os 50hyp floods when goin to restart?

[timmmy]

this maybe shud be in the engine section but im sure more will read it here.

if i start my os 50h and run a tank it runs fine if i then cut ,it floods so when i go to restart its solid locked up.
we also run the heli dry and this happend again can this be due to the idle needle settings?
its as if you get it running plug out etc then its fine, but to get it goin every time after were having to take the plug out un flood the engine with the fuel line closed off then put the glow plug on turn it over then open the fuel line.
the usual things have been checked the throttle is fully closed so how does the fuel reach the cylinder?
we also removed the engine back plate to find fuel in there.

any suggestions would be great

[Tim Procter]

I was flying with timmy this afternoon and can confirm this is a strange one..

To add the OS50 Hyper is all but brand new and probably only had half a gallon through it..
When it was brand new it started the first turn of the engine everytime but today was a pig..

We then chose to run the engine completely dry (leaning out until it stopped) and believe it or not we blocked all fuel supplies to the engine even pulled the fuel lines from the heli but came to turn it over to start it and it was locked.. Take the Glo plug out and fuel was oozing out from the cylinder..

Where does that come from, We ran it dry.. took the fuel lines off when re-fueling and yet the cylinder is full of Magnum when we came to start it..

Bizarre but I'll bet someone will come up with something on these forums..

[Kwickkwack]

I had a bit of an issue with mine today seemed to "run away". I have had some good advice regarding cleaning the carb. mine has only had about 4 tanks of fuel through it, and I have to say it pumps the fuel out of the exhaust when running but I do have it rich (about 2--2 1/2 turns out) as it is new.
Hope to run next week after I have finished putting it back together.

[moyesboy]

The new hyper in my 600n pro seemed very prone to flooding when new.
There was absolutely no need to turn the motor over before lighting the glow, if you did it locked.
After about 15 tanks its now more normal, and it does need priming.

Just to check the obvious - you are not allowing some overflow when filling to go into the silencer via the pressure line are you?
It is possible for fule to syphon down the pressureline into the silencer, but not normally unless you have fitted a uniflow setup (then you need to block the pressuse line when you are not running).

[robgt]

Being a new engine, you probably had it running quite rich to bed it in nicely?
how much has it been leaned off from then?
What are your needles settings - base needle points to what hour of the clock when the heli is level?
How many turns and clicks out from fully closed is the base needle?
What muffler are you using?
What fuel are you using?
Any fuel filters in the system, if so what type and where?

Cheers,
Rob

[Tim Procter]

Mmmm. timmy may come in here Rob but here is my take on it.

Being a new engine, you probably had it running quite rich to bed it in nicely?

YES JUST OVER 2 FULL TURNS OUT

how much has it been leaned off from then?

AS THE BOOK SAYS ONE AND A HALF TURNS OUT FROM CLOSED


What are your needles settings - base needle points to what hour of the clock when the heli is level?

CANT TELL YOU THIS AS TIMMY HAS THE HELI AT HOME

How many turns and clicks out from fully closed is the base needle?

ONE AND A HALF TURNS OUT FROM CLOSED

What muffler are you using?

ALIGN STANDARD MUFFLER THE LONG NOISY ONE

What fuel are you using?

MAGNUM

Any fuel filters in the system, if so what type and where?

YES FROM THE HEADER TANK TO THE CARB.. DON'T KNOW WHAT MAKE.

Cheers,
Rob

[timmmy]

magnum 20 done 1.5 gallon so far
main needle was about 2 to 2 1/4 turns out, turned in to 1 3/4 today as it was thirsty
not toutched the idle needle from factory was lumpy to get to half throttle so i moved it in a toutch today not mutch tho.

align muffler,header tank to carb with align filter in line.

possible fuel could have run down the pressure line


shud i need to move the idle screw from factory or do most peeps find it is ok as it is im right in thinking it only adjusts a small amount either way anyway?

[timmmy]

[robgt]

The base needle can adjust through 180 degrees and comes preset by the factory in the middle. Yours looks just a fraction richer (turned anti-clockwise) than factory default?

If the engine has been running quite rich for a while, it's possible that the muffler has a gunk buildup in it (unburnt fuel and excess oil etc) which can seep back into the engine and lock it up every time - it's not liquid enough to pour out easily (like fuel will) but taking the muffler off and washing it out will ensure this is not the issue. I saw exactly this issue on a fellow club members heli last weekend - possibility?

