Dynojet Q618 Jet Kit for Arctic Cat 400I 2X4 02: Automotive. Buy Dynojet Q618 Jet Kit for Arctic Cat 400I 2X4 02: Jets & Jet Kits - ✓ FREE DELIVERY possible on eligible purchases. Fits 02 Arctic Cat 400I 2X4 . Stage 1 . Stage 1 kit are intended for motorcycles with a stock engine using the stock airbox, air filter and stock pipe . carburetor jet kit can provide you with a simple and affordable solution to all your carburetion problems. kits increase power and smoothness throughout the entire rev range, while maintaining optimum fuel economy. 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. 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 jet kit includes comprehensive instructions which show step-by-step installation and testing procedures to ensure a perfect setup every time. This is backed by free telephone and Internet support to customers. . . .