[Mindcrime79]

Hi guys,

After changing sprocket sizes the gear indicator is not working and I'm getting a check engine light.

Is there a fix for this?

2021 Ninja 650 ABS

 

[Obo]

Was it the front sprocket you changed or the rear and did you go up or down in size.

I'm thinking the sprocket size may be more than that the ECU can recitfy when comparing the engine speed / associated bike speed to the ABS sensor feeds from the wheels. One is likely providing data that says the 2 speeds don't match up properly. "How can I be in 4th when the bike seems to be in 3rd/5th" kind of thing.

 

[KawasakiBrad]

You may have pinched the gear position sensor wiring or accidentally unplugged it. It's right around your front sprocket area and looks like the pic (stock photo from google, yours has longer wires).

 

[Mindcrime79]

Went down one in front and up one in rear.

Is the bike okay like this? Or is performance retarded ?

 

[KawasakiBrad]

Went down one in front and up one in rear.

Is the bike okay like this? Or is performance retarded ?

Nothing at all wrong with that. In fact -1F and +3R is a VERY common mod in the ZX6 ZX10 world. -1 +1 in your case will be noticeable but nothing crazy.

There is no correlation in the ECU between tach, gear, and road speed. They are all independent functions that have no effect on each other within the ECU.

ABS is based off of wheel speed in relation to each other (front vs rear). In more advanced bikes the IMU and TC comes in to play. On your 650 if it see's one spinning slower than the other while braking it intervenes with ABS. Otherwise the ECU doesn't care how fast (or slow) they're going other than to simply spit out a speedometer reading.

 

[Mindcrime79]

So I can ride it like this but just won't have a gear indicator? How do I get rid of that CEL?

 

[Mindcrime79]

Wiring is all good. Bike performs normal. Guess this is just a nuisance light?

 

[Mindcrime79]

Tremonte seems to think:

If the gear indication sensor and wheel speed sensor detect more than a ~7% difference from stock settings, it thinks something is wrong and blanks the display with the FI light. The only way to correct it is with an ECU recalibration or be creative and build a voltage divider circuit.

 

[GoFaster]

If the gear indication sensor and wheel speed sensor detect more than a ~7% difference from stock settings, it thinks something is wrong and blanks the display with the FI light.

^^ No. That's absolutely incorrect. The ECU doesn't care what gear you're in other than to tell you what gear you're in (on the dash). It has nothing to do with anything else.

Did you pull the codes? What codes is it giving you.

 

[Mindcrime79]

"25," gear position switch.

There seems to be two schools of thought here. Those that think the ECU and the error has nothing to do with the sprocket change and then those that believe it's directly related. Dealers are clueless. Tuners have no idea. And those that seem to think it's simply the gear position switch coincidentally don't have a newer model Ninja 650 to back this fact. 🤷

 

[GoFaster]

"25," gear position switch.

So you think it's not the gear position switch why?

There seems to be two schools of thought here. Those that think the ECU and the error has nothing to do with the sprocket change and then those that believe it's directly related. Dealers are clueless. Tuners have no idea. And those that seem to think it's simply the gear position switch coincidentally don't have a newer model Ninja 650 to back this fact.

Yes, I'm sure you are much smarter than all the dealers and tuners in the world. In fact, why would you take a 2021 back to a dealer to solve an issue that should be under warranty? Oh yeah, that's right, ask strangers on the internet and then argue with them. Makes much more sense.

Replace or investigate a small sensor? You know, the one that directly causes all your issues AND the codes specifically tell you is the issue? NAH, let's "recalibrate the ECU" or something. Because people never do sprocket changes. You're the FIRST ONE EVER! And apparently as soon as you change the gear ratio (which thousands of riders do every day) you need a new ECU! That makes tons of sense.

Why don't you keep posting the same question again and again and again on different forums until someone gives you an answer you want to hear. Keep ignoring the logical answers. Must be nice to know more than the ECU, Dealers, and Tuners.

Welcome to the ignore list.

 

[Mindcrime79]

Get over yourself please. You ride a 650 for God's sake. Knock it off.

 

[Mindcrime79]

Who's arguing with strangers? Let make a friendly bet that it's NOT the sensor and I'll ignore your sarcasm.

Do you have a 2021 model that you changed the sprockets on? Answer: NO

Since you have all the answers, please calculate the chances for me of a sensor going bad as soon as a sprocket is changed.

Why would a dealer cover something under warranty when clearly I've explained it's been altered. If you think dealers employee the highest level of knowledge for Kawasaki engineering you've already provided your level of intelligence to me.

That's for your patience and unnecessary sarcasm.

 

[Ozninjaguy]

@Mindcrime. I've read on some other forums that this error code appears when sprockets are changed on some Kawasaki bikes with ABS. The ABS sensors detect different wheel speeds compared to engine speed. "To detect wheel lock up the ABS part of the ECU must compare wheel speed with bike speed (via the bike speed sensor) and the system becomes confused when it's parameters of what is "normal" are exceeded.'

Unless you have diagnostic software/hardware, you will have to take it to the dealer to reset your ECU.

 

[Mindcrime79]

So you think it's not the gear position switch why?


Yes, I'm sure you are much smarter than all the dealers and tuners in the world. In fact, why would you take a 2021 back to a dealer to solve an issue that should be under warranty? Oh yeah, that's right, ask strangers on the internet and then argue with them. Makes much more sense.

Replace or investigate a small sensor? You know, the one that directly causes all your issues AND the codes specifically tell you is the issue? NAH, let's "recalibrate the ECU" or something. Because people never do sprocket changes. You're the FIRST ONE EVER! And apparently as soon as you change the gear ratio (which thousands of riders do every day) you need a new ECU! That makes tons of sense.

Why don't you keep posting the same question again and again and again on different forums until someone gives you an answer you want to hear. Keep ignoring the logical answers. Must be nice to know more than the ECU, Dealers, and Tuners.

Welcome to the ignore list.

I wish gofaster would get off his millennial high horse and become an educated part of america.

Anyway it wasn't the gear position switch as he indicated with his poor grammar and low level reasoning skills.

Everyone else seems to be on the right track so thank you.

 

[xorbe]

You need to short the clutch lever position sensor plug at the handlebars. Otherwise you get CELs / no gear position indicator after swapping to non stock sprockets. I had to do the same thing. Same hack works for ('17-19) N650 and N400. Not sure about latest gen N650 you'd just have to try. The gearing CEL will clear itself after some number of restarts.

Changing sprockets does NOT affect the relative wheel speeds front and back wrt the ABS ring sensors. That happens when you use odd tire sizes.

 

[qalus38]

You need to short the clutch lever position sensor plug at the handlebars. Otherwise you get CELs / no gear position indicator after swapping to non stock sprockets. I had to do the same thing. Same hack works for ('17-19) N650 and N400. Not sure about latest gen N650 you'd just have to try. The gearing CEL will clear itself after some number of restarts. Changing sprockets does NOT affect the relative wheel speeds front and back wrt the ABS ring sensors. That happens when you use odd tire sizes.

I'm having CEL issue now code 25, can you share some photo how to short the clutch level position sensor? much appreciated