Otherwise, as has been said, make sure you aren't overfilling the tank and forcing fuel down the back pressure pipe.
I guess you detatch the pipe frmo the filter to fill it up? In which case, you can't be flooding the carb accidentally when filling

Cheers,
Rob

[timmmy]

yea mate its like a thick gunk it looks a lot thicker than the fuel
il give that a try it is possible the muffler is full of gunk like you say and would explain what is happening.

cheers top man think thats looking like a good answer!
after 1 and a half gallon shud i lean it down to around 1 3/4 also do you normaly have to adjust the low needle i moved it back from the leaner position i had it at in that picture so il set that back as factory for now.

[barney]

Hi Timmy I reckon Robs on the money with the answer to your problem..

If the engine has been running quite rich for a while, it's possible that the muffler has a gunk buildup in it (unburnt fuel and excess oil etc)

I have come across this problem a couple times and it was a combination of things. Very rich set engines (running in) Castor based fuel seem more prone to this hapenning. Sometimes tilting and giving the heli a good shake is enough to clear it otherwise you need to flush the Exhaust out.

Also make sure you clip your fuel line as soon as the engine is stopped as any remaining exhaust pressure in the tank will still force fuel into the carb untill it dissapates.

Another way it can occur is sitting/starting/storing the Heli on an un-even surface where the Exhuast port is tilted slightly allowing burnt fuel to dribble back into the engine causing it to Hydro lock. Turning the start coupling by hand to TDC will prevent it dribbling back in.

Another good tip is to tilt the the Heli towards the Exhaust before trying to turn it over and only unclip the fuel line once your ready to fire up and the Glow is on.

Hope that helps you Brian

[Tim Procter]

Another way it can occur is sitting/starting/storing the Heli on an un-even surface where the Exhuast port is tilted slightly allowing burnt fuel to dribble back into the engine causing it to Hydro lock.

Tell you what Brian your right on the money there..

We park on the roadside and stand our helis just through the gate and yes!!!!!

On a really steepish bank to work on them and then walk down to the flatter flying area to fly..

The angle we were filling the heli up was muffler on the top side and I'll bet that's the answer..

Thanks mate. Timmy will be well chuffed when he reads this.

Jackpot I believe there mate thank you..

[robgt]

Also make sure you clip your fuel line as soon as the engine is stopped as any remaining exhaust pressure in the tank will still force fuel into the carb untill it dissapates.

I clip my fuel line to cut the engine to help prevent this happening at all
Cheers,
Rob

[barney]

One more to add to the extensive list above...LOL...is when fuelling make sure the feed side to the carb is clamped/sealed properly or even disconnected at the carb side.
The fuel tubing Align supplies in the kit has a thick/stiffer wall and my little clamp struggles to seal it 100%.. could even be this simple so worth checking it out.

cheers Brian

[AndersUK]

Hi Tim,

That is too rich for the hyper even when running in, bearing in mind that the factory rich setting is 1.5 turns out.

At most, I wouldn't go any further than 2-3 clicks out from the factory 1.5 turns and I would only do that for the first 1-2 tanks at most. I would then adjust it back to 1.5 for a couple of tanks. Rich is good for running in but having it too rich is counter productive and will not help the running in process. Get the main back to 1.5 tuns out and ensure the idle screw is parallel with the carb opening.

Once the engine has been run in and leaned to its optimum setting (usually 1 1/4 to 1 1/3 turns for me), it will not flood as easily. However, in the meantime I would suggest not using the throttle kill switch. Instead, use the fuel line clamp to shut of the fuel supply to carb. This will help prevent the flooding for when you start up again. I now do this with all my 90 size machines by default.

If you still encounter problems after this then remove the fuel line from the carb before filling up and check that the fuel line clamp is doing its job.

Andy

magnum 20 done 1.5 gallon so far
main needle was about 2 to 2 1/4 turns out, turned in to 1 3/4 today as it was thirsty
not toutched the idle needle from factory was lumpy to get to half throttle so i moved it in a toutch today not mutch tho.

align muffler,header tank to carb with align filter in line.

possible fuel could have run down the pressure line


shud i need to move the idle screw from factory or do most peeps find it is ok as it is im right in thinking it only adjusts a small amount either way anyway?