I have recently purchased a next to new stock 2018 Tomos Sprint. Under 50 kilometers. I brought it home and started to tune the carb thinking thats all it will really need being new. Rode it with choke to warm it up but as soon as I took off the choke and came to a stop the engine cut out. I drained the tank thinking the gas could be 2 years old now and took the carb off to clean it thinking the pilot jet was clogged. Carb was spotless and so was the pilot jet. Cleaned it anyway but still no change. I called a local shop for some advice and he told me that he stopped working on them once Tomos put the "crazy catalytic converters" into their exhaust systems. He said get an aftermarket exhaust or try drilling some holes in your exhaust to try and release some of the pressure. Looking for some recommendations. Is this what the issue is? Does anyone else have this issue? If so, what exhaust do you recommend? What size jets (even larger carb?) should I use for the new exhaust?