Terry
I just tore my 91 VAC's down for winter storage and they were both like new inside.
I'm not sure exactly how much fuel I ran through them this year but they have been run hard.
I'm running good old RedMax stock blend 18%, nothing special.
Are you sure your not trying to run them to hot?
Tim
Pretty sure Red Max has some castor, no? Did you get it from Mike H?
Thought of that, I know I have to be careful to adjust the flow as I start to lean the needle down.
Not convinced 100% yet but think the castor is helping. I guess the answer to my orignal question has been answered!
I'm not 100% sure but I think it's 18% syn , no castor.