I've got a ST-3000, on a Robin Hood 99 - and it's flamed out on me mid-flight several times.
I don't know the history of this engine, but I suspect it may have just a few flights "total" on it.
I think I was using 10% nitro fuel, and an OS #8 plug. Sounded great on the ground at idle, and full power.
Any ideas based upon your experience with this monster?
Thanks.

We solved that persistent problem by installing a CH ignition system w/spark advance.Well worth the price.

I just posted a reply to another query re the big ST motors. I`ll say it again. I use 10% Klotz and 90% straight methanol in both the ST3000 and the ST4500 that I am currently operating and have no problems now. I did have problems when using a higher percentage of oil, and that was straight castor.

I seem to recall reading in the original instructions that no nitro was required. I also seem to recall they specified castor oil only too.

I am also using the original ST plug that came with the ST4500. I acquired the ST3000 secondhand and well used and haven`t got around to needing a plug change yet. When necessary I`ll try an OS #8, only because that is what I have got going spare.

What makes anyone think they know better than the manufacturer as far as carbs go.

My suggestion is don`t get bogged down with too much half-baked theory and hearsay- try using the fuel and plug specified by the manufacturer and keep everything clean.

Alan W

The reason people try the OS carb is because many people have found out that they can't keep the Tigres running in the air. There is something peculiar about the ST3000. A buddy had one and we tried all of the recommended procedures (10% oil fuel, 18% oil fuel, FAI fuel, 5% nitro, 10% nitro, OS-F plug, Fox plug, stock carb, various prop sizes). His would quit about 2 or 3 minutes into the flight no matter what or how rich or lean the needle was set. I also know there are other people that have good running ST3000 motors. I suspect there are some quality control issues. Some claim that there are motors that went out with an unusually small ring end gap. When the motor runs for a few minutes it will seize. We didn't verify this theory with my friend's motor because he got rid of it first. I'm not new to motors and have never come upon one that I couldn't get running correctly until this ST3000. I also had to struggle with the ST2300 (like so many others did) to get that motor to perform right. Everyone now knows that the ST2300 problems were caused by a screwed up midrange metering system on the stock ST carb. A Perry Mega #5001 carb fixes it, as does an OS carb.

So you see, the factory engineers don't always get it right, or someone else may make a mistake on the production line and substitute the wrong part or machine it to the wrong dimensions.

My freind put me on to using the perry regulating pump. When I bought one I didn't even run it without the pump. They are easy to install and not to awful hard to tune either. I never had a problem with my engine. My friend who is a very experienced. engine man, had all kinds of dead sticks until he pumped the engine. Now it runs sweet just like it should. He has owned several big tigers and he won't even try to run one without pumping it. Everything else is left stock. The stock carb if fine once its tuned. Hope this helps. The pump is only about 25 bucks form tower. Happy flying

Set the nipple to the rear bolt,,,,if carb is on back point it to the front bolt as it is on my 4500 and set the low with a blowing of air till you can just hear it comming out. Set the high to 2 1/2 turns out and you will be real close....trust me....works...i have no problems with any of my tigres...and also use tigre fuel from byrons....the best...12 perc. oil...