I have a home built chopper. It has a 1986 evo motor. I had put stable in the tank and had stored it for 6 months. I tried to start it and the starter cranks and turns over but it doesnt catch. I have spark, took apart the mikuni carb and cleaned it and it is getting fuel. Battery is fully charged. I also dumped the old fuel and put fresh in. Have two new plugs in as well. Anyone have any ideas on what Im missing?