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Magnum Engines XL 70 RFS Blue R/C 4-Stroke EngineProduct Review (submitted on February 24, 2012):
I am wondering if there is a different reason for the glo plug issues such as fuel type etc. Are ou running fuel and then dumping the leftover back into the gallon container or maybe too much nitro or oil? Just thoughts because this happens a lot when guys put the remaining tank fuel back into the main jug. The unused fuel has byproducts from the recirculating due to muffler pressurization of the fuel tanks. Along with the pressure comes the burned fuel back into the plane's fuel tank and over a few flights of putting the tank fuel back into your main jug will cause flight issues because of contamination's. This will also toast your coil in the plug over a very short amount of time.
Just a thought and maybe a solution?
Good luck with it. Other than this I just recommend trying a different fuel mfg or ratio of nitro.