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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 350 ATV (1987-1999)
The Yamaha Big Bear 350, produced from 1987 to 1999, was a robust utility ATV known for its capabilities. It featured a consistent 348cc (often rounded to 350cc) single-cylinder, 4-stroke, SOHC, air-cooled engine throughout its production.
Initially, the Big Bear 350 was exclusively offered as a 4x4 model. A notable change occurred in 1997 with the introduction of a 2x4 version, expanding drivetrain options. Concurrently, the shifter location was moved lower, closer to the engine, and later models incorporated a "super low first gear" instead of a separate low-range sub-transmission. Despite these transmission and drivetrain updates, the core engine design remained unchanged across the entire 1987-1999 range. FAQ:
Q: How can I ensure parts compatibility for my Big Bear 350?
R: Parts compatibility can vary by year and trim (2x4 or 4x4) of your ATV. Please use our year and model selector to find the exact parts for your vehicle.
Maintenance
| Component | Interval | Details |
| Oil Filter | With every oil change | Some sources suggest changing oil and filter annually or every 10 000 km. |
| Spark Plug | Inspect and replace as needed | Consult the owner's manual for the precise interval. Weak spark can lead to incomplete combustion. |
| Air Filter | Every 12 months or every 100 hours | Replace more frequently if used in dusty or muddy conditions. Regular cleaning is essential. |
| Coolant | Check level regularly. Change at least annually or every 8 000 km. | Use an ethylene glycol antifreeze with corrosion inhibitors for aluminum engines, mixed 1:1 with distilled water. |
| Belt | Not applicable | The Yamaha Big Bear 350 typically uses a shaft drive system, not a belt for the main transmission. |