How is it that the higher power starter motor does not put a higher load on
the sprag clutch, which would lead to the earlier demise of the clutch? This
assumes that the clutch is the victim rather than the cause, which seems to
be the case.Or is it that the violent starting (and the 'standard' but less
violent stopping) is the sole cause?
Many of the other factors that Rotax list as "remedies" would seem to be
appropriate in the first instance and there must be a compromise somewhere
between spinning the motor fast enough to generate a good spark etc and
spinning it excessively fast.
By the way, I'm having ENORMOUS problems with hot starting at the moment,
which doesn't seem to be related to any of the related issues discussed at
length on this and parallel forums. Hope its not another symptom of the
clutch problem (there's no banging and shaking, just no firing at all). Any
ideas out there?
Duncan McF.
----- Original Message -----
From: "P.A.D.Clarke" <paddyclarke@lineone.net>
Subject: Re: Europa-List: Rotax starting - 912S
<paddyclarke@lineone.net>
>
> Hi Folks,
> A bit more on the sprag clutch. It seems to be a problem
> particularly on the higher compression 912S, but I know of one higher hour
> 912 that's affected, so presumably all Rotax engines may eventually be
> vulnerable. The symptoms have been well described in previous messages,
but
> can be positively diagnosed as the sprag clutch using a clamp meter. Rotax
> SB-912-042 refers.
> A clamp meter can be bought ( in the U.K.) for approx. 90
> pounds from Maplin, tho' I think this could well be a candidate for a tool
> for the club to own and hire out. Note that it has to be able to measure
> DC current.
> The other thing that is worth checking is the friction
> torque in the gearbox - again SB-912-042 refers.
> As David says, Adrian Lloyd at Shobdon did the fix for
me,
> and, as I have an XS with the greater clearance behind the engine, he
> managed to do it with the engine in place. Whether this will be possible
on
> the classic I don't know. Adrian also fitted the high power starter motor
> ( amazing difference - amazing price! ) as he is convinced it will help to
> stop the problem reoccurring. Again, I have heard that this may not be
> possible on the classic due to the restricted space.
> It seems that once the problem starts it will only get
> worse, and as the symptoms are so unpleasant, causing great concern as to
> what is being done to the engine mounts, crankcase, prop, etc., delaying a
> fix would appear unwise. I can't recommend Adrian highly enough.
> Cheers, Paddy Clarke
> ----- Original Message -----
> From: <RMRRick@aol.com>
> To: <europa-list@matronics.com>
> Subject: Re: Europa-List: Rotax starting - 912S
>
>
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