Overview Reviews Product Description Stage 1: stock engine/filters, stock/modified pipes; about a 5% power increase Increases power and drivability Fully adjustable. JETKIT YAM YZ450F Product Videos Custom Field Product Reviews Write a Review Write a Review × DYNOJET Dynojet Jet Kit - Stage 1 - Yamaha 4117 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *
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