flianbrian

Hi Bax,
(apologies if this has been asked before)
I have a couple of Italian ST2300s (I haven't run them yet), both with older "good" carbs without the infamous dogleg slot in the barrel. I think I read somewhere that new 2300s have another carb improvement regarding the slot configuration. Is this true, and if there is a genuine improvement, can the barrels only be had?

Thanks,
flianbrian

Bax

My Feedback: (11)

The improved carb barrel is:

SUPG4211 22313126 THROTTLE BARREL G2300 $15.99

These parts can be ordered through any hobby retailer who sells SuperTigre engines and accessories.

flianbrian

Thanks Bill,
Guess I shoulda asked before, what's the physical difference and what is expected performance-wise with the change.

Bax

My Feedback: (11)

No real change in the engine's power. The changes address the too-rich midrange the engine originally had by changing how the idle needle moves in the spraybar when you throttle up. The midrange now has much better metering and the engine doesn't tend to "load up" when run between idle and full throttle. Throttle-up and throttle-down are also much smoother.

desmobob

Mr. Baxter,

Will that barrel also fit the carb on the older S2000 engine (25cc)?

Thanks,
Bob Scott

flianbrian

<<changing how the idle needle moves in the spraybar >>

Yes, but what is the physical change in the carb that's doing this? Is the slot in the barrel at a smaller angle, larger angle, original angle, something else changed?

Thanks

Bax

My Feedback: (11)

The slot in the barrel that determines how it will slide in and out as you open and close the throttle has been angled so that is is more in line with the axis of rotation...so that it doesn't move in and out as much when you open and close the thottle.

flianbrian

Bill,
So sorry to bother you again. Is the part number you posted only the new throttle barrel? That is, if I ordered this, would I get the new one only, and not some leftover stock of the previous configurations?

Thanks,
flianbrian

Bax

My Feedback: (11)

All stock should be the new version.

trroscoe

My Feedback: (39)

Bill

I also have one of the Italian G-2300's with the throttle barrel that has the straight groove. Do I need to replace this with the new one or will the one that I already have work ok. I have not run this engine myself but the guy that I got it from said that it ran great the way it was. It has about 25 flights on it and starts and runs good. I don't know what to expect but after reading some of these threads about the carb I was wondering about this throttle barrel.

Rick

Bax

My Feedback: (11)

The Italian version of the SuperTigre G2300 had several variants in the groove of the carb barrel. There were a few different straight grooves and a curved one. The early versions worked best.

The only suggestion we have it to try it and see. If you can get a good top=end and a good idle, but the midrange is too rich, then you'll need a new carb barrel.

trroscoe

My Feedback: (39)

Bill

Thanks for the quick response. I went ahead and ordered one of the new carb barrels just for insurance. For what they cost it is worth having one standing by. I love Super Tigre engines and have several of them. I have a 3000 on my 1/4 scale ultimate with a perry carb on it and it runs great. I have the engine mounted inverted and have an onboard golw driver on it that comes on at anything lower than 1/4 throttle. It never deadstick's and runs and starts great. I hope that I can get the same performance and reliability out of the G-2300.

Rick

Cuzlikedam

My Feedback: (22)

what can i do with a 2300 that wont idle at all. i made all the mods that people have posted and still no luck. it has a great top end , it runs fine when i pull it down to half, when i go down to a quarter the engine starts to what seems like throttling itself down. it slows way down and dies. i'm running a master airscrew 18x8 with omega 10% nitro and 18% castar oil. i have a bisson pitts muffler with one stack closed off for more back pressure. also the enigne seems to get really really hot when i lean out the high end. so hot that if i squirt some fuel in the carb after i shut it off it sounds like its boiling inside the carb. when i richen it up a little bit the heat seems to go away but the idle gets even worse. i found out that i do have a curved throttle barrel and i plan on ordering a "new" one but will that fix the problem. i was also wondering what is the factory idle setting for my st 2300? i hope i can get this one figured out. i'm a die hard super tigre guy but this one is really try'in my nerves. David

Bax

My Feedback: (11)

Most problems with the early G2300's involved being too rich in the midrange, even when the top-end and idle were correct. Running real hot all the time indicates a too-lean mixture, or a fuel with too-little oil content. Fuel must have no less than 18% oil content, and we'd suggest a synthetic-castor blend.

The new carb rotor eliminates the richness in the midrange.

If your engine's trending lean, then it's not getting enough fuel, or you have a fuel system problem. Air leaks, cracked fuel lines, vibration-induced fuel foaming, and so on are typical problems. Don't forget restrictive fuel lines.

FalconWings10

My Feedback: (4)

Bill, I purchased a 2300 from Tower this summer but haven't run it yet. How can I tell if I have one of the "good" carbs and could you recommend a good replacement? Such as, OS?

Bax

My Feedback: (11)

Any new SuperTigre G2300 engines purchased after mid-2003 will be the new ones. The engine was out of production for a few years while SuperTigre production moved to Chine and the engine was sorted out. When it was re-released, it had the carb fixed. Your engine will have the good carb.