Just bought a husqvarna yth2av48ls lawn tractor with a briggs endurance v-twin engine. http://www.husqvarna.com/us/landowner/products/garden-tractors/yth24v48ls/ When I start it cold with choke on it takes about 10-15 sec. to fire up, problem is when engine is warm it will not restart with throttle anywhere between low to high area but it did at first, need to put it in choke area when it's warm then it starts. it will almost start in normal throttle area but catches and sputters a bit. Only 5 hours on the mower and this just started happening last 2 hours. Mower is going back to be looked at, just wanted to educate myself better before they tell me its fine. Thanks!