ORIGINAL: bigedmustafa
...I always joke that there are two kinds of glow pilots; those who only fly O.S. Max and those who actually know how to tune an engine...
I love that! I know a few people that fit that statement.
I've found the Super Tigers to be long lived engines unless you get some bad fuel. I was running some fuel from the LHS that evidently the manufacturer lied about the oil content and had 3 engines burn up. The ST lasted the longest before the ring went while my OS .46 AX peeled the coating off the cylinder in about 25 - 30 flights. I'm now running fuel with 50/50 synthetic/castor. My last GS-40 took over a 1/2 gallon on the bench to break-in to the point where it could be flown and has been running stronger with more flight time. Best starting engine I have, goes on the first or second flip all the time!
A couple of tricks I've learned: to get a Super Tiger to tune and throttle good is to scavenge the exhaust from the cylinder (when I changed to a Macs Muffler on my GS 40 it started throttling reliably, no hesitation and slightly better top end), and to run fuel with 50% castor in the oil mixture.
Big Ed, have you tried a Macs muffler yet? If not, give one a try - I've had very good results with it.
Hogflyer