[MissTwisties]

Last season on one of my last rides, my speedo cable fell off and was dragging on the asphalt, lucky for me a friend of mine was following me on his bike and noticed sparks under my bike...now I am paranoid that it may fell again and maybe when I'll be riding alone and won't notice it. Seems that maybe the vibration makes it to unscrew and fell off?

[Honclfibr]

It's a well-known problem with the EX250/EX500 bikes. Happened to my EX500 and pretty much everyone with an EX that I know at one point or another.

I put some threadlocker (Go to a hardware store and ask for some, they'll know what you're talking about and it's cheap) on mine and tightened it down as hard as I could, and it's never fallen off since then.

[MissTwisties]

And I suppose if need to, you can unscrew it after with a tool? Thanks for the info!

[Honclfibr]

Originally posted by MissTwisties
And I suppose if need to, you can unscrew it after with a tool? Thanks for the info!

If you're concerned with being able to unscrew it later, you should ask for "nonpermanent" threadlocker. It doesn't hold as well as the permanent kind, but it can be removed with tools if needed.

[jersey_devil_68]

You could try safety wire as well

[MissTwisties]

Originally posted by jersey_devil_68
You could try safety wire as well

...and what is that? (sorry, I'm a little ignorant about these things...)

[bemused]

Originally posted by MissTwisties
...and what is that? (sorry, I'm a little ignorant about these things...)

aka "lock wire". find / drill a hole in the head of the bolt that's unscrewing itself, pass some thin-but-strong wire thru it, then attach it to some non-moving part... keeps the bolt from being able to move.

easier to show than to explain... any of the racers here (or someone w/ experience fixing aircraft ) could show you how.

[TLRMan]

Just ask for "Loctite Blue" Small bottle...
Clean up both sets of threads...alcohol works good, a couple drops to one set of threads screw it back on, and Forgetaboutit.