Super Tiger S2000 tuning (HELP!!!)
 

I just bought a beautiful Taylor Craft which came with a SuperTiger S2000 engine. My budget is shut so replacing the engine at this time is not going to be possible, which means I need to make this engine run if I want to fly the plane.

The problem is that the engine starts fine but as soon as it reaches about 1/3 throttle, and up to around 2/3's, it sputters badly. Past the 2/3 mark and it runs fine. We tried adjusting it for about 20-30 minutes and nothing we did changed the behavior.

To make things worst, I decided to take the carburetor apart for cleanning and forgot to note the position of the low end needle.

Can anyone shed some light on this engine?

Thanks,

RE: Super Tiger S2000 tuning (HELP!!!)
 

Try this procedure

http://www.lymanslack.com/Articles&Archives/st.htm

The other option is to replace the carb with a OS 7D with the insert removed, I use this carb on mine. A newer ST 90 carb may be another option as they are very easy to adjust and can be bought very cheaply.

Regards

Johnkpap

RE: Super Tiger S2000 tuning (HELP!!!)
 

The S2000 is one of my favorite engines. It uses the same .61-1.8 carb that most people hate. Always set the high speed needle first. Low idle will be the leanest point so lean until it dies out off idle and back up until idle and response are perfect. It will likely still be a little rich around half throttle.

RE: Super Tiger S2000 tuning (HELP!!!)
 

How do you know that this is a 2000?

Did the previos owner run it much? Did he know how to set a super tiger?

How long has the engine been run? Is it broken in? The tigers I have run take at least an hour of running to break in.

What fuel are you using?

What glow plug is in the engine?

What muffler is on the engine - is it the original super tiger muffler? If its an aftermarket muffler most of them do not have enough back pressure to feed fuel into the engine correctly, so as a result you will have trouble setting the carb.

how high is the fuel tank centerline compared to the carb fuel inlet? it needs tobe pretty close to the same height.

Ed

RE: Super Tiger S2000 tuning (HELP!!!)
 

Ed,

The engine has a big S 2000 stamped on the side.

The previous owner told me he flew the plane at least 10 times. A mutual friend also flew the plane and confirms the engine ran fine. The plane was stored for at least two years before I bought it. The owner has another two planes with smaller ST's so I have to assume he liked them and knew how to tune them. He is in bad health and getting him to help is not an option.

Using 5% nitro, 18% oil (do not know if syn or castor) Maxy fuel. Installed a brand new OS F plug. The muffler is an aftermarket Pitts style muffler. The fuel tank is center with the carburetor.

I am a Saito-man so these engines are a mystery to me...

Thanks,

RE: Super Tiger S2000 tuning (HELP!!!)
 

The man is right about the muffler back pressure. I have owned many S2000, both the 20cc and 25cc. As I recall, the 2500 (25cc) one has a 25 stamped on the mounting lug. Both are in the S2000 crankcase. The 3000 has 3000 on the bypass.

If you are using a Pitts muffler, you need to plug one side or squeeze both sides partially closed. This will increase the back pressure.

On the 2000, there is no need to change carbs. The 3000 is a different story. The original, .60 sized carb worked great. When they went to a larger carb to get more power, they totally screwed it up. As has been mentioned, I have used an OS 7D and also a cheaper ASP/Magnum 1.08 carb, which worked just as well. But you shouldn't need it on a 2000.

A 16-8 is a good prop. Don't expect OS 1.20 AX power. These Super Tigres were made for big scale planes and were very popular in their day.

The 2000s and 3000s normally need to run a low oil fuel. Morgan used to sell Cool Power and Omega Super T fuel for them. As I reall, it was 14% oil. The higher oil content fuel will run, but tends not to idle as well.

These engines are European designed and have a fairly high compression, so never run more than 10% nitro. 5% is better, especially in the summer. We Americans tend to like 10%-15%, but it will only give you grief in the big Tigres.

They are very easy to hand start, if you know how, and I don't remember ever using an electric starter on 6 or 7 STs on 3 Mokis.

1. Open the carb all the way and choke 4 or 5 times.
2. Flip the prop over 6-8 times until you hear a pop-squish, indicating that the cylinder is wet.
3. Hook up the glow ignitor
4. Put the prop up against compression forward like you were going to flip it like a .40
5. Never, never, NEVER, flip a big glow engine through compression. It will try to tear your hand off.
6. Slap the prop backwards. For a right hander person, this is underneath the spinner. The piston will bounce up against compression going backwards, fire and start going forward.
7. Once you get this technique down, you'll usually get one-flip starts every time.

Remember, you put it up against compression like you were going to flip it like a .40, then you slap it the other way. This works good for smaller ABC engines like OS .46AX , .55AX, 1.20AX.

RE: Super Tiger S2000 tuning (HELP!!!)
 

Please see the sticky note on carb setting at the top of the SuperTigre support forum. It applies to ALL SuperTigre engines.

RE: Super Tiger S2000 tuning (HELP!!!)
 

Hi!
You know you have to use 0-5% nitro!? No more!
What you describe is typical of running a engine on too much nitro!

RE: Super Tiger S2000 tuning (HELP!!!)
 

Yes, I am using 5% nitro.

RE: Super Tiger S2000 tuning (HELP!!!)
 

ed , i have a ?, does the fuel spray have to flow through the exact center of the cats eye on the carb. because, if you
put it there your going to have a rich idle, or am i wrong?

RE: Super Tiger S2000 tuning (HELP!!!)
 

The recommended fuel is one with about 15% oil content until it's well broken-in, and then 10%-12% oil content afterwards. Oil is 100% castor oil, which is what SuperTigre of Italy recommended at the time. Nitro would be 0%-5%.

Bill, Can you direct me to this sticky note? Patrick

The page you want is on the ST website: http://www.supertigre.com/faq/product-faq.html#q22

Thanks Bill!

My name's Tim, but you're welcome. :)

Thanks, Jim.

It will end up about right there.