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HelicopterMain Discussion › Cant start my YS 91 HELP please
11-28-2005 10:36 PM  12 years agoPost 1
vipul

rrNovice

New Jersey

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Guys,

I have a Evo 90, got it about 3 months back, everything new with a new YS 91. Engine used to start fine. I am using the Maverick Hydratork starter. So I took the heli to a funfly and filled up the tank but did not fly it there and subsequently for about a month and a half (with the tank still full). Now this weekend I tried to start the engine and it does not start. Actually it started twice but I did not have the canopy on so I thought let me kill it and install the canopy and start it again. But it never did start again. I tried starting it today for 1 hour and could not hear it pop at all.

I have checked and replaced the glowplug, (it is glowing fine so I know thats not it)
I have removed the plug everytime I thought the engine might be flooded and then tried again but no luck
I even dumped all the old fuel and filled the tank with new 30% and still not even a pop.
I have the highspeed needle valve to 1 and 1/2 turns. The low speed is around 1 turn and I messed around with it by opening it up more but still not even one pop.
I thought perhaps my starter was too slow but I recharged the batteries and it is turning it over fine.
Also I tried just plugging in the glowplug for just one turn and tried to start it, I could smell the fuel burning but again no Pop at all.

I tried increasing the throttle at startup from idle to about 1/4 throttle, did not help.

I don't know what else to do except take out the engine and send it to YS. But I mean I was never in a crash and the heli was just sitting there and the thing is that it started 1-2 times this weekend, just after that it does not start at all.

Anyone who can offer any insights into this.........This and my bloody T-Rex with its tail wag has got me really depressed these days :-( So any help would be immensely appreciated. And if anyone lives in the NJ or NY (close to NYC) area, I can meet up with you to have you check it out anywhere. Please let me know. Thanks.

Vipul

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11-28-2005 11:38 PM  12 years agoPost 2
lfalsetto

rrKey Veteran

COLORADO

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Are you getting any pressure? If not this may be the case. Or you may have a hole in the line.

If it will start and not stay running the diaphram may have weakened or gone soft by leaving the fuel in the tank and saturating the diaphram. Take the engine out and carefully take the pump unit out and turn the diaphram over or better yet get a new one. I have had this happen many times on pattern YS engines. Don't do this untill you check to see if you have pressure.

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11-28-2005 11:41 PM  12 years agoPost 3
dgshaffer

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New Jersey

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After going through the process of pulling the plug and crimping off the fuel line, turn it over with the starter for a while (you probably have fuel in the crankcase).

Put the plug back in but leave the flue line crimped off. Warm up the plug for a few senonds before tring to start it and then try starting it with the fuel line still crimped off and the vent open so you don't pressurize the tank.

You'll find that it will more than likely start and then shut down because it's not getting any fuel. If it does then take the crimp off the fuel line and try it again. It should start and run.

If it does you need to remember to release the pressure in the tank and crimp the fuel line and let it die at a low idle as these things tend to flood easily.

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11-28-2005 11:44 PM  12 years agoPost 4
sharam

rrElite Veteran

Northern California - Fly at Morgan Hill Field

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Low end flush with carb housing, mid (bigger needle) at 1.5; high (smaller needle) at 1.25.

Make sure the one-way valve is oriented properly.

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11-28-2005 11:50 PM  12 years agoPost 5
vipul

rrNovice

New Jersey

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Hi,

I try that method in crimping the line, and trying to run the engine before opening up the line. Tried it every time and it did not work this time.

Vipul

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11-28-2005 11:51 PM  12 years agoPost 6
airdodger

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Johnston USA

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Just because the plug glows does not mean it is good. What plug are you using? The fuel line probably swelled from the fuel sitting full for that amount of time. So change all the lines. Check the pressure valve and clean with alcohol. If it has fuel compression and glow it should start. The orifices in the carb could be blocked, check that. Last, the bearing may be so rusty that there is so much drag it won't run. Pull the backplate off and look. Put some fuel in the carb if possible, and see if it pops, if there is no rust. The ring may be stuck and many other causes are possible. Remove the low needle and see if you can get fuel to run through the opening. Chris

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11-29-2005 04:03 AM  12 years agoPost 7
crowfly

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Pleasant View, TN U.S.A.

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When you become so confused that that you don't know whether to scratch your watch or wind your a$$,,,,,,,,,, here's my method for starting most any glow motor. Right now you're not sure if it's flooded or starving for fuel, & whether or not the glow plug is sufficently heated. It helps a lot to have a Radio South glow driver but it is not absolutely necessary. The Radio South driver has led's that give you a hint as to what is going on inside your engine, plus it will allow many,many,many attempts at starting without going weak on you. If you don't have one then borrow one if you can. If you can't, then put a full charge on whatever you have. Have your starter batteries fully charged. We need everything we can get on our side. Start off with fuel that is known to be in good shape (no water). We're going to eliminate not knowing whether it's starving or flooded. Clamp off the fuel line going to the engine. Start off by filling the tank about 3/4 full of fuel. At 3/4 full close of the vent line and continue filling the tank until it is almost full. This will pressurize the tank. Pinch the fill line as you remove the supply line from your fuel jug. Cap off or re-connect your fuel line according to however you've got it plumbed. REMOVE THE GLOW PLUG. Open the hover & high speed needles 5 or 6 turns each. Don't worry about the idle needle. Unclamp the main line. Open the throttle to full throttle. Spin the engine over with the glow plug out. After spinning it over for a short time you will start to notice a very large amount of fuel coming out the glow plug hole (I hope). Continue spinning the engine over, with the fuel blowing out, until you are confident that all the old fuel and raw oil has been flushed from the entire system and the crankcase. STOP... Clamp the main line. Now unhook the vent line and dump the tank pressure. Now we know the engine is primed (to say the least) and that all of the old fuel has been purged. Reset the needles to a good,known, value (where ever they were when it was running right. Leave the main line clamped off (we're definately in a flooded state now). Re-install a GOOD hot plug (OS8 or Enya3) Lower the throttle back down to the starting position. Raise the heli up and dump all that fuel out of the muffler. Hook up that Radio South glow driver. Crank it over until it starts. It will blubber for a while, then it will clean out, then it will die (you've still got the main line clamped). Unclamp the main line and re-start it. When it first starts don't touch it,,, let it run and build up some heat. It sounds like a lot to do, but it's not really. Try it, you'll like it.

