Today i've tested a DL 50 engine with a Champion Y82 spark plug. User has changed all the way the needles setting. The problem is that this spark plug does not run well on this engine. But Campion brand is well know and makes very good spark plugs. All i can say is that DL stock spark plug can perform the same at NGK CM6 if gap is checked an set the same. Also there are some spark plugs like NGK CM6 that performs the same (i.e. RCEXL ones).
I play with RC engines more than 30 years.
I hope the Mods don't take offense if I post a link to another forum here but Ralph Cunningham (Rcign) has been doing a bit of mythbusting
Look what he has to say about spark plug gaps on the DLE30 !
http://www.modelaviation.com.au/foru...php?f=11&t=107
By the way, his verdict on the engines has been all positive - very positive, actually [sm=thumbup.gif]