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Description
Take your performance to new heights with a Jet Kit for your vehicles. Increase power and improve performance throughout the entire RPM range, while improving throttle response and smoothness. These Jet Kits take the guesswork out of tuning your vehicles.
Whether you’re rolling with a stock vehicles or you’ve made some modifications, our Jet Kit will optimize your air/fuel ratio to eliminate rough spots and help you take control of your vehicles’s power. You can go with a Stage 1 Jet Kit to give your stock engine a 5% boost of horsepower or send it all the way up to Stage 3 if you’ve already made major modifications to your vehicles.
STAGE 1 DETAILS
Perfect for vehicles with a stock engine using the stock airbox, air filter, and pipes. Stage 1 Jet Kits are engineered to improve throttle response and deliver approximately 5% more horsepower than stock. These kits are fully adjustable to allow the use of well-designed aftermarket pipes and stock replacement air filters, like K&N.
STAGE 2 DETAILS
If you’ve made slight modifications to your vehicles, but still crave more performance, a Stage 2 Jet Kit is the solution. With a Stage 2 Jet Kit, you could see power gains of approximately 8%. This kit is intended for vehicles with stock or mildly tuned engines using a well - designed aftermarket pipe with a modified airbox and a stock replacement air filter.
FEATURES
- 5-8% power range.
- Fully adjustable.
- Increases power and drivability.
- For carbureted vehicles only.
Technical Specifications
- MFG. Part Number 3243
Vehicle Information
Yamaha Big Bear 400 ATV (2000-2012)
The Yamaha Big Bear 400, produced from 2000 to 2012, is a robust utility ATV known for its reliability and consistent performance. It features a durable 386cc, single-cylinder, 4-stroke, air/oil-cooled SOHC engine, paired with a 5-speed transmission with reverse. This model was designed to handle various tasks and terrains, making it a popular choice for work and recreation. While the core engine remained consistent, significant enhancements were introduced during its production run. Notably, around 2006, Independent Rear Suspension (IRS) became available on 4x4 models, greatly improving ride comfort and terrain capability. The 4WD system also evolved, with later models featuring Yamaha's "On-Command" selectable 2WD/4WD system, offering greater versatility. FAQ:
Q: How do I ensure I select the correct parts for my Big Bear 400?
A: To guarantee a perfect fit, please use the year and edition selector at the top of this page. This will filter parts specifically compatible with your ATV's configuration.
Maintenance
| Component | Interval | Details |
| Engine Oil | Initially 1 month, then every 6 months | Replace |
| Engine Oil Filter | Initially 1 month, then every 6 months | Replace |
| Air Filter | Clean every 20 to 40 hours. Replace if necessary. | More frequently in wet or dusty conditions. |
| Spark Plug | Initially 1 month, then every 6 months. Replace if necessary. | Check condition, adjust gap, clean. |
| Coolant | Check for leaks initially 1 month, then every 6 months. Replace every 24 months. | Repair leaks if necessary. |
| Belt (V-belt) | Every 12 months or 2,400 km | Check for cracks or damage. |