Mechanical Tach Bounce
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Mechanical Tach Bounce

  1. #1
    79 Sanger Picklefork Tittyman's Avatar
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    Default Mechanical Tach Bounce

    I have a vertex mag with mechanical tach, and at higher rpm I get a big tach needle bounce..Doesn't matter if I'm in rough or smooth water. It's fine at idle and lower rpm..What causes that issue..thanks..
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    Senior Member EVILFORCE's Avatar
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    Most the time it is the cable. You might try taking it apart and clean and lube.

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    79 Sanger Picklefork Tittyman's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    Most the time it is the cable. You might try taking it apart and clean and lube.
    You mean pull the center drive wire completly out of the cable clean and lube the solid wire and reinstall..also lube with just bearing grease? thanks for the reply..
    Last edited by Tittyman; 01-28-2013 at 12:36 PM.
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    gn7
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    Quote Originally Posted by Tittyman View Post
    You mean pull the center drive wire completly out of the cable clean and lube the solid wire and reinstall..also lube with just bearing grease? thanks for the reply..
    Never seen one that you could slide the cable out. The drive pieces on the ends are larger than the ID of the jacketing.
    No, you don't grease it. There is an actual cable lube but its not sittting on shelves everywhere. The next best thing to use is a chain lube. You need to take it out and get it stretched out vertically and allow the lube to run into the jacket.
    It MIGHT work, but you may just need a new cable. Any speedo shop can make you one.

    Also, the tack itself could be the problem, but that usually shows up at low RPM.



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    Distinguished Member David 519's Avatar
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    I haven't looked at a gear drive tach cable in a bit, but I know Motion Pro makes a cable luber that clamps on one end and allows you to douch all the crap out of motorcycle throttle/clutch cables. After that, a light lubricant like LPS will keep it free. We use it on our dirt bikes all the time. They're cheap so even if you have to modify it to work on a tach cable, you wouldn't be out much. I probably wouldn't suggest a modern chain lube as it congeals like wax in order to stay on the chain. Vince (stix818) uses chain lube on his props and says it stays on after a pass. I haven't tried it, but gonna.
    Quote Originally Posted by gn7 View Post
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    gn7
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    Quote Originally Posted by David 519 View Post
    I haven't looked at a gear drive tach cable in a bit, but I know Motion Pro makes a cable luber that clamps on one end and allows you to douch all the crap out of motorcycle throttle/clutch cables. After that, a light lubricant like LPS will keep it free. We use it on our dirt bikes all the time. They're cheap so even if you have to modify it to work on a tach cable, you wouldn't be out much. I probably wouldn't suggest a modern chain lube as it congeals like wax in order to stay on the chain. Vince (stix818) uses chain lube on his props and says it stays on after a pass. I haven't tried it, but gonna.




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    Buy a new Cable ....duh

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    gn7
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    Quote Originally Posted by mdsheppie View Post
    Buy a new Cable ....duh
    If the cable is bad, you don't even have to buy a new one. You just take it to a speedo shop and they can replace the inner cable.



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    Distinguished Member David 519's Avatar
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    Quote Originally Posted by gn7 View Post
    Yup, that's it. The little holes are the same size as the plastic tubes on aresol cans like brake clean/contact cleaner. For a lube I used a BelRay product that was an all purpose lubricant.
    Quote Originally Posted by gn7 View Post
    ....... David 519 is 100% correct........

    Quote Originally Posted by fuelinmyveins82 View Post
    .....I think people forget that racing is supposed to fun. Losing shouldn't be discouraging it should motivate you work on your pile to make it faster.....

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    My cable wasn't tightened right at the speedo
    It may be OLD ,it may be Slow ... but at least it's MOBILE !!!

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