A member at our local club has just brought himself a new GS45 engine. However we have not had much luck trying to get it to start and run properly.
We start by opening the needle out three turns, priming the engine and then starting it. This works okay but the problem is as soon as we try to accelerate the engine will die. There is always fuel in the inlet tube so we didn't think it wasn't getting enough fuel. I have also noticed that when the engine is off and the throtttle is opened there seems to be a pool of fuel collect between the spary bar and the barrel, Is this normal? Im guessing that this fuel would be drawn into the enigine if it were running.
We tried opening the needle out another turn but still no luck. We are not sure where to go from here but its getting really frustrating.

Regards,

Troy.

Troy,

This is rather common. The engine's idle needle is most likely too lean. Open it a LOT and then try running the engine. You will likely have to start it at 1/4-1/3 throttle. Open it to full, adjust the high-speed needle, and then retard the throttle to get the idle adjusted.

See the SuperTigre FAQs at:

http://www.supertigre.com/faq/product-faq.html

Bill,

Opening the idle needle a LOT will make the transition far too rich.
I have this problem. It idles too rich, loads up and dies. Also, the throttle barrel hits the spray bar housing and prevents full closure of the throttle. I have tried everything except properly
setting the midrange by turning the spraybar so the fuel metering slot points to the rear to lean out the midrange.

With the fuel metering slot in the spraybar pointing down, one can get a good idle and a good top end, but a massively rich midrange. Please explain the proper procedure for turning the
spraybar to set the midrange.

Thanks,

Here's the procedure we use:

To properly set up your carburetor, there are a few steps...

Make sure the spraybar is set so that the fuel slot is pointed straight down the center of the carburetor. You will have to look through the carb from the bottom, with the venturi opened to full. Loosen the two screws next to the high-speed needle valve to rotate the spraybar so that the slot is centered.

The idle needle can be seen in the slot of the spraybar. It looks like a piece of wire that has the end squarely cutoff. It should be less than one-half way across the slot when the venturi is opened to full.

The high-speed needle should be opened about 2-1/2 to 3 turns out from closed.

All of these settings are very rich. You'll have to start the engine at about 1/4 to1/3 throttle. Once the engine starts, advance the throttle to full. You can then lean the high-speed needle until the engine is running just rich of peak RPM.

Once you have the high-speed needle set, you can retard the throttle a bit and use the idle needle to adjust the engine. Retard a bit, and adjust. Keep doing this until you have reached the desired idle RPM and mixture. Remember, since we started out with an intentionally-rich setting, the idle mixture will have to be leaned.

Finally, the midrange can be adjusted by rotating the spraybar a hair. Just loosen the two screws next to the high-speed needle and rotate the spraybar just a tiny bit. Either direction is OK. This will help you get a good transition and midrange.

I need a muffler for my ST 51 which left for points unknown while flying. Any used mufflers out there?
Thanks,
Roy