2023+ Kawasaki ZX-4RR Shoots Flames! Dyno Day + Power Gains 

That Akra made the bike sound terrific, really brings it to life. Well done

I hope Yamaha comes into the game. Regardless, I love the old gray import tiny gems from the 80s/90s.. but they just don't compare to this! 70+ HP out of a ( road legal) 400 CC. Sexy beast.

Great work guys. I'm excited to see the potential you guys can unleash from this awesome bike.

Wow 70hp on wheel from 400cc 4cyl amazing job👏🏻👏🏻

So glad to see the potential of this machine being realised. Good journey!

Best sounding 400cc👌

This bike is all about the sound, very cool 😎 !

It’s the bike a newbie can easily grow into, an ECU with intake and exhaust 😅 completely new beast 😅😂❤

Sounds fantastic 👌

I love TST. You guys just keep pushing and pushing!!

Wow that bike sounds awesome dam man just not Kawasaki guy but hand down

What a beautiful tune

I’ll say, as a Florida boy on a 600RR next bike I want to bring to you. Next bike… Aprilia RSV4 factory. Want that Bart magic!

that sound!!

Blows my mind how strong chains are. Can't imagine a chain breaking at 14,000rpm.

cant wait for the actual performance comparison !

awesome, thanks bart I can't wait to get the unrestricted tune on it.

That sound is bruuutallllllll!

Akra has the 250rr exhaust but no 400rr offering yet. I do know another tuner got about 72hp out of it by losing restrictions and using an Akra exhaust. Specifically a header from their 250rr offering and a slip on. I could’ve swore I’ve heard of the 250rr hitting 100hp somewhere so I’d believe if a 400rr specific exhaust, maybe a specific dna air filter and this 400rr could hit 3 digits as well. I really do want it to since it is so light with a short wheel base. Super fun on the track and flickable…hoping for a black mode to come out in 2024, i love kawasaki, but, krt green ain’t for me. Make it in all black and drop the price $1k and I’ll grab it.

Hell yeah keep it coming!

im about too get the stage 1 from you guys for mine well see

Those are great gains. Especially, since thats not the exhaust thats meant for it. When a full zx4rr exhaust comes out, should gain a even more ponies.

53 hp is the maximum allowed for a JDM 400cc bike sold in Japan. They have tiered licencing 50/250/400cc and unlimited. Stepping up to an Unlimited(Ogata) licence in Japan cost real money. Most people there top out at 400CCs

Are you developing a full exhaust system that’s is tailored to the zx-4rr? If so when do you think it may be ready for testing and when will it be offers for sale. Nice work fellas! Thanks

Looks like you guys are going to have a lot of fun with the tuning project can't imagine how fun when you get it on the track awsome

I saw where others are have as favorable or better tuning results with akra silencer and stock header. Will you guys explore that ?

I'm looking forward to seeing the ZX6R 2024 get on the dyno because I've heard that it cuts the horsepower down to pass the emission standards.

Hasn't been out for that long and it's already full send 😂👌

Kafam bozulduğunda açıyorum şu makınanın sesini dinliyorum moralim düzeliyor

4 a 400 that's a sick bike. Way to go kawasaki

Esas revoluciones 😍😍😍🔥🔥🔥

So cool to see the curves and numbers!

It sounds Fantastic. I was going to get a Ninja 400 for my First Bike but i think i want this instead

MUSIC 🎶🎶 to my ears 😌

Dam and double dam. Zx4rr seems like a gem, the bike yamaha should have built. Pretty impressive

Comprehensive video guys 👍 The Akra sounds beautiful all the way to the redline, also the point you made about the upshift rev drop always landing in the power band really will make it a serious weapon. Just need to get some idea on when this is available in the UK - does anyone know?

After remaping my honda varadero 125 15 hp i gained 3 hp now 18 hp cost me 250 pound i have full scorpion system on board and upgraded air filter so bike running 19 hp over all but if I want power I got a 500 cc

I’m drooling over here🤤

That sound ❤❤❤❤

The sound like ZX6R tho 🔥

I wonder what numbers the Yoshimura Hepta Force TSS from the ZX25R would do on the ZX4RR..only bc I love the way the hepta force looks on the ZX25R

Thank for the new video

So glad you guys picked one up! Next dream bike after I sell my arm upgrading the R3. 😅

My goodness what a crazy bike lol

todo ese poder termina recayendo en esa cadena de trasmisión

Great video! Did you ever make that video on slip on Vs full system + tune for a 600cc?

why is it soooo gooooooood

Hey guys, on the Kawasaki website it says max power 77hp at 14,5k rpm. Why are his measurements so much lower, even with tuning?

My dream bike

Essa moto é top a hora que sair a nekd então vai vender igual água.

