ive fixed many mowers in the past and seen all kinds of them. aswell as sizes. but this thing. its almost brand new aswell and wont start. it has spark. carbs spotless. fresh gas, and if you put your hand over the airfilter hole it wants to start. has plenty of compression. its also the first time ive seen a pure plastic carb besides lawnboys. has anyone else worked on one of these briggs & stratton engines before? its about less then a year old so it shouldnt really be doing this.