Fasteners 
Check and replace if necessary. 
* 