One of the best commerce oriented videos I've seen. Few questions: 1. Is this power to the wheel? 2. These power curves start dropping steeply before 15k RPM, and they only go up to like 15100 RPM. Is it so because you had let-off after 14k? Or, is this a bit of a 2006 R6 case where the actual RPM is lower than indicated on the dash? 3. I see your tune raised the redline. Do you think such a change would be safe, and / or wouldn't compromise long-term reliability, with stock engine? Of course, this does depend on how much extra RPM is introduced - so what's the redline now? I imagine this does not contribute to a power increase in any way, since the power drops off much sooner, at least on this tune. How doable it would be to make the power drop later and get the extra gain from the shifted redline? It's a good news to me (as I'm sure to many riders) that you guys will be concentrating on tuning this bike a lot. I think I will be looking to order some of your stuff here to Lithuania, after I get this bike.

I want one of those...

Good stuff! :D

For some reason the usa models are restricted, here in Australia none of that nonsense!

Am I missing something here? He "kicks" down to shift up? I know this bike has a quick shifter, but isn't that just so you can shift the gear without using the clutch? Was there another mod here to reverse the shifting direction?

I didn't realize the Akra was built for the 25. Think there's more there for a ZX4-specific exhaust?

What are some good tuning options for my 21 Ninja 400. Also from what you have seen is it safe for me to run a header without a tune?

So after tune ? It will goes for more top speed, cuz stock bike goes to 237+_ kmh .. i would love to see vid for top speed after tune ..!

Fucking hell, it sounds so good.

Is that a full exhaust or just a slip on? Whatever it is could you reply with the link?

Moto sensacional espero que um dia ela vem para o Brasil porem vai vim com valores surreal equiparados a zx6r e 636

Did you try 13 tooth sprocket if want more torque?

motorzinho bravo ahahaha tem a mesma potencia de motor q a xj 600 na roda e um torque muito constante,o q ajuda na saida e retomadas

Before I watch 12 minutes of bike on dyno do you post numbers if not will not watch thanks tored of seeing one wheel spin and never getting the only thing dyno gives numbers

Why is it restricted? We dont normally have starter classes for motorcycles in this country. Just unrestricted stock would make this a lot more fun! My first 600 only had 65hp and plenty of fun on the road.

Are y’all planning on offering free updates for customers who already purchased the stage 1 tune?

How can i get that tune and exhaust here in Columbia TN? im coming from a R6 non tuned with 108hp.

are you using gp shift on the zx4r

Hello! what a great advantage these types of configurations offer! but I would like to know, what are the disadvantages? Maybe premature engine wear or deterioration? And why do manufacturers limit the engine? Is it to prevent long-term issues like high maintenance and lifespan?

It’s a sexy bike but why all the performance mods…. 😊

Is there anyway to beef up the torque under 2000rpm? Uk rider here…

Sounds like the old Formula 3 cars

what's the difference and why some dynos shows the power at engine and others at the wheel??

does the full system exaust for zx25r just bolt on to the zx4rr with no mods?

So longevity of the engine changing nearly 45% gains?

FULL AKRA IS THE WAY TO GO ADD VELOCITY STACKS AND YOU'RE TALKING 80HP

Looks like with enough tuning, stacks & air filter you can possibly push it above Kawa's peak HP stats...

1st up 2nd -3rd -4th …. Down 🤯🤯🤯

Why was you only use the clutch in 1 st gear? Cool.

hi mr, is that the quickshift original from kawasaki? or already change it?

Dealers want $135000 OTD for this bike. I'll wait for second hand once the squids get bored of it.

How much did all this cost out of curiosity.

the only complaint i have aboot the little ninjahh is it looks the same as the others. should have give it the zx 10 boat race........ tight arses

Did you have to buy a different quick shifter to swap it to gp shift ?

anything for z250 2022 model please

I still don’t get the point of this bike. By the time he does all the cam work, head work, etc etc, you could have just got a 600 and still have more power.

Hood does the transmission work. He’s kicking down to go up and no clutch ?? Did they change things out on the bike.

Is there a video how you guys changed the shifter to gp shift?

I want the Ninja 400 with the 4 Cylinder and don’t care about the tune Which one would that be ?

R7?! What R7?

@9:14 This is safer on the motor than running race gas also! You can't make your track day if you keep tearing motors up and constantly splitting the cases! Now if I win the lottery I'm not saying I wouldn't run one at its peak on the ragged edge but I haven't won 💩 yet so pump gas and a tune will have to do😜 Man I love this little 400 inline 4!

Torque seems to have not changed?

top speed gps with tune?

Pena quê não tá no Brasil ainda pai

We need tuned ECU for Japan!

Vitesse max ?

Fender eliminator coming anytime? But overall, great bike

Are these whp ? How much do you assume the engine outputs with tune and exhaust then ?

Top top top top top top 👊💀show mesmo

Wait, the gear pattern is all down instead of 1 down and 5 up?