I just bought a 89 XLH 883 from a lein sale. I am getting spark to both cylinders, but only the rear hole is firing good. It has a Mikuni Carb and I kinda think it's just pooring gas down the hole. The front plug is really wet. I don't have any history on the bike. The guy that owned it left it in a storage unit. It also back fires thru the carb. Any Ideas?