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hey i just bought a 98 mxz 500 rotax with rave for a spare and for the kids bought her as is knowing it wont start. so i got her in the garage now pulled the plugs and checked the spark and the spark seems a bit weird to me like when i pulled her over she wont show spark everytime maybe every second pull she would show spark any ideas what to do before i buys a coil or anything .......