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 Post subject: Speedometer Question
PostPosted: Wed Sep 06, 2017 7:30 pm 
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Joined: Wed Jul 12, 2017 3:34 pm
Posts: 65
Location: Virginia
The speedometer on my 85 RZ500 will go up to about 55-60mph and stop. The cable turns freely can't see anything out of the ordinary.. The needle just won't go any higher.

Any ideas?? Thanks.


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 Post subject: Re: Speedometer Question
PostPosted: Thu Sep 07, 2017 4:27 am 
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Joined: Tue Jul 19, 2011 7:49 pm
Posts: 176
Location: Toulouse France
You should check the drive in the wheel


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 Post subject: Re: Speedometer Question
PostPosted: Mon Sep 11, 2017 6:25 pm 
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Joined: Wed Jul 12, 2017 3:34 pm
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Location: Virginia
Phil, I replaced the speedo drive and still only 60mph??? It's not that complicated of a system...


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 Post subject: Re: Speedometer Question
PostPosted: Mon Sep 11, 2017 7:43 pm 
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Joined: Mon Sep 14, 2015 12:30 pm
Posts: 506
Location: Bay Area. CA.
thumper580 wrote:
Phil, I replaced the speedo drive and still only 60mph??? It's not that complicated of a system...



Try a different Gauge then, It must be that,
Did you pull the drive cable out of the speedo cable, These sometimes snap in the middle and can snag and drive the speedo a little.


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 Post subject: Re: Speedometer Question
PostPosted: Mon Sep 11, 2017 10:56 pm 
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Joined: Wed Jul 12, 2017 3:34 pm
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Location: Virginia
Tacky...I'll check the cable, but I'm pretty sure it is still in one piece. Another gauge set will be a little pricey...


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 Post subject: Re: Speedometer Question
PostPosted: Mon Sep 11, 2017 11:13 pm 
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Location: Bay Area. CA.
You dont need the set, just the speedo, Even to borrow a speedo, Any speedo will do as long as its mechanical, It doesn't have to be a Yamaha or for a 16" wheel. Its just to test that it goes over 60mph


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 Post subject: Re: Speedometer Question
PostPosted: Tue Sep 12, 2017 12:31 pm 
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Location: Virginia
tacky1 wrote:
You dont need the set, just the speedo, Even to borrow a speedo, Any speedo will do as long as its mechanical, It doesn't have to be a Yamaha or for a 16" wheel. Its just to test that it goes over 60mph


Thanks again... do you happen to know if the rz/rd350 speedo will work?


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 Post subject: Re: Speedometer Question
PostPosted: Tue Sep 12, 2017 8:49 pm 
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Location: Bay Area. CA.
They will work, but im not sure if the speed will read the same, I know the FZ600 works also, But the faces and needles are different as well, The RZ has a 16 wheel with a large, high wall tire, So it might read the same as the 18" wheel on the RZ350 F2 mode.

Maybe someone can chime in on this to be accurate, I have used FZ600 clocks and RZ350 F2 clocks for parts, But I used the RZ500 innards with them..


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 Post subject: Re: Speedometer Question
PostPosted: Wed Sep 13, 2017 1:00 pm 
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Location: Niagara, Ontario,Canada
The ratio in all those clocks are all the same. And I believe all Japanese makes use the same ratio
So they will all work.
Its the speedo drive that has to match the wheel size.

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 Post subject: Re: Speedometer Question
PostPosted: Wed Sep 13, 2017 3:26 pm 
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The RZ350/TZR250 speedo uses a different scale than the 500 speedo. If you look at where the numbers are on the face you'll see they don't line up. The higher you go, the more the offset.


Attachments:
RZ500 Clocks 2 27 June 2016 001.JPG
RZ500 Clocks 2 27 June 2016 001.JPG [ 233.28 KiB | Viewed 415 times ]
RZ350 Clocks 001.JPG
RZ350 Clocks 001.JPG [ 220.99 KiB | Viewed 415 times ]

_________________
1985 RZ500
1985 RZ500 Project Bike
1986 RG500 ATR
1986 NS400R
1987 TZR250
1988 Honda RC31
2007 DL650 VStrom
2014 Triumph Thruxton Modified
1979 Pontiac Trans Am with modified 1969 Olds 455 (7.5 L) 400++ HP, 500++ Ft/Lbs
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 Post subject: Re: Speedometer Question
PostPosted: Wed Sep 13, 2017 3:53 pm 
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Joined: Tue Jul 19, 2011 7:49 pm
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Location: Toulouse France
Well, it should be just a test and try with another speedo if you have one.
Accuracy of the speed indication is not required, it's just to check if speed indication stops near 60mph ~ 100 km/h.
In 6th gear, speed is near 20-22km/h / 1000 rpm.
If speed indication goes linearly with rpm with no stop, your speedometer is out of service and you'll have to find a replacement one.
If still not, default is pretty sure in the drive mechanism.


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 Post subject: Re: Speedometer Question
PostPosted: Wed Sep 13, 2017 7:13 pm 
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Joined: Sat Nov 12, 2011 10:50 pm
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Location: Adelaide, South Australia
Hi get a drill and attach to the bottom of the speedo cable put into reverse should be to
see if it 's working properly.
Cheers Ron.


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 Post subject: Re: Speedometer Question
PostPosted: Thu Sep 14, 2017 12:32 am 
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It's difficult to get enough speed to make 60 MPH with an electric drill. 50 MPH seems to be the max I can get to here when testing. If you have a dremel tool that will run in reverse you may have more luck. I tried a pneumatic drill last week and it wasn't as good as I'd hoped.

I've found all sorts of insect life inside speedos. Try blowing some compressed air inside the cable receptacle. You can also use a few drop of WD-40, but make sure you don't get it above the dial face. I fixed a sticky RZ500 speedo that way last week.


Attachments:
Speedo Gearing 001.JPG
Speedo Gearing 001.JPG [ 156.3 KiB | Viewed 333 times ]

_________________
1985 RZ500
1985 RZ500 Project Bike
1986 RG500 ATR
1986 NS400R
1987 TZR250
1988 Honda RC31
2007 DL650 VStrom
2014 Triumph Thruxton Modified
1979 Pontiac Trans Am with modified 1969 Olds 455 (7.5 L) 400++ HP, 500++ Ft/Lbs
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 Post subject: Re: Speedometer Question
PostPosted: Thu Sep 14, 2017 10:43 am 
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Joined: Wed Apr 20, 2011 3:18 am
Posts: 612
Location: Niagara, Ontario,Canada
I believe all Japan made cable driven speedometers are calibrated to show 60 mph at 2240 revolutions of the speedo cable.
So those 2 different faces would have different calibrations inside?

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 Post subject: Re: Speedometer Question
PostPosted: Thu Sep 14, 2017 9:11 pm 
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2smoke wrote:
I believe all Japan made cable driven speedometers are calibrated to show 60 mph at 2240 revolutions of the speedo cable.
So those 2 different faces would have different calibrations inside?


That is my understanding.

_________________
1985 RZ500
1985 RZ500 Project Bike
1986 RG500 ATR
1986 NS400R
1987 TZR250
1988 Honda RC31
2007 DL650 VStrom
2014 Triumph Thruxton Modified
1979 Pontiac Trans Am with modified 1969 Olds 455 (7.5 L) 400++ HP, 500++ Ft/Lbs


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