Evolution BENZIN-FLUGMOTOR 15GX2 EVOE15GX2 Datenbogen

4

Introduction

Congratulations on your purchase one of the exciting new engines in the Evolution

®

 small 

block gas engine series. All of the Evolution brand gas engines are designed from the start to 
provide you with excellent performance at a fraction of your previous operating costs. We have 
painstakingly designed and tested each engine to ensure a hassle-free experience without 
giving away anything in expected performance or durability. This manual, when read and 
followed, will guide you through the simple steps to your success. Welcome to the Evolution 
family.

Starting with our already proven glow engines enjoyed by thousands around the world, we 
endeavored to take that excitement and experience into the realm of gasoline fuel to provide 
you with a complete package; great performance and low cost of operation.
Step 1  Start with a great engine. The Evolution glow engines have provided thousands of users 

excellent performance. 

Step 2  Design a new carburetor system that will be reliable and provide for hassle-free use by 

the owners. This new carburetor, with already proven technology, was modified to fit in 
the available space in front of the cylinder and the unique needs of a gasoline fueled 
engine. Built onto the front of the carburetor is a fuel-pressure regulator. On the back of 
the carburetor is a new crankcase-driven pump. This pump helps maintain constant fuel 
pressure as well as draw fuel to the carburetor. A new cat’s eye style fuel metering system 
was added to allow for more controllability to the low and mid-range throttle positions.

Step 3  Design the proper muffler system to handle the extra heat and expansion of the burnt gas 

mixture when compared to a glow system. These changes included adding volume to the 
muffler, including a much larger muffler through bolt to handle the heat and stress, and 
enlarging the outlet of the muffler to minimize backpressure while still providing noise 
reduction.

Step 4  Design operating accessories that enhance the user experience. During our extensive  

2 1/2-year testing program we discovered a lot of new techniques and obstacles that are 
unique to gasoline fueled small block engines. 

•  Because the amount of fuel consumed is one third that of a comparable sized 

glow engine, the construction and reliability of the fuel delivery system to the 
carburetor becomes three times as critical. Microscopic pieces of dirt that 
used to safely pass through the larger fuel passages of a glow carburetor will 
wreak havoc on a gasoline system.  

  
The same holds true for air bubbles from the tank or any small leak in the fuel 
tubing; what would pass harmlessly through a glow carburetor simply is not 
tolerated in a gasoline system because the air bubbles are effectively three 
times the size they used to be. We have sourced an excellent sintered plastic 
clunk that, when used in the tank, stops all air bubbles in the fuel line as 
well as filters out any dirt in the fuel system. The included clunk is critical to 
ensuring successful and reliable operation.

•  We found that high temperatures destroy normal Tygon

®

 tubing (the go-to 

choice for gasoline engines) within minutes. We found that Neoprene tubing 
would withstand the temperatures but it tended to degrade quickly in use. We 
recommend using FKM or Viton

®

 tubing in your fuel system plumbing. FKM 

tubing is specifically formulated to withstand high temperatures and harsh 
petrol-based chemicals, such as gasoline.