Janus 450 Stock tuner unit

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Ships May / June 2026

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Janus 450 Stock Tune (Phoenix • Griffin • Halcyon)

 

Fix the Mid-Range. Make the Bike Feel Right.

If your Janus 450 feels like it has a dead spot, pulsing, or hesitation in the middle of the RPM range—you’re not imagining it.

That’s coming from the factory fueling.

 

 

What’s Going On (Simple Version)

We ran a stock Janus 450 on the dyno.

The engine is running too rich in the mid-range

• Around 4,000–6,000 RPM,
• the air/fuel ratio is about 11–12:1

 

In plain terms:

 

It’s getting more fuel than it needs.

 

 

How That Feels When You Ride

 

That extra fuel causes:

 

• A pulsing or surging feeling
• Sluggish throttle response
• A “flat” spot in the power
• Uneven acceleration

 

Right in the RPM range you use the most.

 

 

What This Tune Does

 

This plug-and-play tuner corrects that fueling.

You’ll Feel:

 

• Smoother power through the mid-range
• Better throttle response
• More consistent acceleration
• A bike that just feels “right”

 

Plug & Play — No Hassle

 

• Installs in under 5 minutes
• Plugs directly into your injector connector
• No permanent changes to the bike

 

Fitment

 

• Designed for stock Janus 450 bikes only
• (Phoenix, Griffin, Halcyon)
• Not for bikes with performance exhausts

 

 

 

FAQ (Straight Answers)

 

 Q: Will this hurt my engine?

No. This tune is designed to improve how the engine runs—not stress it.

 

Q: Is this hard to install?

No. If you can plug in a connector, you can install this. It takes about 5 minutes.

 

Q: Do I need to adjust anything after installing it?

No. It’s fully plug-and-play.

 

Q: Will this work with an aftermarket exhaust?

Yes, but it will require changing the settings on this tuner. This tuner comes with instruction on how to change it for performance exhausts.

 

Q: What’s the biggest difference I’ll notice?

 

The mid-range smoothness. The bike will feel more responsive and consistent instead of pulsing or hesitating.

 

Bottom Line

 

The engine is solid.

The fueling just needs help.

This fixes it.

 

This tuner comes with:

-O2 sensor extension

-Mounting box

-Three instruction sheets. How to install the sensor extension, how to install the tuner, and a setting and adjustment guide.