Black Widow exhaust installed. Running too lean?

A lot of questions and do not knows. This Black Widow exhaust is some 150 EUR Chinese exhaust which is price tagged with some 350 British Pounds. So if it is okay for you, first ask them what they think about re-mapping?

But the water temp does not give any clue about your temp in the combustion chamber. Forget what you see on the dash. And also do not get carried away about pops and better respond. Most newbies just get the noise and think about power increase.
Such a non adapted, just open tube and far too short exhaust are noisy only and grab a lot of smooth power gain. They may have a bit at top end, but who knows.

So if you like it, ride it, but most riders, in means of riding a motorbike, do not like those noisy pipes. I is up to you what you are at the end...

Are you running the stock o2 sensor in it? If so, it should make minor changes to give you enough fuel so that you're unlikely to cause any problems.

If you're putting on a full system and you're not changing the intake then you should be okay. I would definitely want to re-tune the bike if you're doing both.

manshrew said:

Are you running the stock o2 sensor in it? If so, it should make minor changes to give you enough fuel so that you're unlikely to cause any problems.

Click to expand...

The stock O2 sensor is narrowband, it's only used in steady throttle settings near stoichiometric A/F ratio (cruising on the highway etc). Narrowband sensors rely on the maps in the ECU for proper fueling. Aftermarket wideband O2 sensors can adjust fueling throughout the rev/load range to suit conditions.

@vamaci I don't think it would run lean enough to cause any damage, but it's probably not running optimally.

yea I'm running the stock sensor. The only thing changed is replacing the stock system with the full Black Widow one.

1.DynoJet power commander V
2.DynoJet auto tuner with wide-band O2 sensor

You’ll also need to run your stock O2 sensor along with the wide-band sensor which will have to be welded into your header somewhere close to the stock sensor and that will solve all your issues.
you’ll piggyback the auto tuner to the power commander to your stock ECU 👍🏻