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sdemeyer
Joined: 31 Jul 2009
Posts: 45
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 Posted: Sun Jan 10, 2010 10:35 am Post subject: Need carb help please |
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I rebuilt the carbs on my 912UL and now have a frustrating problem I can't seem to resolve. I've been pulling my hair out on this for a couple of weeks.
When I start the engine, it runs fine for a minute then starts puking fuel out the overflow, then starts running like crap. I've triple checked the float level and the float bracket is exactly parallel as the manual instructs.
The kit I purchased ( from California Air ) included o-rings, gaskets, needle and main jet and I replaced everything.
I'm tempted to put back the original needles and see what happens.
Have any of you had this problem? How did you fix?
Thanks,
Scott
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Sun Jan 10, 2010 2:00 pm Post subject: Need carb help please |
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If you have a fuel boost pump drop the float bowl, turn on the pump and see if you can stop the flow of fuel by manually pushing the needle valve against the seat. While you've got it open pull the needle valve out and look it over with a magnifying glass to see it the needle tip is scarred.
Rick Girard
On Sun, Jan 10, 2010 at 12:35 PM, sdemeyer <scottsr1100rt(at)yahoo.com (scottsr1100rt(at)yahoo.com)> wrote:
[quote] --> RotaxEngines-List message posted by: "sdemeyer" <scottsr1100rt(at)yahoo.com (scottsr1100rt(at)yahoo.com)>
I rebuilt the carbs on my 912UL and now have a frustrating problem I can't seem to resolve. I've been pulling my hair out on this for a couple of weeks.
When I start the engine, it runs fine for a minute then starts puking fuel out the overflow, then starts running like crap. I've triple checked the float level and the float bracket is exactly parallel as the manual instructs.
The kit I purchased ( from California Air ) included o-rings, gaskets, needle and main jet and I replaced everything.
I'm tempted to put back the original needles and see what happens.
Have any of you had this problem? How did you fix?
Thanks,
Scott
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Sun Jan 10, 2010 4:30 pm Post subject: Re: Need carb help please |
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Hi Scott,
After you re-installed the carbs did you mechanically and pneumatically balance them? It is an absolute have to do item. An out of balance/sync carb setup will run rough and puke fuel like crazy. Is it hard starting? You may have put the en-richer circuit in backwards if it is hard to start on top of your problems. Does the problem clear up if you go up to 4000 rpm?
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
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blackmore(at)platinum.ca
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| Posted: Sun Jan 10, 2010 4:44 pm Post subject: Need carb help please |
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Yes, replace the needle valve to prove the point after checking it . E...Don't mix and match, check to see if it is aligned going to the seat and not hanging up, did the jets come out?
[i]----
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sdemeyer
Joined: 31 Jul 2009
Posts: 45
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| Posted: Sun Jan 10, 2010 5:04 pm Post subject: Re: Need carb help please |
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Well, I replaced the needles with the old set and the overflow problem stopped. Kind of weird because the new needle was exactly the same size,
just had a black tip instead of a red tip the original needle had.
Anyhow, I got the motor running OK and was able to do a complete mechanical sync and pneumatic sync. It still is not running very smooth at idle though and my carbtune shows a perfect balance. I'm pretty sure I still have a carb issue so I think I will just send them somewhere to be rebuilt, again. I'm too frustrated to even look at it anymore!
Has anyone had experience with the Bing Pro Carb shop in KS?
Scott
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sdemeyer
Joined: 31 Jul 2009
Posts: 45
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| Posted: Sun Jan 10, 2010 5:13 pm Post subject: Re: Need carb help please |
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| Roger Lee wrote: | Hi Scott,
After you re-installed the carbs did you mechanically and pneumatically balance them? It is an absolute have to do item. An out of balance/sync carb setup will run rough and puke fuel like crazy. Is it hard starting? You may have put the en-richer circuit in backwards if it is hard to start on top of your problems. Does the problem clear up if you go up to 4000 rpm? |
I did a preliminary sync because the carbs would puke before I could get started with my carbtune. The engine ran OK for the first minute and started fine. I quadruple checked the enricher circuit and it is installed correct. After I replaced the needle with original, throttle range is good except the idle ( 2000 - 1800 rpm) is rough.
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Dick Maddux
Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl
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| Posted: Mon Jan 11, 2010 7:35 am Post subject: Need carb help please |
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Scott,
I had the same problem you did...Exactly ! I too put in the new needles and it too puked fuel out the carbs and made a mess. I then removed the new needles comparing them to the old and I believe the springs in the new ones are too strong (at least it felt that way) anyway the new needles are in now stored in my parts case and I am running perfectly fine on the old ones with no problems and that is the way it will stay. This happen to me about a year ago when I was trying to upgrade my rubber parts due to age.
Dick Maddux
912 UL
Milton,Fl
[quote][b]
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sdemeyer
Joined: 31 Jul 2009
Posts: 45
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| Posted: Mon Jan 11, 2010 9:22 am Post subject: Need carb help please |
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Well, that puts me at ease a little! I wonder if, because my carbs are very early model ( 1998 ) if the seats or floats are different than a newer carb?
--- On Mon, 1/11/10, catz631(at)aol.com <catz631(at)aol.com> wrote:
| Quote: |
From: catz631(at)aol.com <catz631(at)aol.com>
Subject: Re: RotaxEngines-List: Need carb help please
To: rotaxengines-list(at)matronics.com
Date: Monday, January 11, 2010, 7:33 AM
Scott,
I had the same problem you did...Exactly ! I too put in the new needles and it too puked fuel out the carbs and made a mess. I then removed the new needles comparing them to the old and I believe the springs in the new ones are too strong (at least it felt that way) anyway the new needles are in now stored in my parts case and I am running perfectly fine on the old ones with no problems and that is the way it will stay. This happen to me about a year ago when I was trying to upgrade my rubber parts due to age.
Dick Maddux
912 UL
Milton,Fl
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Tue Jan 12, 2010 3:35 pm Post subject: Re: Need carb help please |
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You guys may want to double check the numbers n those needles and main jets. If you mistakenly put one in for an 80 hp for 100 hp or the other way around it won't run right. Make sure the kit that is sent you is the right one for the correct HP. (80 or 100) You can't tell just by looking at a distance you need to look at the numbers stamped on the sides of the part.
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Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
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