Motor won't stay started

[RandoTheKing]

Hi everyone,

I'm completely new to Nitro RC, but it's something I've always wanted to try. So I bought a cheaper beginner model from NitroRCX to see if it was something I wanted to seriously get into. I bought the model below:
http://www.nitrorcx.com/exhyspbeve1s.html

I'm having trouble getting the engine started. Last night I got it started but it was too late at night to run it in my neighborhood. So to turn it off I pinched the fuel line (per instruction manual). Today, I tried for over an hour to get it started and keep it started but I've had no luck. Here is what I do before trying to start it (per instruction manual);

-Remove air filter
-Pull back throttle to open up choke
-Pour a few drops of fuel
-Close throttle and replace air filter
-Place ignitor
-Pull start

The engine will start but only for a second and then stall. It's important to note that if I do not directly put any fuel in the carb then it won't start at all. I've messed around with the needle and that didn't help. I THINK fuel isn't properly flowing (the line is good and not pinched). I put my finger over the exhaust and pulled the cord a couple of times to get the fuel flowing (per instruction manual), but I don't think it's doing anything (it did work last night).

So how can I tell if I have a fuel problem, and if so, how can I fix it?? I don't think it's flooded because the cord isn't hard to pull, plus I've drained it and started over to check. I know the glow plug is good because it turns orange when ignited.

Any help?!?! Thanks!

 

[robmob]

It's starting right away due to the fuel you pit in the carb which isn't very much. Once it burns off it will die if the fuel in the tank hasn't reached the carb.

You need to prime it in order to get fuel to the carb before starting.

Easiest way is to pull the pressure line off the pipe and gently blow into it until you see the fuel in the fuel line just reach the carb. Be sure to stop once fuel reaches the carb. Now reattach the pressure line and try starting it.

You can also put your finger over the exhaust tip and pull the pull starter. This will also force fuel into the line. Again, be sure to stop priming once you see fuel reach the carb.

 

[RandoTheKing]

There is already fuel in the line to the carb. I tried doing blowing into the tube and the fuel still isn't moving. I can tell because there is a tiny air bubble in the line to the carb that isn't moving.

Also, I tried putting my finger over the exhaust and pulled the starter, but it isn't moving fuel. It's almost as if there is a pressure problem? Something blocking the fuel?

 

[MotoGod]

Pull off the fuel lines and check to see if they are obstructed. Air bubbles in the fuel line can cause issues as well. Blow in the fuel line until the fuel reaches the carb....then keep blowing for 1 second or so. See if that helps.

 

[RandoTheKing]

Got it started! Thanks everyone. I'm not sure what fixed it, but I loosened the needle a little more, drained the fuel lines, cleared the fuel from the carb, and presto!

Thanks again

 

[Scrogg]

Sounds like you had a blockage in the HSN housing. I'd triple check it. Pull the HSN out completely and blow fuel through the housing to flush it. Check the O-rings and grease them before you re install the needle.
New engines sometime do not make compression, so priming them is very hard. After they run a few tanks the piston and sleeve wear into each other and form a seal. That's when you start to get real compression and it will suck fuel to the carb much easier.