'87 Aspy Speedo Problem


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Silver05
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'87 Aspy Speedo Problem

Postby Silver05 » Sun Nov 09, 2014 12:17 pm



I need your help with the speedometer on my wife's 1987 Aspencade.

On a ride yesterday her speedometer went out. I don't know if it was just a coincidence, but we had just gassed up and she reset her trip meter before pulling out of the gas station. Immediately after that she noticed her speed indication on the digital readout was showing 0 MPH.

I have looked at the wiring schematic in the repair manual and see that the speed sensor does have a wire going to the keyboard where the trip reset is located so this could possibly be a related problem.

Looking for suggestions about what the cause of this problem may be? Could the speed sensor have gone out? Is it more likely a speedo cable?

Everything else was still working (tach, fuel gauge, temp gauge, etc.). The only other thing that stopped working was the self-cancelling turn signals. But it kind of makes sense that if the speed signal was lost, the turn signals wouldn't cancel by themselves.

Any help or suggestions on where to look would be greatly appreciated.



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virgilmobile
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Re: '87 Aspy Speedo Problem

Postby virgilmobile » Sun Nov 09, 2014 12:33 pm

You'll need a volt meter.
Locate the plug that the speed sensor sending unit is attached to(on he front wheel).
Centerstand the bike and get the front wheel off the ground.
With the volt meter and key on,one wire is ground,another has around 5 volts on it,the third should switch between zero volts and around 5 volts as the wheel is turned.
This is the speed pulses.If there ok there,your problem is up top.if it does not switch,look at the spedo pulse unit on the axle.
There must be steady volts to the unit to get it to operate.

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Silver05
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Re: '87 Aspy Speedo Problem

Postby Silver05 » Sun Nov 09, 2014 12:57 pm

virgilmobile wrote:You'll need a volt meter.
Locate the plug that the speed sensor sending unit is attached to(on he front wheel).
Centerstand the bike and get the front wheel off the ground.
With the volt meter and key on,one wire is ground,another has around 5 volts on it,the third should switch between zero volts and around 5 volts as the wheel is turned.
This is the speed pulses.If there ok there,your problem is up top.if it does not switch,look at the spedo pulse unit on the axle.
There must be steady volts to the unit to get it to operate.


If I am looking at the repair manual correctly the wires you are talking about are the black/brown and black/yellow ones. Checking voltage across these two should show the fluctuation on the meter as the wheel is turned. Correct?

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virgilmobile
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Re: '87 Aspy Speedo Problem

Postby virgilmobile » Sun Nov 09, 2014 2:28 pm

I don't have a manual near but either way.one is ground,another is steady volts and the third switched high to low as the wheel is turned.

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Silver05
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Re: '87 Aspy Speedo Problem

Postby Silver05 » Sun Nov 09, 2014 2:30 pm

virgilmobile wrote:I don't have a manual near but either way.one is ground,another is steady volts and the third switched high to low as the wheel is turned.


OK, thanks.

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oldishwinger
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Re: '87 Aspy Speedo Problem

Postby oldishwinger » Sun Nov 09, 2014 5:07 pm

Hi, the common culprit is the speedo gearbox spline stripping. on the left side of the front wheel, remove the speedo sensor from the wheel. (its held on by only one screw, and can be pulled away from the wheel easily.) In the small hole, left at the wheel, you will see a small thin flat drive, sticking out.

jack the wheel off the ground, and spin it slowly, you should see that small drive start to spin. If it doesnt move then the spline is toast. the OEM gearbox is still available from Honda.

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Re: '87 Aspy Speedo Problem

Postby Silver05 » Sun Nov 09, 2014 8:52 pm

oldishwinger wrote:Hi, the common culprit is the speedo gearbox spline stripping. on the left side of the front wheel, remove the speedo sensor from the wheel. (its held on by only one screw, and can be pulled away from the wheel easily.) In the small hole, left at the wheel, you will see a small thin flat drive, sticking out.

jack the wheel off the ground, and spin it slowly, you should see that small drive start to spin. If it doesnt move then the spline is toast. the OEM gearbox is still available from Honda.


