I put a windowed piston in my qt50 and am trying to get it to play nice. It will start up fine and if I let it idle, it will idle for 10 minutes or so and then eventually die - usually with a - I'll refer to it as a backfire - out the exhaust. If I give it throttle, it will do the same thing much sooner. It also seems to be running very rich. I'm sure I've changed the timing by adding this piston and am wondering if I can make it work adjusting the timing on the engine. Or perhaps make it work through some other method.
I've tried a range of jets including a very small one to no avail. I've searched the army but could only find a post on whether windowed pistons were noisier than non-windowed pistons.