Today's Message Index:
----------------------
1. 12:29 AM - Re: 912 UL vibration (PHILLIPS I)
2. 01:42 AM - Re: 912 UL vibration (Sacha)
3. 11:11 AM - Re: 912 UL vibration (Sacha)
4. 07:17 PM - Re: 912 UL vibration (Roger Lee)
Message 1
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| Subject: | Re: 912 UL vibration |
Hi Sacha
I would double check that the prop isnt too corse first,
a pair of vacuum gauges
are the way to go too sinc the carbs, you could be way out by just
visually checking
the throttle linkage.
Ivor
On 12 October 2012 06:28, U <uuccio@gmail.com> wrote:
>
> Hello List
>
> Yesterday I started the engine on the Kitfox IV I'm rebuilding. It's a
> 912UL from 1997 with 375 hours that I purchased about 6 months back.
> Before i purchased it, was checked by a qualified Rotax mechanic who among
> other things, changed a number of rubber parts.
>
> Before starting it, I manually checked the carb valves so that they were
> visually in a similar position. Anyway, the engine seems to have a rather
> strong vibration to it so I haven't run it for much more than 20-30 seconds
> at the time. I haven't had the carb valves aligned exactly with a pressure
> gauge, but the vibration is much more than what I would expect if it were
> just due to carb misalignment. And it doesn't seem to be the prop (a
> 3-blade Duc whose pitch has been set with the appropriate instrument).
>
> I called the Rotax mechanic who checked it and he suggested checking the
> carbs for obstructions which I have now done (I found an insect inside the
> left carb, but that didnt seem to change anything). I'll blow some
> compressed air through them today just to make sure that everything is
> clean.
>
> Does anyone have any suggestions as to what I could try next? The closest
> Rotax mechanic is a 5 hour drive from where I am in Sicily so I don't want
> to call him out before I have tried everything that I can do personally.
>
> Sacha
>
>
Message 2
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| Subject: | Re: 912 UL vibration |
Hi Ivor,
I just tried it with another prop and the vibrations are gone. Now I can sto
p torturing those poor carbs :-/ although I will have them synced with a vac
uum gauge.
Thank you
On Oct 12, 2012, at 9:28, PHILLIPS I <ivor.phillips@ntlworld.com> wrote:
> Hi Sacha
>
> I would double check that the prop isnt too corse first,
> a pair of vacuum gauges
> are the way to go too sinc the carbs, you could be way out by just visual
ly checking
> the throttle linkage.
>
> Ivor
>
> On 12 October 2012 06:28, U <uuccio@gmail.com> wrote:
>
> Hello List
>
> Yesterday I started the engine on the Kitfox IV I'm rebuilding. It's a 912
UL from 1997 with 375 hours that I purchased about 6 months back. Before i p
urchased it, was checked by a qualified Rotax mechanic who among other thing
s, changed a number of rubber parts.
>
> Before starting it, I manually checked the carb valves so that they were v
isually in a similar position. Anyway, the engine seems to have a rather st
rong vibration to it so I haven't run it for much more than 20-30 seconds at
the time. I haven't had the carb valves aligned exactly with a pressure ga
uge, but the vibration is much more than what I would expect if it were just
due to carb misalignment. And it doesn't seem to be the prop (a 3-blade Du
c whose pitch has been set with the appropriate instrument).
>
> I called the Rotax mechanic who checked it and he suggested checking the c
arbs for obstructions which I have now done (I found an insect inside the le
ft carb, but that didnt seem to change anything). I'll blow some compressed
air through them today just to make sure that everything is clean.
>
> Does anyone have any suggestions as to what I could try next? The closest R
otax mechanic is a 5 hour drive from where I am in Sicily so I don't want to
call him out before I have tried everything that I can do personally.
>
> Sacha
>
>
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ist
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> ==========
> le, List Admin.
> ="_blank">http://www.matronics.com/contribution
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Message 3
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| Subject: | Re: 912 UL vibration |
On my Duc propeller, two of the blades were a newer vintage and one was an o
lder blade of the same model. It turns out the newer blades are lighter than
the older ones and this is what was creating the vibration. I swapped out t
he old blade for a new one and it now runs perfect...
On Oct 12, 2012, at 10:41, Sacha <uuccio@gmail.com> wrote:
> Hi Ivor,
> I just tried it with another prop and the vibrations are gone. Now I can s
top torturing those poor carbs :-/ although I will have them synced with a v
acuum gauge.
>
> Thank you
>
> On Oct 12, 2012, at 9:28, PHILLIPS I <ivor.phillips@ntlworld.com> wrote:
>
>> Hi Sacha
>>
>> I would double check that the prop isnt too corse first,
>> a pair of vacuum gauges
>> are the way to go too sinc the carbs, you could be way out by just visua
lly checking
>> the throttle linkage.
>>
>> Ivor
>>
>> On 12 October 2012 06:28, U <uuccio@gmail.com> wrote:
>>
>> Hello List
>>
>> Yesterday I started the engine on the Kitfox IV I'm rebuilding. It's a 91
2UL from 1997 with 375 hours that I purchased about 6 months back. Before i
purchased it, was checked by a qualified Rotax mechanic who among other thi
ngs, changed a number of rubber parts.
>>
>> Before starting it, I manually checked the carb valves so that they were v
isually in a similar position. Anyway, the engine seems to have a rather st
rong vibration to it so I haven't run it for much more than 20-30 seconds at
the time. I haven't had the carb valves aligned exactly with a pressure ga
uge, but the vibration is much more than what I would expect if it were just
due to carb misalignment. And it doesn't seem to be the prop (a 3-blade Du
c whose pitch has been set with the appropriate instrument).
>>
>> I called the Rotax mechanic who checked it and he suggested checking the c
arbs for obstructions which I have now done (I found an insect inside the le
ft carb, but that didnt seem to change anything). I'll blow some compressed
air through them today just to make sure that everything is clean.
>>
>> Does anyone have any suggestions as to what I could try next? The closest
Rotax mechanic is a 5 hour drive from where I am in Sicily so I don't want t
o call him out before I have tried everything that I can do personally.
>>
>> Sacha
>>
>>
>> ==========
>> -List" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-
List
>> ==========
>> http://forums.matronics.com
>> ==========
>> le, List Admin.
>> ="_blank">http://www.matronics.com/contribution
>> ==========
>>
>>
>>
>>
>>
>>
==========================
=========
==========================
=========
==========================
=========
==========================
=========
>>
Message 4
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| Subject: | Re: 912 UL vibration |
No blades should ever be swapped from a set. These are usually picked for
For their weight And balanced together with that hub. If you do try and mix blades
then they have to be balanced.
--------
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
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