As with ALL YS motors run it in the right RPM range I like 8300-8700 on the 140-160's. This is where they make the best power.

I use the 17-12 std APC on Cool Power 30% and the motor will turn up at 8700-8800 and have excellent results. I have one that has well over 500-600 runs and all that has been done is new ring at about 300 flights and it just got a new rebuild...Piston-ring and liner. Cam and bearings were all great so I didn't change them.

I have another motor that is approaching about 150-200 flights. Its running the same.

If you choose less nitro then downsize the prop. Other choices I have run:

all of these are APC
17-12W
18-10PN
17-13
16.5-13W
15.75-13 3B
15-13W 3B
15.5-12 4B


Key is to keep the RPMs in the right range...This will keep the motor happy and not work it so hard.