Today's Message Index:
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1. 10:50 AM - Re: Rotax 503 (rayw)
2. 11:14 AM - Re: Re: Rotax 503 (rparigor@suffolk.lib.ny.us)
3. 12:10 PM - Re: Re: Rotax 503 (Dave G)
4. 01:06 PM - Re: Re: Rotax 503 (=?ISO-8859-1?Q?J=F3hann_J=F3hannsson?=)
5. 07:22 PM - Re: Rotax 503 (rayw)
Message 1
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First of all I want to thank those that replied. Every idea I received gave me
something to consider. Here is where it's at today:
After running up to 1500 RPM. I used a can of starting fluid and sprayed every
nook and cranny. Pretty much every where except in the carb inlets (ok just a
little to see what would happen)(It bogged). I heard no change at all other than
that. When I wasn't spraying I was watching CHT's and EGT's. CHT's could not
get warm enough to even get into the green. EGT's could barely get in the green
if I ran up to 2000 RPM and let it go for awhile. Sounds like a very rich
condition yes???
Now for a little back ground: I bought this airplane from a couple of good ol'
boys in St. Joe, MO. (That is a story in itself). Now mind you I have nothing
against good ol' boys from St. Joe......... When I got I home and got down to
details. I found a lot of things not acceptable to me. I have never heard it
run or saw it fly. Normally a red flag but I got it so cheap I couldn't pass it
up. My wife would argue but I still think it was worth it. Any way enough rambling.
Both carbs have main jets = 158, Idler jet = 45, Needle jet = 2.7, Jet needle =
1K2. The top ring of the needle has the O-ring and the clip right under it on
the second ring. The air screw is at .5. The floats arms are level when the carbs
are upside down. I believe I have the recommended 1/2 inch of space between
the top of the float bowl and the gas level in the bowl.
Altitude at Stevens Point, WI (5 miles away) is 1050 ASL. The three finger test
mentioned in my last post still has me scratching my head. It tells me that the
carbs are still different in some way. Is a K&N air filter considered a "silencer"?
Thanks every one,
Ray W.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=274101#274101
Message 2
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Hi Ray
I'm a dinosaur, but remember in early 80s someone had
what sounds like the exact problem you are describing on a Cayuna 2
cylinderI think with 1 carb for both cylinders, it was air cooled.
Owner was supposedly a crackerjack mechanic and was trying to solve for
some time. I fooled withfor a short time and descided to do a thumb
in spark plug test, one cylinder was dead, hole in piston.
Sorry I am unfamiliar with 503, don't know if it has one or 2 carbs.
Did you check compression?
Ron Parigoris
Message 3
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I'm going to toss in these two really silly questions. 1)There is a prop on
this set to provide a load? and 2) you have checked the gap on the plugs and
none of them are even a tiny bit more than specified?
The reason I ask is that engines get way weird without the proper load, and
the coils on these are not particularly powerful, wide gaps are a bad idea.
----- Original Message -----
From: "rayw" <rmwis@charter.net>
Sent: Saturday, November 21, 2009 2:49 PM
Subject: RotaxEngines-List: Re: Rotax 503
>
> First of all I want to thank those that replied. Every idea I received
> gave me something to consider. Here is where it's at today:
>
> After running up to 1500 RPM. I used a can of starting fluid and sprayed
> every nook and cranny. Pretty much every where except in the carb inlets
> (ok just a little to see what would happen)(It bogged). I heard no change
> at all other than that. When I wasn't spraying I was watching CHT's and
> EGT's. CHT's could not get warm enough to even get into the green. EGT's
> could barely get in the green if I ran up to 2000 RPM and let it go for
> awhile. Sounds like a very rich condition yes???
>
> Now for a little back ground: I bought this airplane from a couple of good
> ol' boys in St. Joe, MO. (That is a story in itself). Now mind you I have
> nothing against good ol' boys from St. Joe......... When I got I home and
> got down to details. I found a lot of things not acceptable to me. I have
> never heard it run or saw it fly. Normally a red flag but I got it so
> cheap I couldn't pass it up. My wife would argue but I still think it was
> worth it. Any way enough rambling.
>
> Both carbs have main jets = 158, Idler jet = 45, Needle jet = 2.7, Jet
> needle = 1K2. The top ring of the needle has the O-ring and the clip right
> under it on the second ring. The air screw is at .5. The floats arms are
> level when the carbs are upside down. I believe I have the recommended 1/2
> inch of space between the top of the float bowl and the gas level in the
> bowl.
>
> Altitude at Stevens Point, WI (5 miles away) is 1050 ASL. The three finger
> test mentioned in my last post still has me scratching my head. It tells
> me that the carbs are still different in some way. Is a K&N air filter
> considered a "silencer"?
>
> Thanks every one,
>
> Ray W.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=274101#274101
>
>
>
Message 4
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Hello Ray.
One thing to look into. The tube from the crank to the fuel pump. Make
sure that it is not from a thin wall tube and not too long. If so, it
could clamp together and prevent the fuel pump to suck enough fuel to
the carbs.
It could also be leaking.
Check it out, it is rally easy and cheap to fix.
Hope this helps,
Regards.
Johann G.
On 21.11.2009, at 18:49, rayw wrote:
>
> First of all I want to thank those that replied. Every idea I
> received gave me something to consider. Here is where it's at today:
>
> After running up to 1500 RPM. I used a can of starting fluid and
> sprayed every nook and cranny. Pretty much every where except in the
> carb inlets (ok just a little to see what would happen)(It bogged).
> I heard no change at all other than that. When I wasn't spraying I
> was watching CHT's and EGT's. CHT's could not get warm enough to
> even get into the green. EGT's could barely get in the green if I
> ran up to 2000 RPM and let it go for awhile. Sounds like a very rich
> condition yes???
>
> Now for a little back ground: I bought this airplane from a couple
> of good ol' boys in St. Joe, MO. (That is a story in itself). Now
> mind you I have nothing against good ol' boys from St. Joe.........
> When I got I home and got down to details. I found a lot of things
> not acceptable to me. I have never heard it run or saw it fly.
> Normally a red flag but I got it so cheap I couldn't pass it up. My
> wife would argue but I still think it was worth it. Any way enough
> rambling.
>
> Both carbs have main jets = 158, Idler jet = 45, Needle jet = 2.7,
> Jet needle = 1K2. The top ring of the needle has the O-ring and the
> clip right under it on the second ring. The air screw is at .5. The
> floats arms are level when the carbs are upside down. I believe I
> have the recommended 1/2 inch of space between the top of the float
> bowl and the gas level in the bowl.
>
> Altitude at Stevens Point, WI (5 miles away) is 1050 ASL. The three
> finger test mentioned in my last post still has me scratching my
> head. It tells me that the carbs are still different in some way. Is
> a K&N air filter considered a "silencer"?
>
> Thanks every one,
>
> Ray W.
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=274101#274101
>
>
Message 5
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Hello,
I cannot seem to find a Rotax 503 repair manual for purchase. Does any one know
of a source. It would be nice to know things like bolt torque specs and pattern,
plug gap, acceptable cylinder compression etc.
I did a compression check and got 115 front and back. The plug gap should be ok
because the plugs are brand new. The prop is bolted on and is providing a suitable
load. All fuel lines are brand new including the impulse line for the fuel
pump. The impulse line is 6 inches long and was ordered from LEAF specifically
for this purpose. The entire fuel system is brand new. This airplane did not
even have a fuel tank when I bought it.
It is an older engine with points ignition. I was told the engine has 160 hours.
Both slides are reacting the same when responding to the throttle.
Thanks every one!!
Ray
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=274171#274171
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