Introduction
This manual provides detailed instructions for the installation, operation, maintenance, and troubleshooting of your NIBBI Motorcycle 520F19 Drive Chain. Please read this manual carefully before use to ensure correct installation and optimal performance.
The NIBBI 520F19 Drive Chain is designed for 300cc-600cc engines, suitable for various motorcycles including Yamaha, KTM, Motocross, ATV, and Pit Dirt Bikes. This manual also includes tuning information for compatible NIBBI carburetors.
Safety Information
- Clean Environment: This is a high-precision processed product. If work is required on it, ensure it is done in a clean environment.
- Professional Advice: Carburetor function is affected by factors such as air pressure, temperature, humidity, and altitude. Its setup requires knowledge and understanding. If you lack either, contact a professional for advice.
- No Open Flames: Make sure to stay clear of open flames to avoid unwanted fires.
- Secure Installation: Ensure all screws are tightened properly before starting the engine.
- Manufacturer Responsibility: If the carburetor is damaged during adjustment or disassembly, the manufacturer does not accept responsibility.
Package Contents
The package typically includes:
- NIBBI 520F19 Drive Chain (available in 114, 116, 118, or 120 links depending on selection)
- Connecting Link (Master Link)
- Assembly Instructions (this manual)
- Carburetor (if included with specific kit)
Refer to the main product image for visual confirmation of included items.
Image: NIBBI 520 PRO Motocross Chain with packaging and connecting link.
Setup and Installation
Chain Installation
The NIBBI 520F19 Drive Chain is designed for easy installation. Ensure your motorcycle is on a stable stand and the engine is off before beginning. Always consult your motorcycle's specific service manual for detailed chain replacement procedures.
- Remove the old chain (if applicable).
- Route the new NIBBI 520F19 chain around the front sprocket, over the swingarm, and around the rear sprocket.
- Bring the two ends of the chain together and connect them using the provided master link.
- Install the clip onto the master link to secure it. Ensure the open end of the clip faces away from the direction of chain travel.
- Adjust chain tension according to your motorcycle's specifications.
- Double-check all connections and tension before riding.
Image: Close-up of the NIBBI 520 PRO chain links, showing the "NIBBI" branding.
Image: The NIBBI chain master link components, including the side plate and clip.
Carburetor Installation (for NIBBI Carburetors, if applicable)
If your NIBBI 520F19 Drive Chain kit includes a carburetor, or if you are installing a NIBBI carburetor, follow these general steps for installation. Always refer to the specific carburetor instructions for your model.
- Ensure the engine is cool and the fuel supply is turned off.
- Remove the old carburetor (if replacing).
- Install the new NIBBI carburetor, ensuring all gaskets and seals are correctly seated.
- Connect the manifold, accelerator cable, throttle cable, and air filter to the carburetor.
- Secure all connections and hoses.
- Turn on the fuel supply and check for leaks.
Accessory Components:
- Carburetor
- Assembly instructions
Option Accessory Components:
- Manifold
- Accelerator
- Throttle Cable
- Air Filter
- Main Jet
- Pilot Jet
Image: Diagram of a NIBBI Carburetor (PWK Racing Series) with key dimensions and components labeled.
Operation and Tuning (NIBBI Carburetors)
Optimal performance of your NIBBI carburetor requires careful tuning. The following sections provide guidance on basic tuning principles.
Option Parts Specification (PWK Racing Series)
| Pilot Jet | Sizes |
|---|---|
| #30 | #32, #34 |
| #35 | #36, #37 |
| #38 | #39, #40 |
| #41 | #42, #45 |
| #48 |
| Main Jet | Sizes |
|---|---|
| #100 | #115, #130, #148 |
| #102 | #118, #132, #150 |
| #105 | #120, #135, #152 |
| #108 | #122, #138, #155 |
| #110 | #125, #140, #158 |
| #112 | #128, #145, #160 |
| #165 |
Original Setting (PWK Racing Series)
| Carburetor (mm) | Stroke | Air Screw (turns out) | Jet Needle | Main Jet | Pilot Jet |
|---|---|---|---|---|---|
| 24 | 1.5 | 1.5 | 3 | #98 | #32 |
| 26 | 1.5 | 1.5 | 3 | #112 | #32 |
| 28 | 1.5 | 1.5 | 3 | #118 | #32 |
| 30 | 1.5 | 1.5 | 3 | #120 | #32 |
| 32 | 1.5 | 1.5 | 3 | #128 | #32 |
| 34 | 1.5 | 1.5 | 3 | #132 | #32 |
Basic Tuning Common Sense
- Air Screw: Clockwise rotation of the air mix screw will enrich the mixture; anti-clockwise rotation will lean the mixture.