If God had meant for man to fly, he would have given him more money

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11-29-2005 05:11 AM  12 years agoPost 8
moorecj98

rrApprentice

na

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Really need to change all your fuel line and check your check value

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11-29-2005 07:41 AM  12 years agoPost 9
crowfly

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Pleasant View, TN U.S.A.

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The fuel line in my one gallon fuel jug has been submerged in fuel for over three years now and is in perfect condition.

If God had meant for man to fly, he would have given him more money

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11-29-2005 08:33 AM  12 years agoPost 10
Liron alm.

rrApprentice

Israel

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I saw this happends one time at our local field..
a guy finished flying and refueled for another flight, but the engine wont start... he took the pump unit out and checked for any damage to the membrane.. also, he cleaned the fuel passes with air pressure..

the engine built pressure in the tank, but just wouldnt fire up. we removed the plug and dropped a few drops of fuel in the plug hole.
then, we screwed the plug back and the engine fired but stalled again. that was a sighn that the engine isnt getting the fuel into it...

as i saied, after the pump cleaning, the engine worked as good as new.
give it a shot.


liron

fly hard, land harder

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11-29-2005 12:09 PM  12 years agoPost 11
JerBear

rrApprentice

Mesa, AZ

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When my YS 80 would not start I did the usual, change glow plug, check all fuel lines, check the check valve..........etc.

Finally, I replaced the diaphram in the pump and it started right up!

I keep extra check valves and diaphrams now!

Hope this helps!

JerBear

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11-29-2005 12:13 PM  12 years agoPost 12
dgshaffer

rrElite Veteran

New Jersey

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JerBear

Where do yoy your spare YS parts?

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11-29-2005 01:05 PM  12 years agoPost 13
bagobitz

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saddleworth,lancs,UK

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crowfly's on the button...BE METHODICAL.
1- turn starter shaft by hand.....good compression? ok so the bore/ring/piston are ok. also the bearings etc. (you'd feel if there was anything wrong.
2- take the glowplug out and check it"live" blow on the filament,-does the brightness increase? if so, it needs to burn off fuel or oil,so let it "cook" clean.
3- open up throttle full and spin engine. does fuel mist spray from plug-hole? Y.-refit plug. N - pull line from carb. pressurise tank (blow down vent?)fuel doesn't dribble from pipe? disconnect outlet from tank,try again. move to next stage of fuel delivery system. repeat until the blockage is found.
4- normal starting procedure should work.
for an engine to run, you need :- the right mix of air -fuel to make a combustible vapour. Enough heat to light it. enough compression to harness the power. that's it with these engines.
I once tore my hair out with an irvine 36. similar circumstances to you.
followed the procedure above, EXCEPT.. I DIDN'T blow on the plug.Stripped /cleaned carb, took the back off the engine,etc. everything was OK. so I emptied the fuel,opened the throttle and cranked it over until dry. then I checked the brand new plug and the one I'd replaced it with.
Guess what? yup, they both brightened -up when blown on. refuelled, refitted the plug,away she went

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11-29-2005 01:43 PM  12 years agoPost 14
JerBear

rrApprentice

Mesa, AZ

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dgshaffer

One of the local shops has some of the parts on hand now. When I needed the diaphram that no one around here had...........I called YS performance in Nevada and ordered them.

Hope this helps.

JerBear

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11-29-2005 02:48 PM  12 years agoPost 15
Fernando

rrApprentice

Madrid

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Diaphram. I have been there.

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11-30-2005 09:25 PM  12 years agoPost 16
vipul

rrNovice

New Jersey

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Guys,

Got the engine started, seems like the problem was that the Hydratork starter which I got from Heliproz was not spinning fast enough for the engine to start.

The reason for this is that even though I fully charged the damn piece of $#@!#@ MAverick 9.6 batteries, just after using them for 2 months, they just went bad and dont provide enough juice.

Lets see, I paid $30 for them and have charged them a total of 4 times, you think heliproz will take them back ?

Thanks for all your help guys.

---Vipul

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11-30-2005 09:28 PM  12 years agoPost 17
dgshaffer

rrElite Veteran

New Jersey

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You should send the entire starter back before the internal gears shatter like mine did.

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HelicopterMain Discussion › Cant start my YS 91 HELP please
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