The idle speed is preset and should not be adjusted. Modifications to the engine would void the warranty.
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NorthStar e420 EFI OHV Horizontal Engine, 420cc, 1in. x 3-31/64in. Shaft

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- Model# E420; 420 EFI engine with 1in. x 3-31/64 horizontal shaft
- OHV overhead valve design
- CDI ignition system with recoil start featuring compression release for first pull starts
- Bolt circle: 5in. and 6.5in.; mounting base: 7-11/16in. x 3-3/16in.; 3-11/16in. (approx.)
- Cast iron cylinder sleeve reduces bore wear to extend engine life and reduces emissions and oil consumption
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Description
Key Specs
Reviews
Q & A
Accessories
Warranty
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Product Summary
Replacement compatibility may vary based on engine shaft, mounting plate, dimensions, and other specifications. Always verify specifications prior to purchase. Please see product manual for additional information.
What's Included
- (1) Horizontal engine (1) Spark plug wrench
Downloads

Features + Benefits

- Model# E420; 420 EFI engine with 1in. x 3-31/64 horizontal shaft
- OHV overhead valve design
- CDI ignition system with recoil start featuring compression release for first pull starts
- Bolt circle: 5in. and 6.5in.; mounting base: 7-11/16in. x 3-3/16in.; 3-11/16in. (approx.)
- Cast iron cylinder sleeve reduces bore wear to extend engine life and reduces emissions and oil consumption
- Easy-to-install model for small engine needs
- 1,000-hr. engine delivers enough power to run a wide range of equipment, including log splitters and pressure washers
- EFI Electronic Fuel Injection allows for fuel efficiency, easy starting in all weather conditions and eliminates common carburetor complications
- Heavy-duty 6.2L metal fuel tank
- USDA Forestry-approved Spark Arrestor for added safety
- Illuminated NorthStar Logo showcases quick, at-a-glance engine running condition
- Forged-steel crankshaft offers superior strength in high-torque PTO applications
- Dual ball bearings reduce friction and wear, delivering smooth operation and longer life
- Internal oil splash enhancement system delivers extra lubrication
- Sound pressure balanced muffler for quieter operation
- Black aluminum alloy cylinder head cover
- All-metal camshaft
- Upgraded deep groove ball bearing
- Low oil shutdown turns the engine off if it runs low on oil, preventing serious damage or failure
- Pleated paper air filter and foam pre-cleaner for superior protection from harmful debris
Key Specs
| Attribute | Specification |
|---|---|
item# | 114594 |
Brand | NorthStar |
Manufacturer's Warranty | 5 year limited warranty |
Ship Weight | 90.0 LB |
Engine Displacement | 420 cc |
Engine Type | 4-stroke, Overhead, Single Cylinder |
Shaft Diameter | 1 in |
Shaft Diameter Metric | 25.4 mm |
Shaft Length | 3.48 in |
Shaft Length Metric | 88.39 mm |
Start Type | Recoil |
Shaft Keyway | 6.3mmW x 56mmL (2 13/64in.) in |
Crankshaft | Forged Steel |
Cylinders (qty.) | 1 |
Net Power Output | 8.8 HP |
Fuel Tank | Yes |
| Attribute | Specification |
|---|---|
Fuel Tank Capacity | 6.55 qt |
Oil Capacity | 1.16 qt |
Low Oil Shutdown | Yes |
Low Oil Alert | Yes |
Shaft Rotation (From PTO Shaft Side) | Counter Clockwise |
Governor System | Yes |
Ignition System | CDI |
Carburetor | EFI |
Lubrication System | Splash |
Bearing Type | Ball |
Cooling System | Air |
Bore | 3.54 in |
Stroke | 2.6 in |
Air Cleaner Type | Dual Element |
Charging System Amps | 5 |
Muffler Included | Yes |
Reviews
Questions & Answers
Questions
-
· 9 months ago
Can the idle speed be adjusted
1 answer-
NorthstarExpert12· 9 months ago
Helpful?
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· 10 months ago
Can I add an electric starter to this model even though it does not come with one?
1 answer-
NorthstarExpert12· 10 months ago
This engine is not designed to have an electric starter added. Modifications to the engine would void the warranty.
Helpful?
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· a year ago
Is there a remote start and throttle option?
1 answer-
NorthstarExpert12· a year ago
A throttle cable can be installed; however, we do not recommend modifying this engine with a remote starter.
Helpful?
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· a year ago
What are the dimensions of this motor width length and hight
1 answer-
NorthstarExpert12· a year ago
The overall dimensions of this engine are 20.28" long x 14.57" wide x 18.31" high.
Helpful?
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· a year ago
Does this machine come from factory with a governor in it?
1 answer-
NorthstarExpert12· a year ago
This engine is not equipped with a governor. The RPM of this engine is electronically controlled by the engine control unit (ECU).
Helpful?
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· a year ago
Does this engine have a charging coil
1 answer-
NorthstarExpert12· a year ago
This engine is equipped with a charging coil.
Helpful?
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· a year ago
Does this engine have pressurized lubrication system or is it splashed lubrication??
1 answer-
NorthstarExpert12· a year ago
This engine is equipped with a splash type lubrication system.
Helpful?
-
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Warranty
Manufacturer's Warranty
5 year limited warranty
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Specifications
420 cc
179 cc
429 cc
999 cc
4-stroke, Overhead, Single Cylinder
OHV
Command Pro
Horizontal
1 in
3/4 in
1 in
1-1/8 in
25.4 mm
19.05 mm
25.4 mm
25.4 mm
3.48 in
2.43 in
3.49 in
4 in
88.39 mm
61.7 mm
88.846 mm
-
Recoil
Recoil
Electric and Recoil
Electric
6.3mmW x 56mmL (2 13/64in.) in
1-51/64 in
3/8 in
.375 keyway drilled and tapped 1.5in. deep 5/8-18UNF in
Forged Steel
SAE J609EXT3 Straight Key W/shaft Dia.: 19.050mm (0.750in.) - Nominal
Hardened
1.125in. x 4in.
1
1
1
2
8.8 HP
3.7 HP
14 HP
39 HP
Yes
Yes
Yes
-
6.55 qt
3.49 qt
7.4 qt
-
1.16 qt
0.58 qt
1.4 qt
2.1 qt
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Counter Clockwise
Counter Clockwise
Counter Clockwise
Counter Clockwise
Yes
Yes
-
Variable Speed
CDI
Transitorical Configuration
Electronic
Electronic
EFI
Carburated
Yes
Two Barrel
Splash
Splash
Splash
Full Pressure
Ball
Ball
Ball
Parent Material
Air
Air
Air
Air
3.54 in
2.55 in
3.5 in
-
2.6 in
2.125 in
2.7 in
-
Dual Element
Foam+paper
Dual Element
Single Element
5
No
10
25
Yes
Yes
Yes
Yes
-
9.5 ft-lbs.
22.7 ft-lbs.
55.3 ft-lbs.
-
4.17 in
5.526 in
-
-
2.56
Cast Iron
Cast Iron
-
8.5:1
8.0:1
8.8:1
-
Yes
-
-
-
Manual
Manual
Automatic
-
Adjustable
No
Remote
-
3.625 in
-
-
-
6.378 in
-
-
-
3.15 in
-
-
-
-
Gasoline
Gasoline
-
-
3,750
3,000
-
-
87
-
-
-
Yes
-
-
-
Yes
Yes





