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never seen a two stroke with two spark plugs would like to see pics of that.
1972 marked the year when Yamaha first produced engines with reed valves, called Torque Induction. This system helped deliver more low-end power and quicker engine response over the entire RPM range. All 1972 MX and Enduro models had reed valves, except the JT-2 Mini Enduro, which had rotary valve induction. This was also the first year for CD ignition, which came standard on the RT2-MX (360cc).