The oil cooler would be the most effective since oil will dissipate the most heat. The cooler you want is a flow through type mounted high enough to catch air. I have one on my 210 gy6 and compared to my son's 185 gy6 without one, my engine runs 15deg cooler than his. We checked both after a hard 45 minute ride using an infrared point and shoot thermometer at the head. I'm also at 13:1 ratio with 260psi as compared to his 10:1 180psi. His head checked @345 deg. as compared to mine @ 330 deg. The power it takes for the stator to produce amperage the less power the engine has performance wise.
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