Trying to start my 69T120 and got nice fat spark but no gas is getting to the spark plugs, they are both dry. I poured a little bit of gas down each spark plug hole and still won't start. With the air boxes removed I can see gas spitting out of the carbs. When I put my hand over the carb mouth I feel air pushing out (as I kick it over). I don't feel suction - which I think I should feel. I beginning to think the intake cam may be out by 180 degrees ????