I would look seriously at the possibility that you have air leaking into
the carburettor bowl. This now seems to be a fairly common issue with
older 914s that still have the old paper gaskets. Typically folk spend
months and a small fortune trying to work out what is happening before
replacing the gaskets with the new Rotax rubber ones and 'living happily
ever after!' Tends to produce very rough running at 3500+ rpm and
reluctance to produce any greater revs - very disturbing if taking off
---From a short runway! Look out the article in Europa Flyer a year or two
ago by Jim Butcher (assuming you are in the club it is available and
searchable on the website). David Joyce, GXSDJ
On 2021-09-14 22:53, Mallard wrote:
>
> Has anyone had the experience of balancing the carbs on a Rotax 912
> type engine and after a couple of hours of smooth running across all
> revs you suddenly get rough running at 3500 rpm.
>
> If you experienced a similar situation, how did you deal with it?
>
> I'd also be interested to hear from any 914 owners on the forum who
> have had the above 'Carb Balancing' problems & what was done to keep
> the Carbs Balanced?
>
> Thanks for any contributions.
> James
>
> --------
> Seat of my pants
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=503143#503143
>
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