I found running massive mods fuel in my techwell .12 gave me a lot more life out of it. Great motor for the price. I also had a play with an old one that I had by doing some crank work and fitting a novarossi S3 piston and liner (fits straight in using the techwell con rod) and found it to be keeping with open motors worth 4 times the amount. My next step is to take the pull start off and see how quick it is as an open motor.