Today's Message Index:
----------------------
1. 02:22 AM - Re: Re: 912UL Will not start on UL91 (Clive Richards)
2. 06:58 AM - Re: Rotax 912ULS Stumble below 4000 RPM on final ONLY** (Catz631@aol.com)
3. 07:27 AM - Re: Rotax 912ULS Stumble below 4000 RPM on final ONLY** (SIDESLIP)
4. 07:28 AM - Re: Rotax 912ULS Stumble below 4000 RPM on final ONLY** (pjeffers)
5. 09:00 AM - Trouble starting a 912 ULS (John Elling)
6. 10:08 AM - Trouble starting a 912 ULS (John Elling)
7. 10:56 AM - 914 Alternator Options (N6ZY)
8. 11:09 AM - Re: 914 Alternator Options (Gilles Thesee)
9. 01:44 PM - Re: 914 Alternator Options (Jan de Jong)
10. 02:43 PM - Re: Trouble starting a 912 ULS (Bob Harrison)
Message 1
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| Subject: | Re: 912UL Will not start on UL91 |
Thanks Roger
I passed the information on. The owner
arranged for a Rotax maintenance engineer to come to the airfield & he found
the starter sprag clutch causing the starting problems and that the soft
start had not been connected. No explanation was found as to why it ran
rough on the UL91 but runs fine on 100LL & UL91 now so will run on the UL91
to protect the engine from the lead.
Clive
----- Original Message -----
From: "Roger Lee" <ssadiver1@yahoo.com>
Sent: Saturday, July 13, 2013 5:37 AM
Subject: RotaxEngines-List: Re: 912UL Will not start on UL91
>
> Hi Clive,
>
> The temps should have not made any difference between the two fuels.
> Something else is going on. I would pull the carb tops off and check the
> needle positions. The clips should be in the #3 slot. Third slot down from
> the top. If it is in the #2 position it could cause rough running
> depending on elevation or altitude. It would be a little lean. Those OAT's
> aren't an issue. That's 70F to 84F. While your checking the carbs double
> check the bowls and make sure it has had a carb sync. Make sure the plug
> gaps are at .023 - .027.
>
> --------
> Roger Lee
> Tucson, Az.
> Light Sport Repairman - Maintenance Rated
> Rotax Repair Center - Heavy Maint. Rated
> Home 520-574-1080 TRY HOME FIRST
> Cell 520-349-7056
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=404585#404585
>
>
>
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| Subject: | Re: Rotax 912ULS Stumble below 4000 RPM on final ONLY** |
Chad,
Sounds to me like you have one of your throttle cables hanging up. By
that I mean the internal cable on the outer shroud. I had this happen on my
Kitfox during approach throttle reduction. Lubing the cables helped for awhile
but then I finally replaced them and that solved my problem.
Dick Maddux
912UL
Message 3
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| Subject: | Re: Rotax 912ULS Stumble below 4000 RPM on final ONLY** |
Dick,
Thanks for the reply. Makes sense but at the same time doesn't ? It doesn't do
it on the ground. Maybe because I'm not going from very high throttle down to
4000 on the ground? Good point though, I'll have to check.
Chad
--------
C-GYXQ. 912ULS. 601XL-B
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=405811#405811
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| Subject: | Rotax 912ULS Stumble below 4000 RPM on final ONLY** |
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Message 5
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| Subject: | Trouble starting a 912 ULS |
Folks,
I've gradually had trouble starting a ULS with the 912 Rotax high torque
starter. First it did not like starting when it was cold. Then the
sprag seemed to come disengaged without turning the engine over enough
to start. Finally I started getting a gear-grinding noise. Then
eventually the gears never engaged; just a grinding noise.
I checked the starter alignment between the two ears for the bolts.
Perhaps a 0.010" difference between the gaps of the two ears and no way
to adjust that I could see since the ears of the starter flange are
threaded as are the bolt holes on the engine.
I removed the Rotax starter and found the gear surface was a little
rough as was the mating gear teeth inside the engine. Probably from the
grinding... I replaced the starter with a Skytec, aligned as best I
could to exactly the same position as the Rotax starter (off about
0.010" between the top and bottom ears of the starter flange and the
engine surface). The Skytec starter does exactly the same thing -
grinds the gears without really engaging.
