Horizon Hobby Evolution 152GX, User Manual, Page: 11 / 16

11
Troubleshooting Guide
If the engine does not start:
- Check and use a new spark plug if needed.
(Check the spark: put the plug into the cable end and by turning
the engine you´ll see the necessary spark. note: The plug must
touch a metal part of the engine.)
- Check fuel lines.
- Check for proper mechanical function by turning the
engine over.
- Check that the carburetor is correctly installed.
- Remove the carburetor cover from the feed side; check
the filter and blow off carburetor with compressed air
( Caution: When using compressed air, use eye protection. );
when re-assembling be careful to maintain the proper order of
the components.
- Check the vacuum feed line.
Mechanical Faults
If the engine cannot be turned over easily:
- The piston in the cylinder may be seized: loosen and unscrew
the cylinder bolts.
- Carefully remove the cylinder.
- Visually examine the piston and crankcase to find the likely cause
of the engine’s mechanical problem.
noTE:
Mechanical repairs must always be completed by our
professional service department.
Replacing the reed valve:
– Loosen carb screws and remove the carburetor (be careful to not
damage the gasket).
– Loosen four M4 screws on the flange, remove the flange and take
off the reed valve (be careful to not damage the gasket).
– Loosen four M2 screws and remove the old valves, replace them
with new ones, replace all screws and tighten gently.
– Be sure the gaskets are in their proper places.