Hi I have a ys.63 it has a small problem, which is probable operator airier I am running 30% cool power the problem is. When we start it let run for a few seconds and advance the throttle at about ¾ full it sounds like it has a pre ignition and stops the motor. If we let it warm up good it runs fine love the motor any-way but would like to know what is happening. Thank you in advance

Let it run at 1/4 throttle for about 1 minute to warm up before you advance the throttle.

Thank you i well try that tomorrow and let you know

OK, let me know.

Thanks!

Works Great Thanks Dave

Great!!

Good Flying!