1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your 6 Sigma Jet Kit for Yamaha YZ65 motorcycles. This custom-made jet kit is designed to optimize your carburetor's performance, ensuring maximum power output and extended engine life, especially after modifications to your exhaust or intake system.
Installing a jet kit is essential to prevent a lean running condition, which can lead to engine damage due to excessive heat. Our kit addresses all throttle positions, improving throttle response and overall performance that you will notice immediately.
Figure 1: 6 Sigma Jet Kit packaging, illustrating the kit contents and the performance benefits, including horsepower gains across the RPM range.
2. Setup and Installation
The 6 Sigma Jet Kit is custom-designed for your specific motorcycle and its modifications. To ensure the correct kit is provided, it is crucial to furnish the necessary information after purchase.
2.1 Providing Customization Details
After purchasing your jet kit, please email 6SigmaJetKits@gmail.com with the following exact details:
- Exact Year of your Yamaha YZ65.
- Exact Model of your Yamaha YZ65.
- Modifications Made to your motorcycle (e.g., aftermarket exhaust, intake).
- Your typical Riding Elevation.
Figure 2: Important instructions for providing motorcycle details to ensure the correct custom jet kit is designed and shipped.
2.2 Kit Contents
Your 6 Sigma Jet Kit includes all necessary components for a comprehensive carburetor tuning:
- Main Jets
- Pilot Jet
- Needle Adjusters
- Nylon Spacers
- Drill Bits for: Slide Hole Mod (with CV carb), Idle Mixture Mod, Slide Spring Mod (with CV carb)
- Carb Schematic
- Specifications
- Carb Synchronizer Tool (instructions on how to build for $5)
- Carb Cleaning Procedure
- Proper Tuning Techniques
- Step-by-step instructions with photos
2.3 Installation Process
The kit comes with complete, easy-to-follow instructions for installation. Only basic hand tools are required. Full support is available if needed. Refer to the detailed step-by-step guide included in your kit for specific procedures tailored to your motorcycle.
3. Operation and Performance Benefits
Once properly installed, your 6 Sigma Jet Kit will significantly enhance your motorcycle's performance and engine longevity:
- Increased Performance: Designed to improve all RPM ranges of performance and throttle response. You can expect to feel a noticeable difference in power delivery.
- More Peak Horsepower: The kit is designed to gain 6%-8% in horsepower with intake/exhaust modifications, and 2-3% on a bone stock setup.
- Longer Engine Life: By correcting the air/fuel mixture, the engine runs cooler, which increases the lifespan of engine components and prevents damage from lean conditions.
- Reduced Exhaust Popping: The kit stops lean exhaust popping, a common indicator of a lean condition that can damage engines.
- Lower EGT's (Exhaust Gas Temperatures): Crucial for modified bikes, as running lean causes detonation and hotter temperatures, which can ruin exhaust valves and destroy engines.
The comprehensive nature of this jet kit ensures that all throttle positions are addressed, unlike simply replacing main jets which only affects full throttle.
4. Maintenance
Maintaining your carburetor and jet kit is essential for continued optimal performance. Your kit includes a detailed "Carb Cleaning Procedure" to guide you through proper carburetor maintenance.
- Regularly clean your carburetor according to the provided instructions to prevent fuel deposits and blockages.
- Ensure your air filter is clean and properly maintained to prevent dirt from entering the carburetor.
- Periodically check fuel lines and connections for leaks or blockages.
- If you make further modifications to your engine or riding environment changes significantly (e.g., large elevation changes), re-evaluate your jetting needs.
5. Troubleshooting
This section addresses common issues you might encounter after jet kit installation or during general operation. Always refer to the detailed tuning techniques and schematic provided with your kit for specific guidance.
5.1 Common Symptoms and Solutions
| Symptom | Possible Cause | Solution |
|---|---|---|
| Exhaust Popping / Backfiring | Engine running too lean, especially on deceleration. | Verify idle mixture screw setting. Ensure pilot jet is clear and correctly sized. Check for exhaust leaks. |
| Poor Throttle Response / Hesitation | Incorrect needle setting or pilot circuit issue. | Adjust needle clip position. Clean pilot jet. Ensure slide hole modification is correct. |
| Lack of Power at High RPM | Main jet too small or restricted fuel flow. | Verify main jet size. Check fuel filter and fuel lines for blockages. |
| Engine Runs Rough / Fouls Plugs | Engine running too rich. | Check main jet, pilot jet, and needle settings. Ensure air filter is clean and not overly restrictive. |
For detailed tuning procedures and specific adjustments, refer to the "Proper Tuning Techniques" guide and the Carb Schematic included with your 6 Sigma Jet Kit.
6. Specifications
| Attribute | Detail |
|---|---|
| Product Name | 6 Sigma Jet Kit YZ65 YZ 65 Custom Carburetor Carb Stage 1-2-3-7 Fits Yamaha |
| Brand | 6 Sigma |
| Model Number | 689338035658 |
| ASIN | B084P64KHB |
| Manufacturer | 6 Sigma |
| First Available | February 11, 2020 |
| Category | Powersports Fuel Jet Systems |
7. Support & Warranty
7.1 Technical Support
For any questions regarding the installation, tuning, or operation of your 6 Sigma Jet Kit, comprehensive support is available. Please contact 6 Sigma directly via email:
6SigmaJetKits@gmail.com
When contacting support, please have your motorcycle's year, model, modifications, and riding elevation readily available, as this information is crucial for accurate assistance.
7.2 Warranty Information
Specific warranty details for the 6 Sigma Jet Kit are provided by the manufacturer. Please refer to the documentation included with your product or contact 6 Sigma directly at the support email address provided above for the most current warranty terms and conditions.
Legal Disclaimer: Please check your local laws before purchasing and installing this product.
