Today's Message Index:
----------------------
1. 10:38 AM - Need carb help please (sdemeyer)
2. 02:00 PM - Re: Need carb help please (Richard Girard)
3. 04:33 PM - Re: Need carb help please (Roger Lee)
4. 04:44 PM - Re: Need carb help please (Chris Blackmore)
5. 05:07 PM - Re: Need carb help please (sdemeyer)
6. 05:16 PM - Re: Need carb help please (sdemeyer)
Message 1
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| Subject: | Need carb help please |
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=280914#280914
Message 2
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| Subject: | Re: Need carb help please |
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@yahoo.com> wrote:
> scottsr1100rt@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
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=280914#280914
>
>
Message 3
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| Subject: | Re: Need carb help please |
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?
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
520-574-1080
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=280955#280955
Message 4
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| Subject: | Re: Need carb help please |
Yes, replace the needle valve to prove the point after checking it .....D
on
t mix and match, check to see if it is aligned going to the seat and not
hanging up, did the jets come out?
-------Original Message-------
From: Richard Girard
Subject: Re: RotaxEngines-List: Need carb help please
If you have a fuel boost pump drop the float bowl, turn on the pump and s
ee
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@yahoo.com> wrot
e:
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 we
eks
When I start the engine, it runs fine for a minute then starts puking fue
l
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=280914#280914
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Message 5
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| Subject: | Re: Need carb help please |
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
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=280961#280961
Message 6
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| Subject: | Re: Need carb help please |
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.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=280962#280962
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