I just bought a brand new OS 91 2 stroke.
I can not get this thing to fire up.......
New OS # 8 plug
plenty of glo
The high speed needle is 3 turns out
It won't even pop????
I do have a remote high end needle on this motor mounted vertical.
My question is....... Is the low end needle (On the carbarator) closed too much???
I had the cowl on so I could not see if it was drawing fuel.
Is this possibly my problem???

Please help

Thanks

Hoss

Can you verify that you have your fuel lines set up correctly? Easy mistake to make?

Very good question........
They are connected right.

Do you have fuel in the combustion chamber

Yes, that's your problem...
Why not bench run it first with everything easily accessible?
Once it works well on the bench then put in the plane and fly it with the cowl off, for easy tuning of the engine. And only after that do you put on the cowl and other bling-bling...

Hoss,


For an engine to run/pop, three things must be present in the combustion chamber:

1. Fuel in the mixture
2. Reasonable compression
3. An ignition source

If one of the above is not present; or is, but in insufficent (or too great) amount, nothing will happen.

Too much fuel in the mixture is too rich to fire; and too lean a mixture is just as non-flammable.

A very low ambient temperature may cause low evaporation of the fuel's components (mainly methanol); so too little fuel will be be present in the air, inside the chamber; causing the mixture to be too lean in effect, to be flammable.
But I think this isn't the case.


The settings of the needles have no effect on whether the engine will pop, or not; just on its constant running characteristics.
If the high-speed needle is open enough to allow priming, it will potentially allow the engine to pop and even to run-on for several seconds.

In your case, to me the glow-plug seems to be the culprit.

What were the temperatures when you were trying to get it to run? If the temps are below a certain point, it gets downright tricky to get a engine to fire up.

As mentioned already, you best bet is to remove the cowl and run the engine with it exposed. Or even better put the engine on a test stand and give it a run to see how it is working.

Thanks for the replys guys
Today I will try it again.
I charged up my field box because the starter ran the battery down.
I pulled off the cowl
I am trying to start it in my basement. (once the wife leaves for work)..... Warm in the basement
I will start with the high needle 2 1/2 turns out
The low 2 turns out. Hope that will work
1 question that I have never seen on my other glow motors is the High speed needle is remote and in the rear of the motor. The low is over the carberator. I can see in the carb as I ajust the needle. I screwed the needle all the way in and the needle ran out of threads..... Hope you understand that?? In other words, the needle never gets tight. I needed a needle nose pliers to lift up on the needle to get it to rethread. MMMMMM

Any Ideas??
Thanks again guys

Hoss

Hoss,


The settings of the needles are irrelevant, for getting the engine to fire...
As I wrote, they become important when the engine is already running.


The [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXCP22&P=Z]low-speed needle[/link] in this carburettor, seems to be more elaborate than that of most other carburettors; having two O-rings instead of just one.

Those issues you're experiencing are typical to newbies... You'll eventually get it with experience.

"I screwed the needle all the way in and the needle ran out of threads..... Hope you understand that?? In other words, the needle never gets tight. I needed a needle nose pliers to lift up on the needle to get it to rethread. MMMMMM "

This is the way the low speed needle is made. It is screwed in from the inside.

When you do get it running in the basement, be sure to have good ventilation or the wife will find you dead from carbon monoxide poisoning when she gets home!

Sincerely, Richard

And if you are not dead, your wife may wish you were when she notices that everything in the basement has a coating of sticky oil. LOL... been there done that.

I assume the glow plug is working and the glow starter is charged. Is she mounted inverted? If so she may merely have been flooded. I have 2 of those engines and, although many claim a problem with either the remote needle or a loose backplate, I've had zero problems on mine. One is inverted, one sideways. And make sure your muffler back pressure line is connected.

Good luck! Keep a window open!!!!

A trick to get a stubborn engine to fire is to squirt a couple drops of cigarette lighter fluid in the carb. If it's gonna fire at all, it will fire on that. I've been having good luck getting cold engines to fire in a cold garage using cigarette lighter fluid. A few seconds of running on lighter fluid repeated a couple of times may warm the engine enough for it to run on regular fuel.

I'm with Augie, I'm going with bad glow plug (even though it's new) or a dead battery in your glow starter.  First thing I'd do is take the glow plug out, cup it in my hand so you can see if it's lighting and touch the glow plug starter to it to see if you're getting any fire.  If you are, my second guess would be something wrong with your fuel tank if you're not getting any draw.... maybe a pin hole somewhere.

Fire, fuel and air. Let's see how he makes out.

Problem solved men.......
It was a bad glo starter. Needle showed it was good. "It wasn't"
THANK YOU all for the responses.

A Merry Christmas to everyone

Hoss

In your opening request you said "plenty of glo". Was it just the needle on your glo ignitor/power panel that "said" this or did you take the plug out to see if it glowed? I'm Still trying to assess the "problem" even though it went away.

Sincerely, Richard

Awesome Hoss, glad you got it started!

if it wont fire and the G plug is good and its getting fuel , it might be a compression problem