#4 - Running the Engine on a Test Stand

        The engine mounts supplied with the DL50 engine are designed to be used on an airframe intended for use with a 50cc gas engine. Running your engine on a test stand may very well cause them to fail. A typical test stand does not allow the vibration energy produced by the engine to dissipate as it would if mounted in an airframe. As a result, this energy causes undue stress to be exerted on the mounts and they will likely fail if run long enough. When properly used, the engine mounts will provide trouble free operation. Our own experience has one set of original mounts still performing flawlessly after over 176hrs of vigorous use.

        Improper use of the engine or its parts may result in injury and property damage. Please read and follow all items presented in the operating instructions shown on the MANUAL page. This is important for your safety as well as your enjoyment of the engine.

#3 - Testing Your Ignition Ground / Shielding

        “Grounding” for the DL50 engine / ignition system is conducted through the Spark Plug / Spark Plug Cap (with Split Ring Retainer installed) / Plug Cap Grounding Spring / Plug Wire Shielding / Ignition Module Case. If any part of this circuit has been interrupted (worn, broken, torn, missing, etc.), an incomplete circuit can exist which might cause radio interference.

        The circuit can be tested with a Continuity Tester or Volt Ohm Meter, by attaching a test lead to the metal housing of the ignition module (away from the clear label tape) and the other test lead to the engine. The tester must show a completed circuit for it to be considered OK. If this circuit is incomplete, it should be repaired or replaced; a bypass grounding circuit will not provide the required shielding.

        NOTE: this test is not intended to be used in place of a complete (engine off and running) range check of your radio system. A range check should be performed at the beginning of every flying day, or before any flight if you suspect there may be a problem. Also, a careful visual inspection of the plug wire shielding should be performed at the beginning of every flying day as a worn or frayed shield can allow interference to occur even if the grounding circuit is complete.