Hi Duncan
My 912 is also difficult to start when it is still hot. I assume it is to do
with
the temperature of the carbs. On such occasions I run the fuel pump for
much longer and then when the engine is turning over and won't fire I
progressively open the throttle until it catches, which is usually about 1/3
to 1/2 throttle. Obviously no choke.
Best wishes,
William
----- Original Message -----
From: "Ami McFadyean" <ami@mcfadyean.freeserve.co.uk>
Subject: Re: Europa-List: Rotax starting - 912S
<ami@mcfadyean.freeserve.co.uk>
>
> 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>
> To: <europa-list@matronics.com>
> 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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