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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › os 105 hz-r start issues
06-29-2014 10:55 PM  3 years agoPost 1
f14tomcatfreak

rrVeteran

rochester,ny us

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was out at the flying field today and was trying to start my 105. the engine has a hard time firing. seems as if its not getting fuel. checked the check valve making sure its installed in the proper direction.. glow plug is brand new... pulled the plug to make sure the coil was good... has sufficient glow power also... engine is brand new.. set the high and medium needle to factory specs... high end is 2.50 turns out from fully closed... the medium is 1 turn out from fully closed. carb is open also. using Byron rotor rage 15%. any ideas?

shut up and fly

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06-29-2014 11:00 PM  3 years agoPost 2
TMoore

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Cookeville, TN

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Does the tank hold pressure?

After you try to turn the engine over if you take the fuel line off does fuel want to jump out of the end of the line?

You can't blow through the check valve you have to draw through it so that means it needs to come off at the tank side and you suck on it.

Everything else sounds good as long as you have fire to the plug.

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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06-29-2014 11:07 PM  3 years agoPost 3
f14tomcatfreak

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rochester,ny us

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yes the fuel tank does hold pressure.. also when I disconnected the fuel line it sprays out indicating that there is significant pressure..i took check valve and blew through one end and can feel the diaphragm opening up.. when I blew through the other end I couldn't get the diaphragm to open.. indicating that is good.

shut up and fly

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06-29-2014 11:44 PM  3 years agoPost 4
rudyy

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E. Amherst, NY

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If you take the plug out, and crank the engine, do you see any fuel coming out of the plug hole?

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06-29-2014 11:45 PM  3 years agoPost 5
TMoore

rrMaster

Cookeville, TN

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Raise the idle setting on the tx and see if it will fire.

Delayed Response Operator Not Engaged
AMA SECTION 336 = Good
Drones = EVIL

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06-30-2014 12:43 AM  3 years agoPost 6
f14tomcatfreak

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rochester,ny us

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Yes took plug out and turned it over and fuel did come out... Also put tx near quarter throttle and no start....

shut up and fly

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06-30-2014 12:49 AM  3 years agoPost 7
rudyy

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E. Amherst, NY

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Was the engine running ok previously? Is the compression strong? Have you checked the piston and the piston ring by looking at the exhaust manifold?

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06-30-2014 01:23 AM  3 years agoPost 8
McKrackin

rrProfessor

Lucasville,Ohio

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I'd replace the plug.
My 105 was very very finicky when it came to plugs.
Glowing doesn't mean it's good...It also has to do with the coating on the filament....something to do with chemical reaction stuff that I don't understand but a new plug always got it fired up nicely.

I literally never use the word literally right.

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06-30-2014 01:38 AM  3 years agoPost 9
Josh Kussman

rrApprentice

Superior, NE

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U may try checking the head bolts. I don't know if the shims in the head are ready for 15%. Never had the 105 but may want to check the shims.

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06-30-2014 01:59 AM  3 years agoPost 10
Dan Minick

rrKey Veteran

Columbus, WI

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i used to have to open up my throttle just a touch to get my 105 to start when it was cold. great tank pressure ect.... just a weird problem maybe it was a problem with my linkage

Team Synergy, Team FBL Rotors-------if its not broke...it will be!

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06-30-2014 02:02 AM  3 years agoPost 11
dchekas

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Farmington, CT

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Has it been sitting for awhile with the fuel line pinched?

The fuel in the tubing can cause the line to stick closed, and then it will never start. Easy to miss, as your clamp covers the afflicted area.

Team Align, Team Futaba, Team Byron Fuels, Team Thunder Power

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06-30-2014 02:43 AM  3 years agoPost 12
jschenck

rrProfessor

La Vista, NE.

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saw a similar problem recently. It was the glow plug lighter. In the case I saw it was a faulty wire or ground for the Switchglo.

The troubleshooting that found it was to use a different glow plug lighter directly put on the glow plug, no extension wire or anything. Fired right up then.

Switchglo showed everything was ok by the lights.

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06-30-2014 02:50 AM  3 years agoPost 13
f14tomcatfreak

rrVeteran

rochester,ny us

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The entire setup is brand new the engine is in my new avant aurora. Heli has zero flights.... It does run on a switchglo also... Even disconnected the switchglo and used a freshly charged McDaniel ni starter..... All plumbing is brand new also no kinks etc... Will try a differant plug and go from there.....

shut up and fly

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06-30-2014 03:01 AM  3 years agoPost 14
Josh Kussman

rrApprentice

Superior, NE

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What starter do u use

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06-30-2014 03:30 AM  3 years agoPost 15
Kinger

rrElite Veteran

Granville, OH

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You might want to prime the engine first without glow. Put your finger over the exhaust to draw fuel up into the carb. Once it is there, then light the plug and give it a spin.

Team Synergy

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06-30-2014 08:37 AM  3 years agoPost 16
f14tomcatfreak

rrVeteran

rochester,ny us

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I am using the align starter. we tried drawing fuel by putting finger in the exhaust.also removed the glow plug and put a few drops of fuel through the head. once we did that the engine would fire. then goes dead again,and wont fire up lol!

shut up and fly

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06-30-2014 12:11 PM  3 years agoPost 17
Josh Kussman

rrApprentice

Superior, NE

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You may have a bad regulator.

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06-30-2014 12:35 PM  3 years agoPost 18
f14tomcatfreak

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rochester,ny us

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Was starting to think the same thing... Is there a way to test it?

shut up and fly

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06-30-2014 12:44 PM  3 years agoPost 19
f14tomcatfreak

rrVeteran

rochester,ny us

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here is a photo of the plumbing.

shut up and fly

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06-30-2014 12:55 PM  3 years agoPost 20
rudyy

rrElite Veteran

E. Amherst, NY

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I think you will need to clean the carb and the needle sockets. There might be debris somewhere.

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › os 105 hz-r start issues
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