ORIGINAL: gadix
MJD
SORRY IF I HAVE MISS LEAD ANYONE
you are maybe correct and i'm wrong
hence, i prefer to break in my engines with the factory recomended prop and then fly the model of the best suitable prop within range of size, pitch and rpm's
i think it is logic to do so.
gadi
Sorry for the delay folks........
I posted a general proceedure in the Jett Support forum.
Nothing magical about breaking in the engine. Just let it turn up. Use a prop one diameter smaller than what you will be flying with, and run it so it is just slightly rich. For the 90L, 11x6 or 11x7 prop , look for around 14,500 rpm. Just a few tanks of fuel. Then switch to the flight prop and run it another 2-3 times. Find peak rpm, back off 800 rpm or so and let it run.
For flight, back off 800-1000 rpm from ground peak rpm.