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HomeAircraftHelicopterVario Sky Fox - Benzin - Evolution - Xtreme › K&N choke-not convincing
03-10-2010 07:41 AM  8 years agoPost 1
JOJO HELIS

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HI all,

I have just finished building the Vario Benzine trainer with on board auto start. I also installed a K&N filter (with choke) purchased from Vario too.

When I tried to fire up the engine when cold, I had to literally take the air filter out, and put my finger on the carb intake to "choke" the engine to get it firing. To be honest I am not convinced that this choke is closeing enough for it to be effective, since the plate that slides on the carb hole, only manages to cover maybe 30% of the area.

Has anyone been through this ordeal?

As it is, I am struggling to be able to start the engine when cold.

Regards and thanks

Jojo

Jojo Helis

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03-10-2010 01:22 PM  8 years agoPost 2
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What carb is on the motor? On the 603B carbs we have on the G230-270 motors here, the choke is also on the carb body.
Joe

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03-10-2010 01:30 PM  8 years agoPost 3
JOJO HELIS

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Hi Joe,

I appreciate your continued support on this forum especially when it comes to Vario products...

At the moment I am not close to the heli,(still at work), but from memory I can confirm that it's a Walbro, and also do remember that there is only one flap that opens and closes in the barrel, which presumably is the throttle flap. The K&N air filter does in fact have a chop flap that can be opened and closed, but the throw does not permit me to fully choke the carb!! Is this normal?

Thanks

Jojo

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03-10-2010 01:42 PM  8 years agoPost 4
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Usually the choke flap in the aircleaner does not sit tight against the body of the aircleaner, and does not do the job. The choke in the carb body is the butterfly type and works well. Some of the motors, depending on the model, will have the new carb installed without the choke. We specifly from Zenoah, the different carb with the choke installed for this reason. If you have a brass rod sticking out the bottom of your carb with or without a black "L" handle on it, you have the built in choke. If not, then you have a different carb and not much you can do, outside of leaving off the aircleaner and choking with your thumb.
Joe

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03-10-2010 02:03 PM  8 years agoPost 5
JOJO HELIS

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I see and understand your point, however I purchased everything from Vario purely to have minds at rest of not having to deal with these kind of problems. I am not sure what next to do, but shall see to it this evening as see whther I manage to make the flap "air tight" so that it is effective. If not I shall speak to Vario UK (john White) how is a great guy, but need to sort this out.

On second thoughts, I also read that many Zenoah owners manage to cold start these engines without the need of the choke, which to be honest is what made me decide to purchase an onboard starter too, but if I always need to choke at cold starts, then I am not sure whther I made the right decision and spend the money on the electric starter, unless I can find a way fo doing without the choke to fire the engine without needing to choke it first....

Jojo

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03-10-2010 02:26 PM  8 years agoPost 6
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If you only have the flap in the aircleaner, check to see if you can bend it in towards the carb giving a better seal, and hopefully that will work. As far as cold starting these motors, i have never been able to do this, until after the first run of the motor. Then, on additional flights it usually starts without much problem.
I do prime everything first as always.
Joe

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03-10-2010 02:30 PM  8 years agoPost 7
JOJO HELIS

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Many thanks for your support, I shall see what I can do this evening and keep you posted.

Thanks once again

Jojo

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03-11-2010 06:29 AM  8 years agoPost 8
JOJO HELIS

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Hi Joe,

as promised I have checked the actual choke mechanism and have to say that the lever which turns the flap was installed the other way round. Now I changed the lever by 180deg. and can have an opening and a totally closing carb port with the flap, so I have an effective choke, which also made my cold starting easy.

Once the engine was running(quite rich for now) I noticed that the pipe with clips between the silencer and manifold was leaking burnt oil. I was a bit surprized to notice that the material for this connecting (plastic?) pipe is too hard, and in my opinion, the clips on it, could not be that effective.

Why is this pipe so hard?, and why is it not say teflon used?
Thanks

Jojo

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03-11-2010 08:03 AM  8 years agoPost 9
~>Miha<~

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...

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03-11-2010 12:53 PM  8 years agoPost 10
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It is teflon. First, clean the pipe it is going on, then heat up with an heat gun and push it on. Then install the squeeze clamp. When installed properly, there is no problem. If its leaking on one end, more than likely the pipe is not spaced properly between the two.
Also, after motor break in of a few tanks, the black oily stuff will dissappear.
Joe

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03-11-2010 02:03 PM  8 years agoPost 11
JOJO HELIS

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malta (Europe)

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Great,
many thanks,
I shall follow your advise. Maybe it would be a good thing to put in a note re heating the pipe prior to installing in the assembly manual...

Jojo

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03-31-2010 11:58 AM  8 years agoPost 12
Christopher J

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How are things with your heli so far. You get your pipe issues sorted out?

I did what Joe recommended on heating the teflon and installing it, once slid onto the pipe or manifold I heated a little more to keep it soft and slid the clamp on. So far so good.

Hope things are going well with yours.

Christopher J
same as I ever was
"Still all set & Flying the original"

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03-31-2010 12:15 PM  8 years agoPost 13
JOJO HELIS

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malta (Europe)

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Hi and thanks for asking.
Yes in fact I did as suggested and put some heat on it to make it flexible until it takes its shape. I also sent a suggestion to John White (Vario UK) and asked him that a note should be written in the assembly guide. So far, so good too here

Jojo

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04-01-2010 03:47 AM  8 years agoPost 14
Christopher J

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Awsome! Glad to hear everything with it is good.

Christopher J
same as I ever was
"Still all set & Flying the original"

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