Speedometer interference?

Alex96 · Sep 26, 2012

I did some cable management on my MB, and routed all the wires from the handlebars down a single tube. This includes kill switch, Headlight +, and speedometer. since doing so, the speedometer still registers speed fine when I walk the bike, but with the engine on, it now shuts down->resets->then comes back on and repeats.

I'm gonna start working on a solution tonight. I think first I'll try shielding the wire with something. Has anyone else had this problem?

-Alex

The_Aleman · Sep 26, 2012

I've seen several members have this problem on the forum, and I had the problem years ago on my first build. What I did to solve it was isolate the speedometer cable from other wires, replaced the plug and plug wire with aftermarket ones, and installed a snap-on plug wire noise supressor. I didn't need the snap-on suppressor on later builds, merely keeping the speedometer wire isolated seemed to do the trick for the most part.

2door · Sep 26, 2012

Here's some reading on the subject:

http://www.google.com/cse?cx=partne...c.tab=0&gsc.q=Speedometer problems&gsc.page=1

Tom

16v4nrbrgr · Sep 26, 2012

I've had this problem with an HT engine with a generic electronic bike computer that looks like it has the same housing as a Trail Tech dirt bike tach. The speedometer would fade to gray and reset, as well as displaying jibber with the engine near top speed. The same speedometer taken off that bike works on an electric bike fine. The CDI and the vibration both affect the electronics.

Alex96 · Sep 26, 2012

Well that was the problem. I separated the wires and the problem went away. In the future I'd like to get an analog one on there, for looks.

dracothered · Sep 26, 2012

Alex96 said:
Well that was the problem. I separated the wires and the problem went away. In the future I'd like to get an analog one on there, for looks.

If you shield the speedo wires you could run them in the same area as the rest.

Wickedest1 · Jan 27, 2013

dracothered said:
If you shield the speedo wires you could run them in the same area as the rest.

I'm an idiot, so could you please tell me what to use to shield the speedo wire? Can I just wrap the wire with tin foil? I dont know what to do here...

dracothered · Jan 27, 2013

Wickedest1 said:
I'm an idiot, so could you please tell me what to use to shield the speedo wire? Can I just wrap the wire with tin foil? I dont know what to do here...

You can buy stuff from one of the electronic sites that you put around or over the wire you want to shield. Do a search for wire shielding wrap. Here is one such company http://www.zippertubing.com/.

biknut · Jan 27, 2013

The easiest thing to try would be a suppressor spark plug. If that doesn't work, there's also suppressor spark plug wires, and caps.

Wickedest1 · Jan 29, 2013

What about expanded metal? I know its used to shield hard drives in servers, wonder if that would work...

dracothered · Jan 29, 2013

Wickedest1 said:
What about expanded metal? I know its used to shield hard drives in servers, wonder if that would work...

What Biknut said would be the easiest to start with and then what I said would be the next step if you have to.

locutus_1 · Feb 2, 2013

Alex96 said:
I did some cable management on my MB, and routed all the wires from the handlebars down a single tube. This includes kill switch, Headlight +, and speedometer. since doing so, the speedometer still registers speed fine when I walk the bike, but with the engine on, it now shuts down->resets->then comes back on and repeats.

I'm gonna start working on a solution tonight. I think first I'll try shielding the wire with something. Has anyone else had this problem?

-Alex

move your spedo cable to the other side .. or use a wirelss.. you can get a wireless spedo from walmart for 20 bucks.. comes with all the features.. temp miles trip speed etc

maniac57 · Feb 3, 2013

My wireless Cateye died recently after several weeks of wonky operation (especially at higher rpm's)

The_Aleman · Feb 3, 2013

BarelyAWake · Feb 3, 2013

May not be the solution you're looking for, but it's solved everythin' for me;
http://motorbicycling.com/showthread.php?t=41494

...at this point, I couldn't imagine anything else save for appearance's sake

Wickedest1 · Feb 3, 2013

BarelyAWake said:
May not be the solution you're looking for, but it's solved everythin' for me;
http://motorbicycling.com/showthread.php?t=41494

...at this point, I couldn't imagine anything else save for appearance's sake

As far as appearances go I love my frankenbike...but ive yet to find something durable enough to withstand the beating my bike gives to everything I attach to it...but I keep my droid handy on a bicycle speedometer app from the play store that is free and quite accurate...until I can get some wire shielding, this is what I'm doing...

tooljunkie · Feb 3, 2013

it looks like the braided ground strap used on some cars.speed shops carry it as wire covering.
i have a roll of it,i use it on antenna wire to shield it from noise.
if you go with something like this,only one end should be connected to ground,not both.

Wickedest1 · Feb 3, 2013

tooljunkie said:
it looks like the braided ground strap used on some cars.speed shops carry it as wire covering.
i have a roll of it,i use it on antenna wire to shield it from noise.
if you go with something like this,only one end should be connected to ground,not both.

I'm actually looking to buy some cloth tape specifically used in aerospace technologies to basically wrap and seal the speedo wire to the fork leg... zpt

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Speedometer interference?

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2door

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