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HelicopterGasser Model RC HelicoptersOther › Hard to start but runs realy nice !!!
10-04-2010 05:57 PM  7 years agoPost 1
jgoodsell

rrApprentice

Sherbrooke, Qc,​Canada

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Hello fellow heli geeks,

Last week-end, I had Raja and his friend Larry get my heli going SOOoo Nice down at the heli phenomenon in Mansfield.

Now I'm back to Canada and finaly got a chance to fly in this week-end. The thing is a real pain to start... cranking forever and when the engine is finaly starting to stumble, it does it 3 times before it realy starts...Once started it's flys just as good as when I was down in MA.

To get a good idle and not have the clutch engage I need to have the throttle trim at 25% from the usual 50%. Other then that I havn't changed anything in the settings .

My feeling is the the low needle could be a little lean.

What's your feeling on this ?

* I have the 644 carb with choke that I use when (trying) starting

Jeffrey

It seams that Gravity is worst around here !

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10-05-2010 01:54 PM  7 years agoPost 2
AceBird

rrElite Veteran

Utica, NY USA

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* I have the 644 carb with choke that I use when (trying) starting
I am not sure exactly what procedure you are using but I would put the trim back where it was. Do two pulls with the choke on then turn off the choke. It should start in a couple more pulls and then turn your trim back down.

Note: you could leave the trim at 25% and just move the throttle up one click and push it back down when it starts.

If it is much cooler in Canada right now you may have to have some amount of choke on until the engine warms up. Unfortunately, that is trial and error until you figure it out. The tell tail is it will start after a full choke and then no choke but quit. Do the full choke again for another pull but don't go all the way open on the next try. It should run longer or stay running.

Let's hope the trip home didn't lodge some dirt in a orifice somewhere.

Ace
What could be more fun?

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10-05-2010 02:36 PM  7 years agoPost 3
BeltFedBrowning

rrKey Veteran

Kansas City

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Good advice Ace. I would get the weedeater or chainsaw out and see how they run this time of year. I bet it is similar!

perfer et obdura; dolor hic tibi proderit olim

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10-12-2010 05:24 PM  7 years agoPost 4
jgoodsell

rrApprentice

Sherbrooke, Qc,​Canada

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Well I flew a whole 70 minutes this Week-end and I still have a F'kinghard time starting..

I changed the screen in the carb because it had been cleaned a few weeks back ( sept 27) but did require changing. This hasn't changed the way the engine runs. It ran the best I've seen it in all time.

So when I start, I close the choke, prime till there's fuel in the overflow, then I pull and pull..... many minutes... waiting for a little burp or something that sounds like an engine wanting to start....It just never happens.. I then try without choke for a while... with throttle open + choke throttle open no Choke.. re prime. Remove the plug a let let it rest for a minute....then retry ... it eventually starts for a half second with throttle no-choke, then a whole second, and then it goes with some hesitation .... Idles nice too !

I changed my throttle rod so it would idle at half trim and it flew wonderful !!!

My plug is a little on the goo wee side so my guess is that I could be rich on the low OR could it be that my coil is too far out the generate a proper spark at low RPM !??

thanks for your inputs

Jeffrey

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10-13-2010 01:39 AM  7 years agoPost 5
jgoodsell

rrApprentice

Sherbrooke, Qc,​Canada

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It's official, I'm flooding on start-up

It's official, I'm flooding the engine every time.

How to start it without flooding ??
Does the tuning have anything to do with it ??

Jeffrey

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10-13-2010 03:54 AM  7 years agoPost 6
lejon

rrVeteran

Las Vegas, Nevada

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Try not closing the choke.

If that doesn't work then choke and pull twice then take choke off. Make sure your start position on the butterfly is open less than a 16th". About the space between the top of these two lines /\.

Lejon

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10-13-2010 01:42 PM  7 years agoPost 7
AceBird

rrElite Veteran

Utica, NY USA

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So when I start, I close the choke, prime till there's fuel in the overflow, then I pull and pull..... many minutes... waiting for a little burp or something that sounds like an engine wanting to start...
No! Absolute not. Do not pull more than three times. Two should be enough. Three is too much. If your low needle is set rich one pull would definitely be enough.

If you are opening the choke and eventually getting it to start that is the tell tail that it got too much fuel. Back off on your choking. Note that once the engine has run it usually doesn't need any choke if you start it again within 15-20 minutes (summer flying).

Ace
What could be more fun?

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10-13-2010 05:37 PM  7 years agoPost 8
jgoodsell

rrApprentice

Sherbrooke, Qc,​Canada

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No! Absolute not. Do not pull more than three times. Two should be enough. Three is too much. If your low needle is set rich one pull would definitely be enough.
I'll try this tonight.

Trouble is that once I'm in this situation where it won't start, I can't try anything else because the engine is either warmed up and ready to fire or flooded/excessively rich ! So I have to wait a long while or the next day to try something new !!!

Anyways.. Thanks Ace.. I'll try this tonight and keep you all posted

Jeffrey

It seams that Gravity is worst around here !

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10-13-2010 06:05 PM  7 years agoPost 9
rc3po

rrVeteran

Danville, Illinois

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Try no choke.....

I use no choke, trim down all the way.. Starts on 4th sometimes fifth pull. I move trim up to sustain running..
Todd

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10-13-2010 06:26 PM  7 years agoPost 10
lejon

rrVeteran

Las Vegas, Nevada

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Clearing the flooded condition

Once it floods you can remove the plug and put trim to minimum and throttle to minimum and pull a few time to clear the cylinder. Then blow air (can or compressor) on the plug to dry or put in a different plug and you will be back at square one.

Lejon

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10-13-2010 06:41 PM  7 years agoPost 11
greenboot

rrVeteran

Marblehead, OH

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I had similar problems the first year with my Spectra. When the starter finally wore out, I switched to electric start. Now it takes just one button press to get it running and I'm really enjoying it.

Tom

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10-14-2010 02:15 PM  7 years agoPost 12
AceBird

rrElite Veteran

Utica, NY USA

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So I have to wait a long while or the next day to try something new !!!
No you don't.
Once it floods you can remove the plug and put trim to minimum and throttle to minimum and pull a few time to clear the cylinder.
I would open the throttle wide open. You want the greatest amount of air going through that you can get. At low revolutions (pull cord speeds) you will only get fuel coming from the low jets if anything. It would never be more fuel than could support combustion otherwise the engine would never run at any RPM.

It is very easy to pull the engine over when the plug is out. Three or four pulls should do it. Put the plug back in and then you have to decide to choke or not which will depend on how warm or cold the case is. You could always pull it over a couple of times with out the choke to see if it fires and if not try one pull with the choke. Come to think of it once I have started the engine for the first run of the day I always try to start the engine without the choke for two pulls and usually it starts. That is a good indication that your low needle is not lean.

BTW when you have the plug out is a good time to check for spark.

Ace
What could be more fun?

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