Today's Message Index:
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1. 09:08 AM - Re: Re: Rotax 912 UL - Re-starting Problem (Hugh McKay)
2. 11:46 AM - Re: Rotax 912 UL - Re-starting Problem (Roger Lee)
3. 10:29 PM - 912 UL vibration (U)
Message 1
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| Subject: | Re: Rotax 912 UL - Re-starting Problem |
Roger,
I don't quite understand your first sentence. Please explain in further
detail. Carbs have not been "rebuilt" since new (550 hours on the carbs - 5
years and 3 months ). I guess to check the floats to see if one is "sinking"
just take the bowl off and fill it with gas and see if the float "floats" or
"sinks". Right?
I will check the plug gap. Old original fuel pump. I do have a fuel
recirculation line.
Hugh G. McKay III, P.E.
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay@bellsouth.net
http://www.wwegeo.com
-----Original Message-----
From: Roger Lee
Sent: Wednesday, October 10, 2012 9:53 PM
Subject: RotaxEngines-List: Re: Rotax 912 UL - Re-starting Problem
Hi Hugh,
Make sure the float level in the carbs are at 10.5mm in height from the
outside edge of the carb. When were the carbs last rebuilt? If it is over 5
years regardless of hours you may want to do an overhaul. Check the floats
and make sure one isn't sinking (flooding) under pressure right after you
stop. Plug gap between .023 - .027 and not over 75 hours old. new fuel pump
or old? Do you have a fuel re-circulation line?
--------
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=385088#385088
Message 2
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| Subject: | Re: Rotax 912 UL - Re-starting Problem |
Hi Hugh,
To check float levels you do just remove the bowls and put fuel in with the floats.
The float pins should be equal to the fuel level. To check the float arm
level you need to turn the carb upside down. Place a mm ruler and place it on
the edge of the carb and measure the distance of the float arm up on the ruler.
The proper height is 10.5mm. This controls fuel level in the bowl which has
a big impact on the way the engine runs.
--------
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=385122#385122
Message 3
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| Subject: | 912 UL vibration |
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
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