Anyone have any ideas? Anything I should check before I start taking
apart the engine to get to the starter gears and clutch?
John
Message 6
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| Subject: | Trouble starting a 912 ULS |
Folks,
One more data point on the trouble starting: It is not the battery
current. I've connected a truck battery in parallel with the plane's
battery (so the ignition is switching more amps) and not solved the problem.
John
Message 7
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| Subject: | 914 Alternator Options |
I am building a Europa with a Rotax 914 engine. It has become clear to me that
my electrical power needs are unlikely to be met from the internal alternator.
The alternatives are the Rotax belt driven alternator, or the B&C SD20 alternator
driven off the vacuum pad. The belt driven alternator goes where I would
really like my air intake hoses to go, so the SD20 looks like an attractive
option. However when I look at my vacuum pad, it has a blanking plate, so I assume
that I would have to install the vacuum drive gear shaft. Is this correct
and can anyone advise me as to how difficult this is? Is it something that
I can do myself or, as it seems to require opening the gearbox, is this a Rotax
service center job? Thanks.
Jerry Fisher
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=405824#405824
Message 8
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| Subject: | Re: 914 Alternator Options |
N6ZY a crit :
>
> I am building a Europa with a Rotax 914 engine. It has become clear to me that
my electrical power needs are unlikely to be met from the internal alternator.
The alternatives are the Rotax belt driven alternator, or the B&C SD20 alternator
driven off the vacuum pad. The belt driven alternator goes where I would
really like my air intake hoses to go, so the SD20 looks like an attractive
option. However when I look at my vacuum pad, it has a blanking plate, so I
assume that I would have to install the vacuum drive gear shaft. Is this correct
and can anyone advise me as to how difficult this is? Is it something that
I can do myself or, as it seems to require opening the gearbox, is this a Rotax
service center job? Thanks.
>
>
Jerry,
Have you considered this option ?
http://contrails.free.fr/elec_second_alternateur.php
Best regards,
--
Gilles
http://contrails.free.fr
Message 9
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| Subject: | Re: 914 Alternator Options |
And there is this:
http://www.flygas.info/en/kit-double-alternator-for-rotax.html
Better as a 10A backup than additional power it seems to me.
Jan de Jong
On 8/2/2013 8:09 PM, Gilles Thesee wrote:
> <Gilles.Thesee@ac-grenoble.fr>
>
> N6ZY a crit :
>>
>> I am building a Europa with a Rotax 914 engine. It has become clear
>> to me that my electrical power needs are unlikely to be met from the
>> internal alternator. The alternatives are the Rotax belt driven
>> alternator, or the B&C SD20 alternator driven off the vacuum pad. The
>> belt driven alternator goes where I would really like my air intake
>> hoses to go, so the SD20 looks like an attractive option. However
>> when I look at my vacuum pad, it has a blanking plate, so I assume
>> that I would have to install the vacuum drive gear shaft. Is this
>> correct and can anyone advise me as to how difficult this is? Is it
>> something that I can do myself or, as it seems to require opening the
>> gearbox, is this a Rotax service center job? Thanks.
>>
>
> Jerry,
>
> Have you considered this option ?
>
> http://contrails.free.fr/elec_second_alternateur.php
>
> Best regards,
Message 10
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| Subject: | Trouble starting a 912 ULS |
Hi! John,
Where is your battery situated ? How far from the starter ? I had untold
problems with the Jabiru 3300 six cylinder until I put two Odessey 13Ah
batteries in parallel within 18" of the starter and used welding cables for
the leads.
Bingo not so much as a problem since.
Regards
Bob Harrison G-PTAG Europa now with 914 Rotax.
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of John
Elling
Sent: 02 August 2013 18:08
Subject: RotaxEngines-List: Trouble starting a 912 ULS
--> <jelling@newmexico.com>
Folks,
One more data point on the trouble starting: It is not the battery current.
I've connected a truck battery in parallel with the plane's battery (so the
ignition is switching more amps) and not solved the problem.
John
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