Suzuki DRZ400S DRZ400 DRZ 400 S Custom Pilot Main Carburetor Carb Stage 1-7 Jet Kit Increased Performance at all RPM's, Faster Throttle Response, & Stops Lean Exhaust Popping that Damages Engines. Each Jet Kit is Custom Made to your Specifications for Optimum Performance, When You Order, Please EMAIL US FIRST through Amazon with Your Exact Year, Model, Modifications Made, & Elevation, So we can Design, Build, & Ship Your Kit. The kit comes with complete instructions for installation. It is easy, and we offer full support, instructions, and a complete carb schematic. Only basic hand tools are required. Kit Includes: Main Jets, Pilot Jet, Needle Adjusters, Accelerator Pump Modification, Nylon Spacers, Drill Bits, 3x3 Airbox Modification, Exhaust Modification, Slide Hole mod (with CV carb), Idle Mixture mod, Slide Spring Mod (with CV carb), Carb Schematic, Specifications, Carb Sync Tool build, Carb Cleaning Procedure, Proper Tuning Techniques, and step by step instructions with photos. We give a 100% Satisfaction Guarantee. Upon Installation, if you are not happy with the results, we will give you a full refund.