2 rings = 39-40m/l per min , 1 ring = 125cc & 85cc 43-45m/l per min, plain face = 160cc & 170cc 45-47m/l per min,
4 ring = 40 - 42m/l per min , I read somewhere that the VSX 160 cc had 25 percent more Torque with the larger intake snorkel and straight carb manifold and the ones I've seen have the 2 ring jet.

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