RE: YS 170 DZ CDI
Hello Brett,
You can run the CDI on an F glow plug, it's the same as the YS4 and it is the correct plug. You can run 15% or lower oil content with no problems, but the engine will last longer on 20%, so 15 for a few flights or even competition should be fine.
You should not use a glow driver with no delay, if the engine backfires you could bend a valve, if you don't have adelayed glow driver, try to pu a switch if it has cable or have some to conct it after the prop is spinning.
Best regards
Alejandro P.