stealth_revo

So, a while back my STS 30 was giving me problems (go figure, right? haha). So Isealed it up, and mounted it back on. Now Ican't keep it running. It only runs on the fuel thatI prime into the engine. Once it's gone (2 secs) it dies. First I thought it was the carb. So Itried another one. Same thing. Then Ithought maybe the pipe wasn't pusing air, but it's a new pipe and I don't see anything in the way. I tied leaning it out, and richen it. Nothing. Took off fuel filter, nothing. Tried a brand new tank and new plug. NOTHING! There isn't much compression left. Is that the only left it can be? If there isn't much compression left in an engine, can it not stay running for more than 5 seconds? What do I try next? Is it worth pinching the sleeve? I'm trying to sell this revo, and just want to get it running! The STS used to be awesome. Then it sat for 1+ yrs, and now I have a crappy engine.

nitrojimbo

Put new fuel lines on because you may have a pin hole leak that will stop fuel flow.

stealth_revo

I put a new line in for the fuel, but not for the tank to the pipe.  Could that be the problem if these is a pin hole leak in the exhaust line?

nitrojimbo

No that wouldn't cause a problem because the piston going up and down acts as a vacuum.

stealth_revo

So how does a worn out engine act?  It's very easy to start, just doesn't stay running.</p>