Hey everyone, signed up to ask if anyone has ever experienced a Ninja 300 speedo that is about 10%-15% out. Not the usual way where a displayed 100km/h is an actual 90km/h,
i'm talking where a displayed 100km/h is closer to an actual 112km/h. . . Everyone else always seems to be so slow that i finally got to compare it to my brothers ER-6n (he just got his license)
and it seems that when i'm doing 100, he's doing 110 to 115. :eek: Anyone experienced this, and is there any cheap and easy way i can fix it if so?

Damo990

have you checked via gps?

Welcome Damo!

have you checked via gps?

I did a while ago, it was 5km/s out, but the gps fell off in some scrub and i couldn't find it again :( Gonna go out tomorrow and compare my speedo with my cars and my brothers bike and see what the difference is.

A 15t front sprocket will get you to within 1 MPH at around 80 MPH, very close to being perfect as confirmed by GPS.

A 15t front sprocket will get you to within 1 MPH at around 80 MPH, very close to being perfect as confirmed by GPS.

Doesn't that only apply if your speedo OVER estimates your speed? Mine is UNDER estimating it.

Yep. Stock rear tire? What gearing is on it? Unless the actual speedo is broke, the countershaft speed is the only variable. Used or new bike? 15t front and stock rear 42 will get you about as close as you can get.

Doesn't that only apply if your speedo OVER estimates your speed? Mine is UNDER estimating it.

Welcome to our site, Damo !!!

It is possible that the other vehicles are way too optimistic and that your bike is closer to actual speed, as old3 explains above.

Thru gearing he can adjust the speedo. Different tire diameter too, but that should be pretty minor in comparison to sprockets.

Confirming your gearing and then true, actual speed via GPS is the right first steps. Know what you have in reality. The gearing on the bike might explain it easily.

Thru gearing he can adjust the speedo. .......

Isn't the speedo in the 300 taking the input from the front wheel as the 250's?

Countershaft sensor.

Countershaft sensor.

Thanks, Jim !!!

Post has been corrected. :o :o :o

Thanks, Jim !!!

Post has been corrected. :o :o :o

You are welcome MF, it wasn't easy to suspend my usual narcissistic, ego maniacal and conceited prick tendencies long enough to write it, but I somehow managed! :dancecool:

Yep. Stock rear tire? What gearing is on it? Unless the actual speedo is broke, the countershaft speed is the only variable. Used or new bike? 15t front and stock rear 42 will get you about as close as you can get.

I bought the bike second hand with 10000kms on the clock, and as far as i know the only mod it had was a Akrapovic pipe. I replaced the rear tyre with a Pirelli speed demon in Jan (about 5000kms so far) and i'm pretty sure the front is original still, i would've replaced that too but i'm paying off a fine and can't afford it :(

I called my local dealership this morning and they said they can't adjust it, but he's gonna call Kawa and see what they say, might replace the whole speedo.

What gearing is on it, just count the teeth if you can't find the number on it.