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Re: [Spridgets] Rotor quality problems

To: Spridgets <spridgets@autox.team.net>
Subject: Re: [Spridgets] Rotor quality problems
From: "Brent Wolf" <wolf.brent@gmail.com>
Date: Thu, 27 Sep 2007 08:41:05 -0400
Update - Replaced the rotor and all is well.  After closer examination and a
strong light, there appears to be a crack that is visible on the inside. I
don't know who the manufacturer was, but the rotor has Lucas written on the

Back up and Cruising

On 9/27/07, Guy R Day <grday@btinternet.com> wrote:
> Try - and only try - finding fault with the dizzy cap.  The central
> contact
> may have a worn carbon brush causing arcing between cap and rotor instead
> of
> a proper contact.  The spring may be worn.  It might just need a clean and
> when replacing the rotor you give enough of a clean to solve the problem.
> Have a look at the metal contacts on the inside of the dizzy cap, is there
> a
> grey coloured surface on the metal?  If so, get a small screwdriver /
> blade
> and scrape the contacts clean.  The amount of build up there can be
> amazing
> at times.
> I am in full agreement with Tim as to his reasoning.  They should / do not
> go wrong.  I clean the edge of the rotor against a tyre sidewall (say once
> every 5-6 years!), rarely does the middle need cleaning and a single twist
> of wire wool does that.  If it is an old one they can wear a hole through
> the metal to the plastic underneath.
> Yes there can be problems with rotors, cracks allowing an electrical short
> to the drive spindle, arcing across the plastic etc but it is not a common
> failure.  To have more than a couple of failures in a lifetime does seem
> odd.
> Is there wear in the central drive spindle bearings?  Is that moving about
> and creating problems?
> One of the more amusing but helpful things to do is the run the engine in
> complete (and I stress complete) darkness.  You'll soon see where your
> electrical problems stem from.  It might be instructive to do that first!!
> ----- Original Message -----
> From: "Timothy H. Collins" <thcollin@mtu.edu>
> To: <spridgets@autox.team.net>
> Sent: Wednesday, September 26, 2007 12:00 PM
> Subject: [Spridgets] Rotor quality problems
> >I don't understand why you guys experience "out-of-the-box" rotor
> > failures. Just how do they fail? A rotor is a small lump of plastic
> > with a bit of metal. I understand a part built incorrectly, or wear
> > after some number of thousands of miles, but how do they fail OOTBox?
> > The electricity "should" follow the path of least resistance which
> > should be through the metal parts rather than through the plastic.
> > Are you really saying that they are built with poor tolerances? That
> > seems odd too as if one is out of tolerance then every one of them
> > should be OOTolerance. It's such a simple part. What's the failure
> > mechanism?
> >
> > Tim Collins
> > 1966 AH Sprite
> _______________________________________________
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