Today's Message Index:
----------------------
1. 01:48 PM - Engine roughness (Hugh McKay)
2. 01:54 PM - Re: Engine roughness (Roger Lee)
3. 04:24 PM - 912 17mm Water Hose Again (ricklach)
4. 05:35 PM - Re: 912 17mm Water Hose Again (Ellery Batchelder Jr)
5. 06:19 PM - Re: 912 17mm Water Hose Again (Roger Lee)
6. 07:52 PM - Re: 912 17mm Water Hose Again (Richard Girard)
Message 1
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| Subject: | Engine roughness |
I need some help and advice. I was mechanically adjusting my carbs
yesterday, and in the process I thought I would check the position of
the Idle Mixture screw on the bottom of the carbs. I ran the screws in
fully closed, and then backed them out the 1.5 turns as recommended by
Rotax. The engine now runs rough at idle, and in the operating range up
to 3000 rpm. You can feel it. I did not increase the speed beyond 3000
rpm for fear of harm to the engine. Unfortunately I did not count the
number of turns it took to close the Idle Mixture Screws, so I don't
know if they were set at 1.5 turns (counterclockwise) initially. I have
not pneumatically checked the balance. What are some of the conditions
that can cause this type rough engine operation?
Hugh McKay
Allegro 2000
Rotax 912 UL
Message 2
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| Subject: | Re: Engine roughness |
Hi Hugh,
Those mixture screws should be set before a pneumatic balance. Since you now have
those set you absolutely need to do a pneumatic balance. Leave the screws at
1.5 turns out. The roughness is because they are helping with the mixture at
the low rpms. As you go above 3500 rpm to 4000+rpm that circuit now longer is
in play. After the pneumatic balance I would bet your engine will be smooth.
--------
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=308271#308271
Message 3
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| Subject: | 912 17mm Water Hose Again |
I know we have had this conversation before, but Im hopping for some new information.
I need to replace the eight 17MM water hoses that go from the water pump
to the heads on the bottom of the engine and then from the heads on the top
to the water tank on the 912 engine. I know that some people have used inch hose
but Im not comfortable with it because its a little big. Has anyone found
a source for real 17mm hose for this application? :?
--------
701Driver
N35 26.700, W118 16.743
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=308297#308297
Message 4
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| Subject: | Re: 912 17mm Water Hose Again |
Rick
I have gone to CarQuest and Purchased Molded hose for this same problem yo
u might have to go out back and go through there hoses department to find
what your looking for and maybe buy some longer hoses and cut them off
to get them to where you want them go
Ellery Batchelder Jr.
-----Original Message-----
From: ricklach <rick@ravenaviation.us>
Sent: Tue, Aug 10, 2010 7:23 pm
Subject: RotaxEngines-List: 912 17mm Water Hose Again
>
I know we have had this conversation before, but I=C3=A2=82=AC=84=A2
m hopping for some new
nformation. I need to replace the eight 17MM water hoses that go from the
water
ump to the heads on the bottom of the engine and then from the heads on th
e top
o the water tank on the 912 engine. I know that some people have used =C3
=82=C2=BE inch
ose but I=C3=A2=82=AC=84=A2m not comfortable with it because it=C3
=A2=82=AC=84=A2s a little big. Has anyone
ound a source for real 17mm hose for this application? :?
--------
01Driver
35 26.700, W118 16.743
ead this topic online here:
http://forums.matronics.com/viewtopic.php?p=308297#308297
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Message 5
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| Subject: | Re: 912 17mm Water Hose Again |
Call California Power Systems (CPS) and ask for Jeremy McGregor. Tell him I sent
you. He should get you taken care of. 510-357-8192
He does not work Fridays and comes in at 1000 hrs. Monday thru Thursday.
--------
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=308305#308305
Message 6
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| Subject: | Re: 912 17mm Water Hose Again |
I use silicone hose from either Sport Hoses
http://www.sporthoses.com/parts/
or Pegasus Racing.
http://www.pegasusautoracing.com/advcat.asp?CategoryID=COOLING
Either has every shape and reducer you could want, Pegasus has more
components in addition to the hose. Both give fine service.
Rick Girard
On Tue, Aug 10, 2010 at 6:23 PM, ricklach <rick@ravenaviation.us> wrote:
s
> >
>
> I know we have had this conversation before, but I=92m hopping for some n
ew
> information. I need to replace the eight 17MM water hoses that go from th
e
> water pump to the heads on the bottom of the engine and then from the hea
ds
> on the top to the water tank on the 912 engine. I know that some people h
ave
> used =BE inch hose but I=92m not comfortable with it because it=92s a lit
tle big.
> Has anyone found a source for real 17mm hose for this application? :?
>
> --------
> 701Driver
> N35 26.700, W118 16.743
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=308297#308297
>
>
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