DYNOJET Jet Kit - Yamaha YZ250F 4132

Carburetor jetting is one of the most direct ways to unlock hidden horsepower in your YZ250F—especially if you've modified your intake or exhaust. The DYNOJET Jet Kit gives you precise fuel mapping across multiple stages, allowing you to dial in the perfect air-fuel ratio for your specific setup without guesswork. Whether you're chasing 5% gains on a stock engine or 15% on a race-prepped motor, this fully adjustable kit adapts to your build.

Stage Breakdown:

• Stage 1: Stock engine, stock/modified pipes – 5% power increase
• Stage 2: Stock/mild modified engine, stock/modified pipes and filters – 8% power increase
• Stage 3: Stock/mild modified engine, individual air filters – 10-15% power increase; driveability may be compromised on some motors
• Stage 7: Race-only tuning for high-RPM applications; not street-legal

Technical Specifications:

• Manufacturer Part Number: 4132
• Vehicle: Yamaha YZ250F
• Fully adjustable jetting
• Bolt-on installation
• Optimizes power delivery
• Improves drivability
• Stage-specific tuning
• Compatible with modified intakes/exhausts