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flynn elliott
Joined: 23 Jun 2007
Posts: 20
Location: SOUTH AFRICA
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 Posted: Wed Jun 17, 2009 8:53 am Post subject: Carb flooding |
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Hi all, a friend of mine has just finished his 912s powered Savana build and has been running up the motor. Starts on the button and super smooth, however after six or seven minutes of taxi up and down the air strip the port side carb overflows and the motor runs very rough.
We shut down right away and the float bowl is totally full, indicating a needle and seat problem, when we pressurise the carbs engine off-fuel pump on then check float level all is normal .Seems this carb will only overflow when the motor is running.
Both carbs have just come back from the Rotax agent after being checked over , re installed today but the same problem persist.
Any idea's please.
Flynn
South Africa
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thilo.kind(at)gmx.net
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| Posted: Wed Jun 17, 2009 12:51 pm Post subject: Carb flooding |
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Hi Flynn,
Could it be a blockage of the carb overflow tube? The overflow tubes of both carbs need to see the same pressure, otherwise flooding will occur. If you extend the overflow tubes, the pressure will vary.
Good luck
Thilo
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of flynno
Sent: Wednesday, June 17, 2009 18:40
To: rotaxengines-list(at)matronics.com
Subject: Carb flooding
Hi all, a friend of mine has just finished his 912s powered Savana build and has been running up the motor. Starts on the button and super smooth, however after six or seven minutes of taxi up and down the air strip the port side carb overflows and the motor runs very rough.
We shut down right away and the float bowl is totally full, indicating a needle and seat problem, when we pressurise the carbs engine off-fuel pump on then check float level all is normal .Seems this carb will only overflow when the motor is running.
Both carbs have just come back from the Rotax agent after being checked over , re installed today but the same problem persist.
Any idea's please.
Flynn
South Africa
| Quote: | | http://www.matronics.com/Navigator?RotaxEngines-List |
0123456789
No virus found in this incoming message. Checked by AVG - www.avg.com 270.12.70/2177 - Release Date: 06/17/09 17:55:00 [quote][b]
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kjburns(at)btinternet.com
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| Posted: Wed Jun 17, 2009 1:59 pm Post subject: Carb flooding |
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Flynn,
I have seen this problem caused by a sliver of rubber cut from inside the rubber fuel hose blocking the float needle from seating, carb may be cleaned then checked on the bench then a sharp edge downstream of filter can send a slver in to the float bowl, other problems may be caused by gell from automotive fuels evaporating in the carb.
Kevin
From: Thilo Kind <thilo.kind(at)gmx.net>
To: rotaxengines-list(at)matronics.com
Sent: Wednesday, 17 June, 2009 9:50:41 PM
Subject: RE: Carb flooding
Hi Flynn,
Could it be a blockage of the carb overflow tube? The overflow tubes of both carbs need to see the same pressure, otherwise flooding will occur. If you extend the overflow tubes, the pressure will vary.
Good luck
Thilo
From: owner-rotaxengines-list-server(at)matronics.com [mailto:owner-rotaxengines-list-server(at)matronics.com] On Behalf Of flynno
Sent: Wednesday, June 17, 2009 18:40
To: rotaxengines-list(at)matronics.com
Subject: Carb flooding
Hi all, a friend of mine has just finished his 912s powered Savana build and has been running up the motor. Starts on the button and super smooth, however after six or seven minutes of taxi up and down the air strip the port side carb overflows and the motor runs very rough.
We shut down right away and the float bowl is totally full, indicating a needle and seat problem, when we pressurise the carbs engine off-fuel pump on then check float level all is normal .Seems this carb will only overflow when the motor is running.
Both carbs have just come back from the Rotax agent after being checked over , re installed today but the same problem persist.
Any idea's please.
Flynn
South Africa
| Quote: | | http://www.matronics.com/Navigator?RotaxEngines-Listhttp://forums.matronics.com |
012
No virus found in this incoming message. Checked by AVG - www.avg.com 270.12.70/2177 - Release Date: 06/17/09 17:55:00 3
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JRatcli256(at)aol.com
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| Posted: Thu Jun 18, 2009 2:51 am Post subject: Carb flooding |
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Flynn,
I had the same problem the first time I started my 912ULS. My attempted solution was to clean the carb that was flooding. Did this several times with no improvement. Finally decided to clean the other carb. Ran fine after that.
Also, if you have an aux fuel pump on continuously could be over pressuring the float bowl.
Hope this helps -- John Ratcliffe
Download the AOL Classifieds Toolbar for local deals at your fingertips.
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flynn elliott
Joined: 23 Jun 2007
Posts: 20
Location: SOUTH AFRICA
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| Posted: Thu Jun 18, 2009 8:14 am Post subject: Carb Flooding |
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Many thanks to all for your help and suggestions, we are methodically going through the processes, a last ditch resort will be to take a carb off my 912 and install on my friends motor,wont be perfectly balanced but will at least eliminate one area.
Cheers again will post any results
Flynn
[quote][b]
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ami(at)mcfadyean.freeserv
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| Posted: Thu Jun 18, 2009 1:17 pm Post subject: Carb Flooding |
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Can also be caused by resonances, e.g. resulting from the carb rubber mounting clip being too loose and/or unbalanced carbs..
Duncan McF.
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