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My speedometer reading became erratic and then went to ZERO. I removed the Speed sensor and turned it manually with a flat blade screwdriver- I got a readout on the instrument panel.



I reinstalled the speed sensor andspun the front wheel (in the forward direction) - No reading. I turned the front wheel in a reverse direction and the speedometer readout is correct.



I believe I need to replace the Speedometer Gear Box Assembly. I looked up the part number and found TWO numbers for this part. I've listed the P/N's below.



QUESTION 1 - What is the difference between these two part numbers?



QUESTION 2 - Any tips on replacing this assembly?



Thanks for any help!



Pat










10


SKU:44800-MG9-013
BOX ASSY., SPEEDOMETER GEAR (Honda Motorcycle Code 2456622)





10

SKU: 44800-ML8-701
BOX ASSY., SPEEDOMETER GEAR (Honda Motorcycle Code 2583003)
 

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I looked up the part and the only one shown for 86 aspy is the 44800-MG9-013 for the whole assembly and 44806-MG9-003 for the gear only.
 

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I may have misled you, I looked up 86 model at first then went back when I realized you have an 84. You are correct, there are 2 different listings. No explanation of why. Knowing Honda parts system there is no difference other than price.
 

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Pat,

I had to replace mine on my '87 Aspencade a while back. There was only one part listed for mine, which was 44800-MG9-013.

Since there are two different ones listed for your '84 I would be tempted to buy this part from the dealer if I were you. I prefer not to buy from the dealer, but rather buy online for better prices. In this case, I would make an exception, just in case you get the wrong one of the two then the dealer would have to make it right and swap out for the other part.

The install is not hard at all. When you get inside of your old one you will likely find that the nylon ring that fits over the wheel hub and drives the input to the gear box assembly is broken in two or more pieces. The only tricky part to reassembly is to make sure that the tab on the gear box is on the correct side of the tab on the wheel hub. If not, the entire gear box assembly will spin when the wheel rotates! So, look closely at those tabs before you remove the old one and see how they are aligned, i.e. which one is in front of the other one.

Good luck.
 

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Pat,

One other important thing to mention was the cause of my drive gear box breaking.

My drive gear broke because the driven shaft inside the speed sensor itself had so much road goop and rust inside it that it would hardly turn at all by hand with a screwdriver! If yours doesn’t turn easily by hand, then you are just on your way to breaking your new drive gear box at some point.

I was actually able to save my speed sensor by spraying a ton of WD-40 into the rotating shaft until it cleaned all of the goop out. (Disassemble the two halves of the speed sensor before you spray it! Only spray the side with the rotating shaft in it. Don’t get any WD-40 on the printed circuit board inside the other half!) After that, the speed sensor internal shaft spun freely, and I did not have to replace it. (Which is good, since it costs about $130.00). I also tried to work a little bit of light grease down inside the side with the rotating shaft before reassembly. This in hopes that the unit would not get plugged up and rusted again like before.
 

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Hey Wingman,

I agree - it's just as important to discover the cause of a problem as it is to fix it.

My speed sensor turns easily - I may just have material fatigue, but I'll know more after I remove the front wheel.



Pat
 

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Can you tell me where the speedo cable routing wire is connected on your bike?

The lower one down by the caliper.
 

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Andy...
The plug end of the speedo sensor is located under the false gas tank on the left side of the frame. Just trace the wire up and you will find it.
 

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andy_christy wrote:
Can you tell me where the speedo cable routing wire is connected on your bike?

The lower one down by the caliper.
Andy,

The "lower one" is connected to the speed sensor module which is secured to the back of the speedometer gear box assembly (at the left-side front wheel hub) with one screw.

Bear in mind that this info is for an Aspencade which uses an electronic speed sensor, not a speedometer cable like the Interstate uses.
 

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Buy the whole assembly, I replaced just the gear on my 1200 once, and a month later the brass worm gear went out, so I had to buy the whole assembly anyway.
 

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Gear Fix 44806-MG9-003

June 2014 -
I just ran into the same issue and the two forks that mate to the hub had been worn away. After cleaning out the packed grease I was happy to find that the worm side of the gear was ok. I looked and found a part number for just the gear! But.... it is now 'obsolete' and you are forced to buy the whole assembly.
LOOKING at the gear it appeared to be a plastic and was quick to melt with a solder iron. Using plastic ABS rod (harbor freight) I worked small bits into these to forks and built the edges back up. MAKING SURE to melt both plastics together (photo 1) Then using a dremel with a sanding drum I reshaped (slowly) the curve to the gear, and finally sanded the top of the forks level on the bench on a piece of sandpaper. (Photo 2- final)
Works fine at this time, the new faces to the forks seem solid and I have confidence this will last for awhile. (I will post later with my long term result) John
 

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