I bought a 1991 Polaris trail boss 250 2 stroke and I have no idea how the vent lines go off the carb and I don’t know if that is my problem or if it is my timing so I wanted to check both but have no idea how to put the lines or even know where the timing is located and or how to set it. I have been looking forever for videos on how to do both of these but can’t seem to find any. I even looked for the repair manual online but couldn’t find one that I didn’t have to buy.