- Main Jet: The bigger the main jet, the richer the fuel.
- Power Jet: The bigger the power jet, the richer the fuel.
- Pilot Jet: The bigger the slow jet, the richer the fuel.
- Jet Needle: There are five options per needle; the higher the number, the richer the mixture. The throttle valve is inversely proportional to the fuel concentration.
- Throttle Valve: If the throttle valve angle is small, the fuel is rich; otherwise, the fuel is lean.
The Throttle Valve Opening
- For throttle closed to one quarter throttle opening:
- Running in a low speed: Adjust air adjustment screw to adjust mixture.
- According to the air input, change slow jet to adjust mixture.
- From one quarter throttle opening to three quarter throttle opening:
- Running in a middle speed: Adjust jet needle position to adjust mixture.
- According to the air input, change needle to adjust mixture.
- From three quarter throttle opening to full throttle:
- According to the air input, change main jet to adjust mixture.
- Running in high speed: Change power jet to adjust mixture.
- Half throttle to full throttle (high air speed in the carb):
- Adjust mixture by changing main jet, jet needle, or jet needle setting.
- Make sure to read the spark plug to check whether setting is correct or not.
Basic Tuning Notes
- Basic jetting of the air screw is fully in, then 1 and a half turns out. If the engine runs too rich or too lean, try to adjust with the air screw. If this cannot be done within a few turns of the screw, change the slow jet.
- If mixture is too rich between closed and half throttle, and if this cannot be rectified with the air adjustment screw, go to a smaller slow jet.
- Running your engine too rich will result in your engine not running at its best. Running it too lean will eventually damage your engine's components such as the piston, cylinder, and head. We therefore recommend starting on the rich side when you set up your engine and work your way down to the proper setting.
- Check and read the spark plug to learn about the mixture your engine requires.
- Spark plug in black, or even wet: Your engine runs too rich. Unburnt fuel causes soot to build up on the spark plug.
- Spark plug is dry and grey, or even white: Your engine runs too lean. This may lead to damage of engine components such as piston, cylinder, head, and spark plug caused by overheating. Go for a richer setting, use larger jets.
- The spark plug is brown and looks clear: Mixture is as it should be.
- When changing to a larger main jet, this will affect your engine's performance at half to full throttle. Always change one factor at a time and assess the changes this has made to the engine's performance before changing something else.
- If you run an engine too lean for a longer period, it is likely to overheat and suffer damage.
Natural Environmental Factors
The carburetor's performance is sensitive to environmental conditions. Adjustments may be necessary based on:
- Air pressure
- Temperature
- Humidity
- Altitude (height above sea level)
These factors influence air density, which directly impacts the air-fuel mixture. Be prepared to make minor adjustments to maintain optimal engine performance in varying conditions.
Maintenance
Regular maintenance ensures the longevity and performance of your NIBBI Drive Chain and associated carburetor components.
Drive Chain Maintenance
- Lubrication: Regularly clean and lubricate your drive chain. A well-lubricated chain reduces friction, wear, and extends its lifespan. (Hint from review: "Comes lubed really nice" - check initial lubrication, but regular re-lubrication is essential).
- Tension Check: Periodically check and adjust chain tension. Incorrect tension can lead to premature wear of the chain and sprockets, or even chain derailment.
- Cleaning: Clean the chain regularly, especially after riding in dirty or wet conditions, to remove grit and grime that can accelerate wear.
