NEED HELP PLEASE; I have a 4.2 sachs converted to cdi, has shielded harness, spectrum 8 2.4 radio, receiver 13 inches from cdi unit. Current plug is a champion DJ7J. Engine starts and runs great, however when the engine is running I am getting severe glitchs on the ailerons. I have been told that problem may be the plug is not a resistor type plug. I cannot find any info as to what plug should be used in this engine, does anyone know, name and number of plug.

Thanks

Joe

You were told right about the none resistor plug.

You need a NGK BPMR6F spark plug, The R in the plug type stands for resistor plug.

Milton

You can also use the Champion RCJ8 plug,if u cant find the NGK,

And, make sure the plug cap fits securely. Good luck