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HelicopterEngines Plugs Mufflers Fuel › YS 61 won't fire!
10-09-2013 06:51 PM  4 years agoPost 1
dela

rrApprentice

Stillwater Oklahoma

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I have a YS 61 (bought with a used heli) that I can't get to start.
I have checked the check-valve. It is installed in the correct direction, and seems to operate fine. The tank is getting pressurized as I spin the engine with the starter. Needle valves are open.

The engine shows no sign of starting. I assume that this is a pump related problem.

I am considering removing the fan shroud so I can get to the carb inlet, and giving the engine a prime through the carb. I'm wishing/hoping that the pressure pulse will unstick the pump, and let it run.

Any harm? Any hope? Any suggestions?

I don't want to remove the engine from the heli if I don't have to. I don't have an engine runup stand, but could build/buy one.

Ron D.

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10-09-2013 07:00 PM  4 years agoPost 2
wrongler

rrProfessor

Brewerton, New York

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Is the glow plug working! Is it wet with fuel? You may try a LITTLE fuel in the head after you remove the glow plug.

Bill Whittaker

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10-09-2013 08:47 PM  4 years agoPost 3
dela

rrApprentice

Stillwater Oklahoma

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Glow is definitely working. Plug is dry.

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10-09-2013 09:03 PM  4 years agoPost 4
Ace Dude

rrProfessor

USA

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If the plug is dry it's not getting fuel. Check the lines and check valve. Ensure the check valve is installed in the correct direction.

  

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10-09-2013 09:09 PM  4 years agoPost 5
Santiago P

rrProfessor

South West, Ohio

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Dry plug = STICKY STUFF
If a YS sits unused for a while Is not uncommon for the pump diaphram to stick and not flex as it should.

You can turn the engine til the cows come home but there will be no pumping action and not fuel will go through the engine.

Pour a little fuel on the carburator and try to start the engine.
You may have to do it a couple of times!

The firing action will flex the diaphram enough to clean it and make it flex as it should, and it will start pumping.

Santiago

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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10-11-2013 07:21 AM  4 years agoPost 6
devin120

rrVeteran

Canada

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...
I disassemble my carbs to the last nut and bolt and clean them every now and then.

I suggest doing the same with this used engine of yours.

Miniature Aircraft - OS power - Futaba electronics

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10-11-2013 05:35 PM  4 years agoPost 7
Santiago P

rrProfessor

South West, Ohio

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I disassemble my carbs to the last nut and bolt and clean them every now and then.
and what do you do to the pump section below the carb?

my point is, dismatling and cleaning the carb is a great advice, but it will do you nothing if the pump diaphram is stuck.

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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10-11-2013 06:43 PM  4 years agoPost 8
devin120

rrVeteran

Canada

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ok
Pour a little fuel on the carburator and try to start the engine.
You may have to do it a couple of times!
The firing action will flex the diaphram
Yes and pouring fuel into the cylinder and pop starting it hoping to un stick the regulator is a great idea.....

When I say carb. I mean fuel system. The regulator is part of the fuel, carburetor system. So remove the bottom cover of the regulator and carefully remove the diaphragm noting orientation and if its dry. It may be stuck so go slow. Clean, wet with fuel, re assemble.

I will be more specific next time moneypitvictim.

Btw I am a technician for high performance vehicles and specialize in engines, electronics, and on board diagnostics. I also have a history for building 4 stroke carburetors for racing.

Oh and use paper towels when handling carbs not rags. Ive seen so many people cleaning their carbs with rags. Clean or not.

Miniature Aircraft - OS power - Futaba electronics

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10-12-2013 04:38 AM  4 years agoPost 9
dela

rrApprentice

Stillwater Oklahoma

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Problem resolved ... Sort of:

Engine had almost no compression. Wouldn't even fire with a carb prime. I replaced it.

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10-12-2013 11:54 AM  4 years agoPost 10
wrongler

rrProfessor

Brewerton, New York

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Probably a bad ring?

Bill Whittaker

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10-12-2013 05:33 PM  4 years agoPost 11
dkshema

rrMaster

Cedar Rapids, IA

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Nothing a new ring wouldn't fix, and maybe hone the cylinder to give the ring a good shot a breaking in correctly.

That is assuming all your head bolts are tight.

-----

If it has been sitting around awhile maybe the ring is stuck in the groove. You can carefully remove the ring, clean off any carbon deposits, and clean out the groove as well. Might be a fix that just a little TLC would take care of.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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10-14-2013 03:07 AM  4 years agoPost 12
Santiago P

rrProfessor

South West, Ohio

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Glad you found the issue,

lots of goods suggestions posted as to what to look for when your YS misbehaves.

S

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10-14-2013 04:05 PM  4 years agoPost 13
dela

rrApprentice

Stillwater Oklahoma

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I'll try cleaning the ring this evening and report back.

Ron

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10-15-2013 01:07 AM  4 years agoPost 14
dkshema

rrMaster

Cedar Rapids, IA

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Danger, Danger, Will Robinson...

Before you try to take the ring off, if you have never done this before, you WILL break it. There is a method to remove AND install a ring in one piece.

Installing a ring HERE:

http://www.mecoa.com/faq/rings/install/install.htm

Removing it, reverse the process above. Do NOT simply try to expand it and slip it over the piston.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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10-15-2013 03:19 PM  4 years agoPost 15
dela

rrApprentice

Stillwater Oklahoma

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Totally unrelated topic:

Does anyone know where I can buy a ring for a YS 61ST heli engine?

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10-15-2013 04:01 PM  4 years agoPost 16
Santiago P

rrProfessor

South West, Ohio

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YS service : http://www.ysengines.net/support/parts/

YS2380 --- YS61ST ring

or Ron Lund (Heliproz south)

http://www.ronlund.com/rcheli/NITYS61ST.html

Santiago

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HelicopterEngines Plugs Mufflers Fuel › YS 61 won't fire!
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