2003 CB919 speedo off? - Wrist Twisters
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post #1 of 16 Old 09-05-2016, 01:41 PM Thread Starter
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Thumbs down 2003 CB919 speedo off?

Hey guys. Third bike here, this is my first time getting one of these CB919's. I like it a lot, except that the speedo is off by wayyy too much. I ran my phone using GPS vs the speedo on the bike and its around 10% off. The bike reads high. I counted the teeth on the sprockets and its 16 front and 43 rear. I read that is stock. I checked the tire sizes, they are stock. Why the hell is the speedo off by so much? Really annoys me. I like everything to be perfect. Thanks.

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post #2 of 16 Old 09-05-2016, 02:03 PM Thread Starter
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Well i just read that these bikes do that. But the odometer is right then? Thats really messed up. Honda shouldnt do that, sounds like a law suit. Surprised there wasnt one yet. Id like to know what speed im going instead of having to guess the speed in my head. And since i have a few people's attention, there is a plug under my seat that is not connected to anything. Just wondering what should be there.

On another side note the bike came with a corbin seat.. Id honestly rather have a stock seat. Anyone want to trade and throw in like 150$? Thing is 450$ new.

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post #3 of 16 Old 09-05-2016, 02:53 PM
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For a much more accurate speedo, switch to 17/44. Won't affect the odo much.
ewmin3m likes this.

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post #4 of 16 Old 09-05-2016, 07:46 PM
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The plug under the seat not connected to anything is probably the diagnostic port. You put a jumper in it for diagnosing Fuel Injection error codes.

+1 on what PV said. 17/44 sprockets will make the speedo more accurate and much less buzzy at highway speeds. Also much cheaper than a lawsuit.

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post #5 of 16 Old 09-06-2016, 07:43 AM Thread Starter
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Lol alright. Thanks guys. Makes sense about the diagnostic port. Its only a 2 prong plug though. I have a pic of it here.

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post #6 of 16 Old 09-06-2016, 10:37 AM
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Here's a pic from the Service Manual
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post #7 of 16 Old 09-13-2016, 06:29 AM
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What kinda shape is the corbin seat in?

Sent from my SM-N920P using Tapatalk

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post #8 of 16 Old 09-13-2016, 12:36 PM
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Quote:
Originally Posted by Pyromechanic View Post
Well i just read that these bikes do that. But the odometer is right then? Thats really messed up. Honda shouldnt do that, sounds like a law suit. Surprised there wasnt one yet.

All Japanese bikes have optimistic speedo's - if the speedo is reading higher than you are actually traveling then you are not going to get a ticket for speeding when you are doing the suggested speed limit according to the Speedo.

The odometer on the other hand is a touchy subject with a lot of different areas of the law and falsely reporting or altering the accuracy of the odometer can be construed as fraud and highly illegal in most cases which is why it remains accurate regardless of the inherent speedometer error.

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post #9 of 16 Old 08-01-2018, 06:40 PM
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Quote:
Originally Posted by 26010 View Post
Hey guys. Third bike here, this is my first time getting one of these CB919's. I like it a lot, except that the speedo is off by wayyy too much. I ran my phone using GPS vs the speedo on the bike and its around 10% off. The bike reads high. I counted the teeth on the sprockets and its 16 front and 43 rear. I read that is stock. I checked the tire sizes, they are stock. Why the hell is the speedo off by so much? Really annoys me. I like everything to be perfect. Thanks.
Comparing my speed with the others on a road trip has revealed my 919 speedo is reading 80km/h while the others are reading 90km/h.

From the suggestions in this thread, I’ll check sprockets and tyres

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post #10 of 16 Old 08-01-2018, 07:31 PM
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Quote:
Originally Posted by Peter_919 View Post
Quote:
Originally Posted by 26010 View Post
Hey guys. Third bike here, this is my first time getting one of these CB919's. I like it a lot, except that the speedo is off by wayyy too much. I ran my phone using GPS vs the speedo on the bike and its around 10% off. The bike reads high. I counted the teeth on the sprockets and its 16 front and 43 rear. I read that is stock. I checked the tire sizes, they are stock. Why the hell is the speedo off by so much? Really annoys me. I like everything to be perfect. Thanks.
Comparing my speed with the others on a road trip has revealed my 919 speedo is reading 80km/h while the others are reading 90km/h.

From the suggestions in this thread, I’ll check sprockets and tyres
A friend of mine used a speedo healer on his m109r and said it worked great. I just looked it up and they do list one for the 919.

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post #11 of 16 Old 08-02-2018, 10:48 AM
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Originally Posted by Quadiak View Post
A friend of mine used a speedo healer on his m109r and said it worked great. I just looked it up and they do list one for the 919.
I have a Speedo Healer on my 919 and it works perfectly.
Too bad there isn't a Tacho Healer!

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post #12 of 16 Old 08-02-2018, 08:52 PM
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Quote:
Originally Posted by mcromo44 View Post
I have a Speedo Healer on my 919 and it works perfectly.
Too bad there isn't a Tacho Healer!
tacho healer? what is that?

also, the 17/44 kit doesn't correct the speedo nearly as much as I thought it would. instead of being 10% off, its like, 7-8% off. I mean, it's only a small gearing change

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post #13 of 16 Old 08-03-2018, 08:05 AM
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Originally Posted by nathanktm View Post
tacho healer? what is that?
It doesn't exist.
I wish one did.

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post #14 of 16 Old 08-07-2018, 05:37 PM
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These Healtech Speedo Healer Version 4 Kit https://www.ebay.com.au/i/302417302508?chn=ps


Claims to fix the tacho as well as the speedo, is that possible?

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post #15 of 16 Old 08-07-2018, 07:39 PM
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Quote:
Originally Posted by Diablo View Post
These Healtech Speedo Healer Version 4 Kit https://www.ebay.com.au/i/302417302508?chn=ps


Claims to fix the tacho as well as the speedo, is that possible?
I've had a V4 version on my bike for many years.
It works by doctoring the output of the gearbox mounted Speed Sensor.
It had no facility for correcting tacho error.
It sure did a nice job of correcting my speedo error, and the "highest speed save" feature is nice to have for track days - or if you let someone try your bike under certain, ahem, "guidelines".

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post #16 of 16 Old 08-07-2018, 08:08 PM
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So false advertising, who would have thought.

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