Can anyone recomend some good info sites on YS troubleshooting, I have a .63 that ran perfectly out of the box, until the third gallon, it just suddenly quit inflight, and now it's been a real turd, very unpredictable cannot trust it, this last time out it would not even start, just kinda ran on the starter and was blowing fuel out carb and exhaust. any resource helps for troubleshooting would be appreciated..............