I have a Homelite 25cc conversion in a 100" WS H9 J3 Cub. This is my FIRST gas engine of any type, so I realize this is probably another dumb question. Please be gentle! [sm=red_smile.gif]

This engine and plane ran and flew very well, but didn't have a kill switch that I could activate with my transmitter. The president of the club where I fly strongly suggested that I install a kill switch that I can activate with the Tx.

OK, no problem, I think I can do that. I bought a 250V 6A micro switch from Radio Shack, and wired it into the existing kill switch on the side of the fuse. I confirmed that all that original kill switch did was connect to ground to kill the engine, so I wired my micro switch in parallel. I made up a little piece of lite ply to hold the HS-81 servo close to the micro switch, and mounted it as far away from my Rx as I could. (Picture below) Now, when I flip my gear switch on my Tx, the servo trips the micro switch and kills the motor. And, my little homemade remote kill system does work just fine to kill the motor!

However, ....here's the problem. During testing, my engine started to blip and lose RPM's momentarily. It would nearly die sometimes. I checked my newly installed remote kill system, and sure enough, the servo is twitching and gyrating like all get out. During the servo twitching, it nearly shuts the engine off sometimes, and the sequence coincides with the engine blips. Obviously, it is NOT going up like this!

So, I assume it is interference from the magneto that is affecting my servo. (Right or wrong?)

How can I stop the interference? I thought that I should keep the remote kill system as far away from the Rx as I could, so I mounted it as far forward as possible. What do you recommend?

Thanks in advance! ...Ken