alan_k Posted March 3, 2011 Share Posted March 3, 2011 Found this on another forum. Can't quite understand how this could happen but thought it worth sharing just in case it is affecting anyone. 'Ken Johnston, Green Country PPG, shares that the new Tiny Tach Commercial model may be causing problems with paramotor kill switches. It has been confirmed on 3 separate paramotors using the Black Devil 172. If too many wraps are made around the spark plug wire (using the red antenna wire), the kill switch will cease to function. The solution is to use the minimum wraps necessary to get a good rpm reading, often 2 will work. Then test the kill switch at several different rpm levels to insure its proper function. It's possible that other engines could be affected so check your kill switch after installing this tachometer. Check it at various RPM levels.' Cheers, Alan Quote Link to comment Share on other sites More sharing options...
steelmesh Posted March 13, 2020 Share Posted March 13, 2020 This is an unintuitive characteristic. Is it because the Tachometer signal wire is in parallel with the kill-switch wire, as in the Tiny Tach is mounted at the hand-throttle? Quote Link to comment Share on other sites More sharing options...
alan_k Posted March 13, 2020 Author Share Posted March 13, 2020 I don't believe it to be a problem. Always test your kill switch before you take off> Quote Link to comment Share on other sites More sharing options...
Adam Ferguson Posted March 14, 2020 Share Posted March 14, 2020 Not quite sure how this would have any effect on the kill switch. The kill switch just grounds the low tension side of the coil. The RF generated by the pulse going up the tacho pic up wire running alongside the kill wire will do nothing. In fact the coil side of the kill switch already has a pulse on it, which I have verified with a scope and I use this pulse to calculate the rpm on my Paramotor Engine Monitor I'm working on. Is the Tiny Tach powered from the motor rather than an internal battery? If so there could be an issue there. Quote Link to comment Share on other sites More sharing options...
alan_k Posted March 14, 2020 Author Share Posted March 14, 2020 Tiny Tach's are all internal battery. They last for years and years. Quote Link to comment Share on other sites More sharing options...
Adam Ferguson Posted March 14, 2020 Share Posted March 14, 2020 This is is the wiring diagram for the Black Devil 172. Its nothing special so you would think this would be a problem on all motors. Quote Link to comment Share on other sites More sharing options...
Adam Ferguson Posted March 14, 2020 Share Posted March 14, 2020 14 hours ago, alan_k said: I don't believe it to be a problem. Always test your kill switch before you take off> I usually end up testing mine just after I attempt to take off. 1 Quote Link to comment Share on other sites More sharing options...
Ralf Posted January 11, 2021 Share Posted January 11, 2021 Dear Paramotor Friends, I am Ralf from Germany and had even worse Issues with my previous Walkerjet F200 in combination with TinyTach. I made 4 wraps around the Sparkplug wire and this it killed me (via inductivity) three Ignition Coils until I found out this was the reason! So be careful with rpm pickup wires, I dont use it on my Nitro 200 anymore. Greetings & always happy landings Quote Link to comment Share on other sites More sharing options...
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