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Information: Note quite standard tune because I VMX race it. 1.5mm off top of intake port, 2mm off top of exhaust port, advanced spark by 3.5 degrees, custom air box, removed baffles from expansion chamber, added taper and stinger pipe. Super reliable apart from rust flakes in tank, hence the large fuel filter. Still qualifies in N.Z. for pre75 racing but in the 250 or recreational class.
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