I have a prairie 650 v-twin. I bought it used. it has about 270 hrs on it. I have had the carbs rebuilt and a jet kit installed. I had it running awesome just one day ago. now the rear cylinder is not running. it has spark and all the valves are moving. so i am guessing that everything mechanical is ok. It will run and idle on one cylinder but while it is the rear cylinder will act like it is starting to come on but then goes back to one. the ignitor box makes a small noise but i am having a hard time thinking something is wrong with it because the coil has spark. going to try changing out the plug but i am just not sure what to check after that. i need help please i have spent like a grand on it just at the shop. my email is [email protected]. please help.