Speedometer shows too much - Honda Motorcycles - FireBlades.org
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post #1 of 14 Old 09-11-2012, 4:34 PM Thread Starter
 
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Speedometer shows too much

Hi there!

I bought a 2nd hand FireBlade for about a month ago, and I have noticed that the speedometer is showing way too much. When i am driving about 130 km/h, the speedometer is showing 165 km/h. I have checked the sensor in the side of the front sprocket, but it seems to be intact.

I Have heart about a Speedo Healer, but the needle is very unstable at high speed, and I don't think it will help.

My bike is a '94 Honda CBR 900 RR FireBlade.

Have any of you seen a problem like that before?

Best regards
Rasmus, Denmark.
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post #2 of 14 Old 09-11-2012, 4:41 PM
 
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Re: Speedometer shows too much

The 94 uses a cable to drive the speedo doesn't it? A speedohealer wouldn't help anyway as it's meant to be used on electronic speedos.

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #3 of 14 Old 09-11-2012, 4:42 PM
 
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Re: Speedometer shows too much

Bikes are notorious for having inaccurate speedometers. However, that's quite a bit. An example is if my speedometer reads 75 mph, I'm actually going 68 based on a GPS on the bike. I suspect that someone has changed the sprockets on your bike, which is a common thing. It's easy to count the teeth on the rear sprocket (or look for a number stamped on the sprocket). The front one you'll have to remove the sprocket cover which is held on with bolts.

Anyone can drive a fast bike, few can drive a bike fast!
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post #4 of 14 Old 09-11-2012, 4:44 PM Thread Starter
 
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Re: Speedometer shows too much

I don't know the general specifications from year to year, but my model is fitted with a electronic speedometer WITHOUT cable. As mentioned, there is a sensor in front sprocket cover.
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post #5 of 14 Old 09-11-2012, 4:45 PM Thread Starter
 
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Re: Speedometer shows too much

Ohh, i forgot to mention. I have checked the gearing, and it is 16-42 as standard.
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post #6 of 14 Old 09-11-2012, 4:54 PM
 
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Re: Speedometer shows too much

It could have something to do with the voltage causing interference (EMI) and making the speedo go haywire.

One other thing to check is that your leftside driveshaft bearing is not wiped out. The sensor is a pickup coil like on cars and also contains the voltage regulator, so if you have other funny electrical stuff happening- that could be a place to look as well.

Anyone can drive a fast bike, few can drive a bike fast!
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post #7 of 14 Old 09-23-2012, 7:32 PM
 
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Re: Speedometer shows too much

I had a '97 that was a bit of a basket case. It had a UK mph speedometer (labelled in 10's not 5's) fitted but the UK ownership papers showed "was registered in another country". Anyway, turns out there's a mph/kmh sensor available and you have to get the right one or it will read significantly off. Not knowing what I had, and wanting to change the final gearing anyway, I bought a speedo healer. Fixed it, speedo was then on accurate to within 1% of GPS at all speeds once setup properly.
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post #8 of 14 Old 09-25-2012, 5:36 AM Thread Starter
 
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Re: Speedometer shows too much

@Surteez

The speedometer is not that unstable, just a bit at specific speeds. So I don't think it is the voltage causing interference. I don't have any other electrical problems. But I will check it anyway. Thanks for your advise.
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post #9 of 14 Old 09-25-2012, 5:44 AM Thread Starter
 
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Re: Speedometer shows too much

@amorti

That sounds a lot like my problem. I found out that my bike is imported as well. So maybe it is a MPH sensor and a KMH speedometer?

Can a speedo healer fix my problem? I mean, it is i a huge difference to "heal". And is possible on my FireBlade, where the sensor is measuring on the front sprocket?
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post #10 of 14 Old 09-25-2012, 5:48 AM Thread Starter
 
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Re: Speedometer shows too much

@amorti

I am also planning on keeping my standard gearing. Is it possible with a speedo healer?
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post #11 of 14 Old 09-25-2012, 6:29 AM
 
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Re: Speedometer shows too much

@rasmus,
I think you have the exact problem my bike had but in reverse. The difference was ballpark 25% and the speedo healer had no trouble with it. They can cover a Really big range!

So you either need a kmh sensor to get as good as original, or a speedo healer to get perfect. In any case a brand new bike will over read approx 8% and for me I prefer it to be accurate. So even with original gearing you would have an advantage by getting the healer if you agree with me.

However healers don't come up cheap but used sensors might do.

Your call! But I think the diagnosis is correct anyway.
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post #12 of 14 Old 09-25-2012, 6:52 AM
 
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Re: Speedometer shows too much

IIRC the speedohealer will do + or - 99 %.

If the bike isn't braking properly, you don't start by rebuilding the engine.
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post #13 of 14 Old 09-25-2012, 7:09 PM
 
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Re: Speedometer shows too much

i have a speedo healer on my 929 and it works great. its simple to setup, only takes a cpl seconds to setup.
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post #14 of 14 Old 09-26-2012, 8:12 AM Thread Starter
 
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Re: Speedometer shows too much

Okay. Thank you all.

Sounds like a speedo healer will fix my problem, and if it doesn't, I can use it afterwards anyway.

Best regards
Rasmus, Denmark
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