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Discussion Starter · #1 ·
Hi,

I picked up a 1982 CM450E last week and have been busy getting it cleaned up and road ready. One barrier is a very busted speedometer.

Looking for a matching pair, coil driven analog tach and cable driven analog speedo that will just work, MPH, not GPS. Not afraid of rewiring to move the status lights around. Not afraid of making my own mounts.

I figured this should be easy, I know it's a 7:1 2240:60mph, I'd just go to ebay and pick up a new pair. Well, ebay is infuriating. Everything fits everything, no one lists ratios and most are KPH (looking for MPH). I'd prefer around 3" but not much there, I can compromise there for something a little smaller or larger.

Anyone have anything, or can link what will work? Thanks!
 

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Discussion Starter · #2 ·
After more research... looks like I can use most any cable driven speedometer, except for a Harley 2:1. But for a signal driven Tach, I need a 2:1 which are only made for Harley's. The only 2.5"/65mm tach for dual fire I can find, is limited to 8K RPM (hmm sounds like an American V-Twin). Hard to find a matching pair given those parameters. All the other Harley tachs are ginormous.

The big problem with most Tachs is the waste spark doubles the RPM reading. Oddly enough, the only converter is from single fire to dual fire, and not the other way around. I guess metric v-twin owners really need to mount Harley style tachs, but we Honda inline dual-fire twin owners are nothing to the marketplace.
 

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Discussion Starter · #3 ·
In the end I solved the problem by taking apart the stock speedometer, and bending away an internal color that was interfering with the metal doughnut thing attached to the back of the needle shaft (sorry if using vague terminology.) The problem, of course, started with the P.O. crashing the bike. I also beat out a dent in the chrome ring gauge holder, which allowed the gauge to sit square at the bottom of the cup. Finally I put some cut inner tube rings around it to keep it from vibrating.
 

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Man, good job starting and finishing tour own thread. I would have given up on posting in the forum. I have opened up a few speedometers and tachometers for my Nighthawk 450. They usually start making a buzzing dound and then the needle starts flying around like crazy. It is a scary thing to take apart especially when you are just using screw drivers.

Good job fixing the problem. Getting something to match that works for your bike is always an issue. I had contemplated getting a converter for the speedo and tach and moving to an all in one speedometer and tach like on modern bikes.

Like you, I ended up finding or fixing something that worked.

one thing that kept happening to me was I kept snapping speedo or tach cables. I had a mechanic explain to me that I should only put this light powder on the inner metal. After replacing 2 or 3, I grabbed a speedo cable and took out the entire inside metal, greased it with a high performance grease, and put it in the sleeve. Never had to replace another cable.
 
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