The part number for the unloader valve will be 788419. We no longer sell parts through Northern Tool. To order, please contact our sister company Jacks Small Engines at the link provided. https://jackssmallengines.com/
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- To qualify for this offer, your order subtotal must equal $100 or more. Excludes gift cards, free item offers, warranties, Advantage memberships, tax and shipping.
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- Free e-gift cards expire 10/01/26.
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- Limited-time offer. Subject to change without notice.
NorthStar Gas Cold Water Pressure Washer, Honda GX390 OHV Engine, 4000 PSI, 3.5 GPM

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Shipping:
Free shipping (lower 48 states) - Available nowHeavy/large item. Lift gate service available.
Store Pickup:
Not available - online only
- Honda GX390 OHV engine for quiet, reliable performance
- CAT 5CP belt drive triplex plunger pump with thermal protection and ceramic plungers
- Oil drain cutouts for quick, clean engine and pump oil changes
- Easy Start prevents pressure buildup for smoother, easier recoil pulling
- Adjustable pressure allows easy control of the PSI to suit any job
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Description
Key Specs
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Q & A
Accessories
Warranty
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Product Summary
NorthStar pressure washers undergo thousands of hours of rigorous testing to ensure peak performance, plus include an industry-leading warranty to give you extra peace of mind.
What's Included
- (1) NorthStar Gas Cold Water Pressure Washer with Honda GX390 OHV Engine (1) 3/8in. x 50ft. Uberflex nonmarking hose (1) Rear entry spray gun and lance with 18.5in. quick-connect wand (4) Professional-grade quick-connect nozzles (15°, 25°, 40° and chemical)
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Features + Benefits
- Honda GX390 OHV engine for quiet, reliable performance
- CAT 5CP belt drive triplex plunger pump with thermal protection and ceramic plungers
- Oil drain cutouts for quick, clean engine and pump oil changes
- Easy Start prevents pressure buildup for smoother, easier recoil pulling
- Adjustable pressure allows easy control of the PSI to suit any job
- Rugged 1-3/8in. steel tube frame and 15in. flat-free tires for easy, durable portability
- Includes 3/8in. x 50ft. Uberflex® nonmarking hose, rear entry spray gun and lance with 18.5in. quick-connect wand and four professional-grade quick-connect nozzles (15°, 25°, 40° and chemical)
- 3-year limited warranty on Honda engine; 5-year limited warranty on pump; 10-year limited warranty on frame
Key Specs
| Attribute | Specification |
|---|---|
item# | 157136 |
Brand | NorthStar |
Manufacturer's Warranty | 4 year limited warranty |
Ship Weight | 253.0 LB |
Pressure | 4,000 PSI |
Flow | 3.5 GPM |
Engine Brand | Honda |
Engine Model | GX390 |
Engine Displacement | 389 cc |
Fuel Type | Gasoline |
Pump | CAT 5cp |
Drive Style | Belt |
Number of Tips Included | 4 |
Adjustable Pressure | Yes |
Gross Torque | 19 ft-lbs. |
Start Type | Recoil |
| Attribute | Specification |
|---|---|
Engine Oil Included | No |
Engine Oil Type | SAE 30 |
Fuel Capacity | 1.6 Gal |
Max. Inlet Water Temp | 140 °F |
Orifice Size | 3.5 |
Chemical Injector | Yes |
Hose Length | 50 ft |
Coupler Size | 3/8 in |
Nozzle Type | Quick-connect |
Quick Connect Nozzle | Yes |
Pump Oil Included | Yes |
Low Oil Shutdown | Yes |
Thermal Protector | Yes |
Product Weight | 210.0000 lb |
Dimensions L x W x H (in.) | 50.5 x 28.5 x 26.25 in |
Reviews
Questions & Answers
Questions
-
· 2 years ago
What unloader valve should I replace mine with to match or upgrade th OEM one?
1 answer-
NorthstarExpert11· 2 years ago
Helpful?
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Anonymous· 3 years ago
How many gallons is the tank
1 answer-
productexpert6· 2 years ago
It would have a 6.1 liter gas tank.
Helpful?
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· 5 years ago
CAN THIS MODEL 157136 HONDA 13HP COME WITH ELECTRIC START AND BATERY/ BOX
1 answer-
NorthstarExpert29· 5 years ago
This model does not have an electric start option.
Helpful?
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· 5 years ago
What pressure is the hose rated for to order longer hose what would the part # be
1 answer-
NorthstarExpert13· 5 years ago
The hose is rated for 4000 PSI. You can double the length of the hose using item 42945.
Helpful?
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Accessories We Recommend
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Warranty
Manufacturer's Warranty
4 year limited warranty
Extend Your Warranty Coverage with a Northern Protection Plan (NPP)
Repair Plan — 1 Year
A Northern Protection Plan is available after adding the product to your shopping cart.
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Specifications
4,000 PSI
3,100 PSI
2,000 PSI
5,000 PSI
3.5 GPM
2.5 GPM
3.5 GPM
5 GPM
Honda
Northstar
Honda
Honda
GX390
C180
GX200
GX690
389 cc
179 cc
196 cc
688 cc
Gasoline
Gasoline
Gasoline
Gasoline
CAT 5cp
Comet DWD
CAT 2sf35gs
Comet Crankshaft Triplex
Belt
Direct
Direct
Belt
4
4
4
4
Yes
Yes
Yes
Yes
19 ft-lbs.
-
9.1 ft-lbs.
35.6 ft-lbs.
Recoil
Recoil
Recoil
Recoil
No
No
No
No
SAE 30
SAE10W-30
SAE 30
SAE 30
1.6 Gal
0.87 Gal
0.83 Gal
11 Gal
140 °F
140 °F
140 °F
140 °F
3.5
3
5
4.5
Yes
Yes
No
Yes
50 ft
50 ft
100 ft
50 ft
3/8 in
3/8 in
1/4 in
3/8 in
Quick-connect
Quick-connect
Quick-connect
Quick-connect
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
210.0000 lb
lb
550.0000 lb
365.0000 lb
50.5 x 28.5 x 26.25 in
40.25 x 26.0 x 23.75 in
75.0 x 43.0 x 42.0 in
33.75 x 32.25 x in
-
10 in
-
-
-
-
140 °F
-
-
-
30w Nondetergent
Universal Tractor Transmission
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NorthStar Gas Cold Water Pressure Washer, Honda GX390 OHV Engine, 4000 PSI, 3.5 GPM
Item # 157136









