Milcent

I flew my "Baron" with a FS30 since 2 weeks now. I have 10 tanks flights. I broke twice the exhaust valve spring, one with a 9x6 propeller after 4 tanks during the break in and the second after 4 flights with a 10x4 propeller.
I have a friend who had the same problem.

I use Power Master 10% fuel, the same for Saito 72 and 56 4 Stroke with no problem.

I wonder if any of you ever hear about this problem : i believe it is a problem with the spring itself that doesn't support well the heat in the engine ???

Thanks for your advices.

Pierre.