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OVERHEAD CAM
1 Chain-driven overhead cam
2 Optimized-capacity rigid muffler
3 Dual ball bearing crankshaft support
4 Pent roof combustion chamber
5 Case-hardened steel timing chain
6 Lubrication holes for the critical
rod journal
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5
4
1
6
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Combining advanced technology
with experienced craftsmanship, Subaru Robin’s
EX Series engines are leading the industry.
With four models ranging from 4.5- to 9-horsepower, these engines are superior to competitors in the same class. After all,
it’s the first air-cooled engine line to use advanced chain-driven overhead cam (OHC) technology to ensure more power, less
noise and easy, one-pull starting every time.
KEY FEATURES
BENEFITS
Subaru Robin’s EX Series engines take technology to the extreme. Using chain-driven
overhead cam (OHC) technology, these workhorses provide maximum efficiency,
performance and power, along with minimal noise and emissions.
Extremely easy starting with no kick-back:
• An automatic decompression system offers easier starting, reducing the required pulling force
by 30 to 40 percent.
• EX engines start instantly even at temperatures as cold as -10 C without any
perceptible kick-back.
These engines take a lot of abuse, which is why they were built with
longevity in mind. A cooler running design and heavy-duty interior parts
ensure maximum uptime. When maintenance is performed, EX Series
engines require no special tools and have high parts commonality
between models.
More power means superior performance:
• Pent roof combustion chamber allows for a high compression ratio of up to 9:1.
Less noise:
• 33 percent fewer moving valve train parts than OHV designs and reduced mechanical
noise ensures noise levels a full 2 dbA below competitive models.
• The patent-pending cooling design features a slanted cylinder
and 360-degree airflow around both the exhaust and intake
valve stem areas.
• Heavy-duty piston rings and a cast-iron cylinder liner resist
wear and ensure a long engine life.
• A case-hardened steel timing chain allows for precision timing
and maximum durability.
ADVANCED TECHNOLOGY
LONG LIFE AND EASY MAINTENANCE
*for 6 hp and above
Offers exceptional
noise reduction.
Extra-large, Extremely Quiet Muffler
•
Charging System up to 200 watts*
•
Electronic Low Oil Shut-Off System
•
Key, Tapered or Threaded Shafts
•
Manual or Cable Remote Throttle Control
Accommodates a
compact design for
generator applications.
Low-profile Air Cleaner
For quick, convenient
and easy starting.
Electric Start*
Ensures engine
protection even in high
dust environments.
Cyclone Pre-cleaner
FACTORY OPTIONS
•
Solenoid-Actuated Idle Control
•
Manual or Remote Control Choke
•
Multiple Air Cleaner Options
EX13
EX17
EX21
EX27
Competitor
Competitor
Competitor
Competitor
0 1 2 3 4 5 6 7 8 (kW)
Max Power
#4 - Pent roof combustion
chamber enables optimum intake
and exhaust valve placement for
maximum engine performance
and efficiency.
#3 - Dual ball bearing crankshaft
support offers maximum stability
under demanding loads.
#1 - Industry leading chain-driven
overhead cam offers superior
power and performance.
#2 - Optimized-capacity
rigid muffler for noise
reduction 2 decibels below
competitor models.