Fits YAMAHA YFM400 BIG BEAR IRS 07-12Stage 1Stage 1 kit are intended for motorcycles with a stock engine using the stock airbox, air filter and stock pipeDynojet carburetor jet kit can provide you with a simple and affordable solution to all your carburetion problems. Dynojet kits increase power and smoothness throughout the entire rev range, while maintaining optimum fuel economy. Dynojet stage 1 kits are fully adjustable to allow the use of a well designed aftermarket pipes and stock replacement air filters, stage 1 kits are designed to improve throttle response and driveability and in most cases power increases of approximately 5 percent throughout the entire power range can be achieved. Dynojet stage 2 kits are designed for applications where individual filters cannot be installed and for applications where airbox modification improves the engine's performance, in most cases power increases of approximately 8 percent can be achieved. Each Dynojet jet kit includes comprehensive instructions which show step-by-step installation and testing procedures to ensure a perfect setup every time.
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