- Inspection: Inspect the chain for any signs of damage, rust, stiff links, or excessive stretch. Replace the chain if any significant wear or damage is observed.
Carburetor Maintenance (if applicable)
- Cleaning: Periodically clean the carburetor, especially the jets and float bowl, to prevent fuel deposits and blockages.
- Air Filter: Ensure the air filter is clean and properly maintained. A dirty air filter can restrict airflow and affect the air-fuel mixture.
- Fuel Quality: Use clean, fresh fuel to prevent carburetor issues.
Troubleshooting (NIBBI Carburetors)
This section outlines common carburetor problems, their likely causes, and recommended adjustments. Always refer to the spark plug's appearance for mixture assessment.
Basic Tuning Troubleshooting Table
| Problem | States of Mixture | Setting | Notes |
|---|---|---|---|
| When idling, engine runs erratic, RPM not stable | Lean | Turn air screw in clockwise to make mixture richer. Change to a bigger slow jet. | There is a possibility that a reed petal is broken. There may be an air-leak in the inlet tract. |
| When idling, engine is stalled, exhaust fumes are black | Rich | Change to a smaller slow jet. Change to a smaller diameter needle to make mixture leaner. | |
| When riding away, poor acceleration | Lean | Change to a bigger main jet. | |
| When riding away, engine runs erratic | Rich | Change to a smaller main jet. | |
| Between closed throttle and one quarter throttle opening, engine stalls and hesitates | Lean | Go for a thinner needle to make the mixture richer. Turn the air screw in clockwise to make the mixture richer. | This may happen in rainy conditions in particular. Please check Basic knowledge & Adjustment. |
| Between closed throttle and one quarter throttle opening, acceleration is hesitant or irregular | Rich | Change the needle jet to a smaller one to make mixture leaner. | Please check Basic knowledge & Adjustment. |
| Throttle between a quarter and half open, acceleration is bad | Rich | Change the needle jet to a smaller one to make mixture leaner. | Please check Basic knowledge & Adjustment. |
| Throttle is fully open, RPM changes erratically, engine pings, detonation | Lean | Adjust mixture by using a checking spark plug until color is brown. | A piston could be out, too much advance. There may also be an air leak in the inlet tract. |
| Throttle is fully open, engine feels flat, spark plug is black | Rich | Change main jet to a larger one. | Air filter could be blocked. Also check choke is not stuck. |
| Rapid throttle opening | Lean/Lean | Check all parts involved as described above and settlement, don't rush things. | Make sure this is not caused by a broken reed petal or an air leak in the inlet tract. |
Specifications
| Feature | Detail |
|---|---|
| Brand Name | NIBBI |
| Model Name | Motorcycle 520 Drive Chain (520F19) |
| Special Features | Motorcycle 520 Drive Chain |
| External Testing Certification | CE |
| High-concerned chemical | None |
| Origin | Mainland China |
| Fitment | Suzuki KTM 500 EXC Motocross Pit Dirt Bike (and other 300cc-600cc engines) |
| Available Links | 114, 116, 118, 120 Links |
Package Dimensions & Weight
| Measurement | Value |
|---|---|
| Length | 28 cm |
| Width | 12 cm |
| Height | 3 cm |
| Weight | 1.75 kg |
User Tips
- Initial Lubrication: The chain often comes pre-lubricated. However, always check the lubrication upon receipt and apply additional chain lubricant if necessary before first use.
- Chain Type: The provided data does not specify if this is an O-ring or X-ring chain. Please inspect the chain visually or consult the product packaging for this detail if it is critical for your application.
Video Guide
Watch this official NIBBI video for a visual overview of the 520 PRO Motocross Chain, including its components and application on a motorcycle.
Video: NIBBI 520 PRO Motocross Chain product showcase and action shots.
Additional Resources
A detailed user manual in PDF format is available for further reference. This document contains comprehensive guides and specifications for the item.
User manual (PDF): The content of this manual is derived from the official PDF. For the original document, please refer to the seller's product page or contact NIBBI support.
Warranty and Support
For warranty information, technical support, or any product-related inquiries, please contact NIBBI customer service or refer to the official NIBBI website.