Today's Message Index:
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1. 06:12 AM - Re: Re: Firestar KXP (zeprep251@aol.com)
2. 06:56 AM - Re: Firestar KXP (Jay Dub)
3. 12:35 PM - Re: Firestar KXP (kolbflyer)
Message 1
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| Subject: | Re: Firestar KXP |
2 strokes require a lot of fuel when cold because the mixture enters the c
rankcase before it gets into the combustion chamber ,and when cold the fuel
doesn't stay atomize. My 503 wanted 3 direct shots of prime choke on,throt
tle closed, one pull.
On Tuesday, January 3, 2023, 5:11:21 PM EST, kolbflyer <j-lauer@live.co
m> wrote:
Any recommendations on starting a Rotax 447?=C2- I have a prime bulb (lik
e a boat gas tank) to prime the fuel pump, Primer to prime the carb, choke
on, throttle cracked, ignition on, and pull start.=C2- Once started, turn
off choke immediately and set idle to 2500 for 2min.=C2- Monitor EGT and
CHT temps.
Today was the first time starting the motor since purchase and it sat for a
bout 3 weeks due to weather and personal stuff going on.=C2- Took about 4
0min and LOTS of pulls to get it started.=C2- I've looked into getting th
e electric adapter, but can't afford the weight penalty as I'm trying to ke
ep it as close to 103 as possible.=C2- I wish there was a portable electr
ic starter system that wouldn't be added to plane weight.
Thanks for any recommendations.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509858#509858
S -
WIKI -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 2
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| Subject: | Re: Firestar KXP |
Nobody has mentioned it but I think you may have answered part of the issue. You
said, "fuel is unknown age." The Rotax engines do not like old mixed fuel. Jerry
Olenik of Greensky aviation (since passed away from cancer) back in the 90's
said the number one reason he saw for seizures and other running issues coming
into his Rotax shop was old fuel. He recommended if the fuel, once mixed,
is more than 2 weeks old, siphon it out and just run it in something else like
a 4 stroke lawnmower or a 4 stroke motorcycle that doesn't have a catalytic
converter. At that time he was convinced that if people ran freshly mixed fuel
it would eliminate most issues. He said he made a lot of money from people running
old mixed fuel. That seemed rather short to me and I would smell the fuel
and change it at the first hint of smelling old and I did get over 450 hours
out of that engine before selling the plane with just 2 decarbon jobs. There
were times though the fuel was only a couple of weeks old and it was smelling
rancid/varnishy.
On another note, my 447 back in the 90s needed to run with the choke/enrichener
on full for a minute or two at a fast idle in the winter and about 20-30 seconds
in the summer. You can hear the engine when it starts loading up with extra
fuel and that's when you can turn it off.
It does sound like you had the prop installed which is good as the manual states
specifically not to run the engine without a prop or damage can occur. Just
wanted to make sure you knew.
As was mentioned the carb to intake boots were notorious for cracking with age
making a lean condition and seizing engines. It is an item you need to inspect
every preflight and periodically change it out at the first signs of cracking.
There was a recommendation made by rotax at how often but my memory is not good
enough to tell you what that is. There was an aftermarket company that made
boots with a different material, not prone to cracking, but I don't recall the
name of the company. I bought one of their boots that will be going on my 447
that will be going on my Firestar in a month or two that I am covering right
now.
Jay
Sent:Tuesday, January 03, 2023 at 4:32 PM
From:"kolbflyer" <j-lauer@live.com>
To:kolb-list@matronics.com
Subject:Kolb-List: Re: Firestar KXP
I seemed to have the. throttle open quite a ways as it ramped ups quickly (thank
got it was tied to the truck). tail lifted up and everything. I'll try it with
keeping the throttle closed to ensure the choke system works right...sounds
just like my Rotax 912UL when starting cold.
The fuel is unknown age, didn't check the spark plugs, but have some on order to
swap out. I'll check the carb boot and the cable boots too. the throttle cable
looks older and has some bends in it towards the lever. I've also bought some
spare spark plug wires as the boots are all dry rotted but not falling apart
yet.
the plan was to start it outside with the brake set and wheels chocked and pull
the chock when ready to taxi.
thanks all, now to work on the trailer system (finding the right trailer and getting
it to support everything properly).
Message 3
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| Subject: | Re: Firestar KXP |
Richard,
Thanks for the link and I'll try to remember it when I get another windows machine.
Can I go back and resize the pics after they have been posted? I'm sure
I can find an app for the Mac to do that.
Jayzeprep,
thanks for those data points on starting in the cold. I did reach out to Rotax
Rick and he stated to filter the crap out of the gas, keep it fresh (no older
than 2 weeks), and mix it to 40:1 with Amsoil Interceptor 2-stroke oil.
Weather is crappy once again, but hopefully I can get it back out this weekend,
unfold it, and run it some more with fresh gas, throttle closed, full choke,
3 squirts of prime. I want to get it up to temp and try to clear everything out
that has been sitting. I really need to get a trailer and to an airport to
be able to run. it up better than just in my driveway.
Thanks everyone.
Jeremy
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509883#509883
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