Noisy speedmeter gauge

[xpd153]

Hi RC27/SC21 riders!

 My RC27 gauge got another problem. It generates significant mechanical noise at running.
 When I fixed wrong tacho display problem, I used silicon grease spray for meter cable connection hole.
 But it seems like not enough.

 Currently I am considering following three battle plans.

Plan A
1 dismantle the gauge
2 find source of the noise by rotating speed meter cable receiver. Maybe some kind of self made tool is required.
3 apply grease(or oil)

Plan B
1 dismantle the gauge
2 combine another stock gauge and original odometer part. Because I want to inherit original odometer display.

Plan C
1 Replace original gauge with stock gauge. Give up keeping original odometer display.

 Does anyone have any suggestion? Please !

[robvangulik]

Hi XPD, how many km on that clock now?
At around 180.000km the plastic drive on my odometer (black sc21) was totally worn so it stopped giving distance readings.
I couldn't repair it and replaced the complete gauge on my black bike, taking over the reading on the display from the broken one.
Isn't very difficult to do, just a bit fiddly (some patience, on the kitchen table, with tweezers and a very small screwdriver)

[xpd153]

My RC27 odometer recorded just 42000km.

In many cases, broken odometer is caused by worn odometer gear.
In 1980s, many European cars and motorcycles have Motometer or VDO odometer. Porsche,BMW, Volvo,Ducati and etc. Those odometer gears have well known defect that oil gear soften the gear. and the gear lost teeth.

 My BMW K75S also got such problem. I replaced odometer gears just two weeks ago.

 However, most Japanese cars and motorcycles have Nippon Seiki's odometer.  It seems like Nippon Seiki odometer does not have such problem. And mine is working. Just makes significant noise.


Attached photo is broken BMW K75 Motometer odometer gear.

[robvangulik]

Well, it's not likely to be worn already then, the source of the sound must lie elsewhere.
There aren't many parts in there that can make noise, maybe a small metal part has attached to the magnet driving the needle, touching the bell around it....

[xpd153]

After the last posting, I checked the gauge. But it seemed like that was not source of the noise.
Then I checked front brake hose because I recently replaced it. I tied up the hoses.Still noise remained.
Today, I replaced coolant. After all operation, I turned on the engine. and the noise appeared. The CBR was standing by the center stand. Then I finally found out the source of the noise. It is left side GPZ900R mirror.
Honda genuine CBR mirror is inferior to GPZ900R mirror as early warning system. So my CBR has GPZ mirrors.
 
 Probably I am going to search another GPZ900R mirror because I don't want that noise.

[robvangulik]

Well, that was quite unexpected 
Can't you disassemble the mirror to see what part is vibrating and tighten it, or put a dab of silicone gel on it?

[Golem]

If it's fixed, it should not make noise...

[xpd153]

I fixed by using JB-Weld. Please watch attached photo.

Mirror position of GPZ900R is about 10 cm higher than CBR750 mirror position. It makes big difference.
If you have a problem with CBR mirror then GPZ mirror might be alternative. see attach #2.

[robvangulik]

Well i'm happy for you the mistery is solved, but I must say I don't like the look of those mirrors very much. It looks like a deer with too large antlers to me.
I can't say I ever had trouble using the Honda mirrors, and in general we Europeans tend to be taller than Japanese.
 Exceptions possible of course

[xpd153]

Frankly GPZ mirrors spoils the beauty of CBR. I have to admit it.

But, with CBR mirrors, my arm occupied half of mirror area and hard to keep good rear visibility. I disliked it.
Unfortunately CBR mirror hole pitch is unusual 62mm. Recent mainstream mirror hole pitch is less than 50mm.

At this point, I don't have other alternative mirror candidate for CBR.

 

[robvangulik]

Of course safety is more important than beauty, but with the modern search possibilities of the internet i think there are better alternatives to be found,
I remember a German site who had many different kinds of mirrors www.louis.de and www.davidsilverspares.co.uk also had a nice collection. There must be lots more also closer to Japan!


PS i looked at louis just now, and they sell mirror extensions too!
I don't know if you still have the original mirrors, that would be an easy way to have wider rear view with those!
 And cheap too

[xpd153]

Yes,I have original light grey CBR mirrors.

The problem of modern search capabilty is, it usually generates low quality results.
And CBR750 is rare, like Amur Tiger. It mirror mounting hole pitch is unusual 60mm and mounting bolts are not exchangeable.

I think RC27 and SC21 are compatible regarding mirror.

Did you find SC21 compatible mirror extender?

[robvangulik]

They look quite similar, but the holes on my sc21 are even further apart at 80 mm.
I never felt the need for extending them, i quite like them the way they are, i have a good view of what happens behind me, and when in the dark there is a car with blinding lights coming up i can easily put my elbow out to blank it off
But i think it is easy to make a fitting extender yourself (or myself) in the form of the mirror baseplate, from an aluminium plate in the wanted thickness.
That would (in my eyes) look so much better!
Here is a pic of what I mean....

[xpd153]

This might be one of reasons why I have to buy 3D printer. I think.

[robvangulik]

That could work, don't you know someone who has one?
And how far would you extend your mirrors? Usually just a few centimeters makes a big difference!
You could make a mold out of wood first......