Moose Jet Kit for Yamaha Stage 1, 2 & 3

Stage 1 Kits: Designed for ATV's with stock engines using the stock airbox, air filter and stock or aftermarket exhaust. Fully adjustable to allow for the use of well-designed aftermarket exhausts and stock replacement air filters. Improve throttle response and drivability. Power increases of approximately 5 throughout the entire power range.
Stage 2 Kits: Designed for ATV's with stock or mildly modified engines using well-designed stock or aftermarket exhausts with a modified airbox and a stock or replacement air filter. For applications where individual air filters cannot be installed and where airbox modifications improve overall engine performance. A power increase of 8 can be achieved in most cases.
Stage 3 Kit: Designed for ATV's with stock or mildly modified engines using individual air filters and a stock or aftermarket exhaust. In most cases power increases of 10-15; drivability may be compromised in short-stoke high-rmp motors. On some modern engine and airbox designs, individual filters and proper jetting offer no performance improvement and compromose drivability; Stage 3 kits are not available in such cases.