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Old May 5th, 2020, 07:41 AM   #1
TAorama
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2016 Ninja 300 Emissions Removal / Block-off Plate Advice?

Greetings all! I'm working on a 2016 EX300 track-day-only build and am considering removing the Kleen-air emissions mess. I've searched for a good tutorial and haven't seen anything really detailed or definitive as far as how it affects tuning and making other components work together with this mod, so I'll ask! I mean, I've seen the "I took the Kleen system off and installed the block off plate and my exhaust doesn't pop anymore" threads, but how does that REALLY affect the rest of the system?

The bike has a full Yosh R77 exhaust. I've got a PCV on order and I'll get the appropriate map for whatever I do and hopefully actually get it dyne tuned at some point. My debate is, initially, should I install a block-off plate for the Kleen system, and what to do with the O2 sensor? Will the PCV use the data from the O2 sensor or can I toss it? There's a bung for it on the Yosh pipe so it's NBD to keep it. Will the removal of the Kleen system cause more trouble than it's worth?

I'm good with HOW to remove the valves, tubes, etc. I just want to make sure that what I want to do to it and the components I add will not cause more harm than good. If anybody has a complete setup with good results, please let me know what you did and how you made everything work together.

Any input is appreciated! Thanks!
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Old May 5th, 2020, 09:22 AM   #2
DannoXYZ
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Hi and welcome to Ninjette!

Factory O2-sensor is narrowband design and only works at idle and partial-throttle to target stoich 14.7:1 AFR. Once you're into high-load operations +75%, O2-sensor is ignored and only ECU maps are used for fuel & ignition.

So PCV shouldn't be affected in any way since it's really only high-load zones that are affected by any mods you make. Factory O2-sensor is no good there and PCV can't use its data anyway. Even better is to get wideband-O2 with much more accurate feedback on AFR and PCV can use it for auto-tuning in high-load areas. Target 12.5:1 to 13.0:1 AFR for max power. Factory 300 gets an immediate +15% HP gain from leaning out factory mixtures.

As for emissions equipment, they only deal with pumping air into exhaust to clean up mixtures. It doesn't affect power in any way. So it doesn't really matter what you do. Leave it or cap it off.
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Old May 5th, 2020, 11:38 AM   #3
TAorama
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Quote:
Originally Posted by DannoXYZ View Post
Hi and welcome to Ninjette!

Factory O2-sensor is narrowband design and only works at idle and partial-throttle to target stoich 14.7:1 AFR. Once you're into high-load operations +75%, O2-sensor is ignored and only ECU maps are used for fuel & ignition.

So PCV shouldn't be affected in any way since it's really only high-load zones that are affected by any mods you make. Factory O2-sensor is no good there and PCV can't use its data anyway. Even better is to get wideband-O2 with much more accurate feedback on AFR and PCV can use it for auto-tuning in high-load areas. Target 12.5:1 to 13.0:1 AFR for max power. Factory 300 gets an immediate +15% HP gain from leaning out factory mixtures.

As for emissions equipment, they only deal with pumping air into exhaust to clean up mixtures. It doesn't affect power in any way. So it doesn't really matter what you do. Leave it or cap it off.
Outstanding answer! Thanks very much for the insight!
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Old May 21st, 2020, 07:08 AM   #4
JFMNINJA400
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I think I will do the block off plate as well. Waiting for the after market air filter to arrive to see if the popping gets worse. I just have a MG GROWLER slip on. The popping is very minimal now. Might just get the ECU flashed instead of a full dyno tune.

If I do the block off plate and cap off the hose, will there be a check engine light?
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