Naraku Racing Ignition Unit CDI - NK390.16
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Product Information
Full details
The Naraku Racing Ignition Unit (NK390.16) is a high-performance CDI designed for owners of 4-stroke engines who seek to remove factory speed limitations and improve overall engine dynamics. It is an ideal upgrade for riders looking to maximize the benefits of aftermarket engine modifications like big-bore cylinder kits; however, users should note that this unit is specifically engineered for performance applications and may require fine-tuning of the carburetor or transmission to achieve optimal results.
All features
| Model Part Number | NK390.16 |
|---|---|
| Brand | Naraku |
Extended Product Information
FAQs
Is this CDI compatible with all 4-stroke engines?
This unit is designed for specific 4-stroke applications. Always verify the connector type and model compatibility with your specific engine variant (NK390.16).
Does this require ECU programming?
No, this is a fixed-curve performance CDI. It is designed for plug-and-play installation without external programming.
Will this damage my stock engine?
While the CDI itself does not damage the engine, operating at higher RPMs increases wear. Ensure your engine is in good mechanical condition.
Can I use this with a stock exhaust?
Yes, but you will see the best performance gains when combined with a free-flowing exhaust and big-bore kit.
What is the primary benefit of the V2 version?
The V2 version features an improved ignition timing map specifically refined for smoother, more consistent power delivery compared to earlier iterations.
Troubleshooting
Engine fails to start after installation
Verify that all harness connectors are fully seated and that the CDI mounting points are secure.
Engine sputters at high RPM
Check your carburetor jetting; the engine may require a richer fuel mixture to match the increased ignition timing.
No noticeable increase in top speed
Ensure that your transmission variator rollers are not too heavy, as they may be preventing the engine from reaching the RPMs where the CDI gains are realized.
Pros and Cons
Pros
- Significantly higher top-speed potential
- Noticeable improvement in throttle response
- Easier starting in various temperature conditions
- Direct replacement for stock components
- Optimized ignition timing for 4-stroke power delivery
Cons
- May require additional tuning of the air/fuel mixture
- Not intended for stock restricted engines without other mods
- Increased engine stress at higher RPMs
Setup, Compatibility & Care
The Naraku NK390.16 is designed as a direct replacement for standard 4-stroke CDI units. Installation involves locating the original CDI box, disconnecting the harness, and plugging in the Naraku unit. Ensure the connection is clean and free of corrosion before mounting. Because this unit removes speed limits, it is highly recommended to monitor engine temperatures and ensure that your drivetrain (rollers/variator) is adjusted to accommodate the new RPM range. Regularly inspect the spark plug to ensure the ignition curve is resulting in proper combustion, as moving to a performance CDI may occasionally require a slightly different heat range spark plug or a minor adjustment to the carburetor jetting.