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Engine Troubleshooting

After building a Balsa USA Fokker D7 1/4-scale biplane and doing the final setting up on the engine prior to taking to the field, I discovered a violent vibration problem with not one but TWO brand new engines! Good Results on the Test Stand I first ran my original engine choice for the D7, a DLE-35RA, on my test stand for just a bit of break-in and to set the needle valves. The engine ran...
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