I have an 84 honda nighthawk 650. The bike was returned to us, from the police, after being stolen, and well there were a few things broken. The bike was then stored for 3-4 years. I changed the oil, added new spark plugs. When i changed the spark plug on the cylinder to the far left i found that the treads were bad. I was using the proper plug size, so i eased it down in. Also the choke plunger on the carborator that feeds that cylinder is broke, so the choke is always on, on that carb. When i started the bike i did find that one cylinder wasnt fireing. It was that cylinder with all the previous problems. It makes more of a poping and cracking noise. Does anyone know how to fix this???