Hello Everyone, I recently purchased a Super Tigre GS-40 for my Eagle II trainer. Today I started
to break the motor in. I followed the instructions completey, it took a few minutes to start but it did start and ran continuously for the whole 10 oz tank I followed the break in procedure putting it in full throttle for 5 minutes then doing the pinch test and 1/8th turn on the high speed needle to start leaning the motor outyou know the whole process. This went BEAUTIFULLY and the motor ran strong the whole time i ran it but as soon as the first tank was out i turned it off and refilled the tank to continue tuning/breaking in the motor, well the motor would not start at all and i had to put the needle settings back at square one and go back through the steps to only have it happen again on the next tank I dont no why it wont start right up after tuning it, im running 5% omega fuel in it the LHS said it was all i needed. Please help I want to get the motor tuned so i can learn how to fly.

hmmm... just not positive on tihs one. are you running it dry after you complete a tank, and if so are you priming it. it's not your glow plug is it???? not quite sure.

I dont think its the glow plug because it does start after i re set the needle

A glow engine that won't start at idle is a sign that the low speed needle is too lean.

Back the low speed needle out 1/2 turn and try again.

CAUTION: This is a ringed engine, so don't treat it like you would an ABC or ABN engine. It must be broken in very rich.

How warm is the engine when you're trying to restart it? I've found that many engines are difficult to start when they're still hot because the compression is slightly lower and the fuel evaporates too quickly. Let it cool down between runs. This will also improve your break-in.

Make sure the engine is primed. Some engines like to "start wet" as I like to put it. That means it needs a good healthy prime - but don't hydrolock it! This is where a chicken stick comes in handy.

You should not need to touch the needle valves to restart the engine. If you do, just slightly richen the high speed needle. You may be leaning it out just a bit too far once you have it running.

Brad

Just a slight correction. ABC/ABN engines pick up compression when they cool off, and have lower compression when hot. Ringed engines are the reverse, the ring expands as it heats, so a ringed engine will have less compression when cold and should have noticeably more compression right after running.

I agree with the rest of the above. Run the engine rich.

Ringed engines sometimes take a while to break in, and my experience with ST engines (limited to working on other guys engines) tells me that they take longer to break in than some other brands. This isn't a bad thing, just something to keep in mind. My older ringed engines were the same way, it takes a while for the ring to fully seat.

You'll also notice that the idle and transition will be tricky when the engine is new, and it's not at all uncommon to have the mixture changing on their own during break-in, especially the low speed.

If I had to guess, I'd say you low speed is a little lean right now. When you shut the engine down, it's going lean for just a moment, and therefore doesn't have fuel in it to re-start. If you are running the tank down or out, then the engine really is going leand right before shutdown. Once you mess with it for a few moments, it gets more of a prime in it, and starts up. So I think it's more the prime than the engine temp.

Try starting the engine up, running for just a few moments, just enough to get it up to running temp, then shut it down. Now prime it good, and see if it starts.

Thanx for the input guys im gonna run it richer for a few more tanks and let it break in more and see what happens.