Yes, thank you. I have a friend in California who is a Goldwing mechanic and he confirmed what you said and suggested the same thing.

I'm taking the Aspy out to my shop tomorrow to have a look. I appreciate the responses from everyone.

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Re: '87 Aspy Speedo Problem

Postby Silver05 » Mon Nov 10, 2014 4:09 pm

I have run into a snag trying to get the front wheel off of the bike. I think it has something to do with the aftermarket chrome rotor covers. The left one seems to be hanging up on a tab that extends out from the left fork leg.

I have removed the right brake caliper, but not the left one yet. I also removed the axle nut. It looks like to me I am going to have to pull out the axle all the way out to get the wheel off. Anyone out there have any experience with chrome brake rotor covers. I could use some pointers.

Thanks in advance.

Oh, BTW, I removed the speed sensor and noticed that the drive spline coming out of the speedometer gear box doesn't turn when I turn the front wheel. So I assume this is the culprit and needs to be replaced?

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Re: '87 Aspy Speedo Problem

Postby oldishwinger » Tue Nov 11, 2014 1:40 pm

if the drive doesn't turn, then yes that's the reason for the speedo not working and will need to be replaced. the spline is not available, but the whole gearbox is from Honda I replaced mine recently too.

I watched a mechanic put mine in, and there is no need to remove the front wheel completely, and no need to remove the callipers.

Jack the wheel up, follow the manual, to take the holders off each side, its very important, they go back on as per manual. remove the axle nut, and drop the wheel to clear the axle, so you can reach the gearbox. there is no need to pull the axle right out, although you may need to push it slightly to the right, to clear the gearbox. the new gearbox also has to go back a certain way check the manual, it has a lug that has to face properly.

grease the spline on the new gearbox too, before installing.

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Re: '87 Aspy Speedo Problem

Postby Silver05 » Wed Nov 12, 2014 3:34 pm

I finally got the front wheel off. Those chrome rotor covers were a bugger to get off. I had to pry with a big flat-blade screwdriver against the fork leg and the chrome rotor cover to get enough clearance to get the rotor cover past the speedo stop tab on the left fork lower.

The plastic gear inside the speedo gearbox is stripped. I ordered the new gearbox and while everything is apart, I am doing a good cleaning and taking off all that aftermarket chrome stuff on the front end. I think the bike looks better without it.

Thanks everyone for your help!

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Re: '87 Aspy Speedo Problem

Postby westy57 » Thu Oct 15, 2015 4:50 pm

Do I ck it on the speedo side after disconnecting plug?

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Silver05
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Re: '87 Aspy Speedo Problem

Postby Silver05 » Thu Oct 15, 2015 5:00 pm

westy57 wrote:Do I ck it on the speedo side after disconnecting plug?

Not sure I understand your question. Please elaborate.

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Re: '87 Aspy Speedo Problem

Postby westy57 » Thu Oct 15, 2015 7:48 pm

I pulled apart disconnect in fairing & check 3 wires coming from the speedo box.I'm not sure why I would read 5 volts coming out of it & spin tire & read voltage also where would.How would voltage get into it?

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Re: '87 Aspy Speedo Problem

Postby westy57 » Thu Oct 15, 2015 7:57 pm

I held one lead to ground ( green/blk) & other to ( blk /Brn) no volts then green/blk to Blk/Yell spin tire no volts
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virgilmobile
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Re: '87 Aspy Speedo Problem

Postby virgilmobile » Fri Oct 16, 2015 8:43 am

The volts are checked with everything hooked up.Leave the spedo plugged in.Key in the on position...Just as if you were driving.Probe the connector to test for the volts.

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Re: '87 Aspy Speedo Problem

Postby westy57 » Fri Oct 16, 2015 12:54 pm

Thank you Virgil it didn't make sense the way I did it.Ended up putting it all back together.The bike was given to me & I accidentally unplugged stator while putting back together & took it a part again.Now I'm scared to even wash it.Just had front tire put by Honda don't know if it had anything to do with it going out




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