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Ed_Moorman -> RE: Carb for S-3000 (6/15/2007 11:19:55 PM)
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Back in the 1990s I ran several ST3000s. Thay had, as I recall, 3 different carbs, maybe more.
Bear in mind, the ST 3000 gets its max hp at 7900 rpm, so propping for greater rpm is a waste. You need a large prop that turns about 7000-7200 on the ground. I typically ran an 18-10.
The original carb was from the ST .61. It has a fairly small intake, but the engine ran well with it. You did need a split sleeve to shim the throat of the 3000 down to the size of the carb's base.
The second carb had a bigger intake, but ran crappy. This is when all of us who ran the engine went to different carbs. The first chioce was the OS 7D. It had a large throat and was easy to adjust. The down side was the price, which was around $40 back then. You still needed the split sleeve to make the carb fit.
We soon discovered a second carb that ran well, one off an ASP 1.08. We used to get them for $26. They, too, needed the sleeve to fit. This carb ran great and I typically used it on several ST3000s and 2500s, keeping my lone OS 7D in reserve. The Magnum 1.08 carb is the same carb.
I had a friend from another city who never could get his 3000 running well. No one in his club could get it to run through a flight. We met at a meet and I pulled my engine, installed his, then installed my ASP 1.08 carb without changing the needles. I flew his engine the rest of the 2-day IMAA meet and 1-flip started 8 times. Never had to touch the needles. I kept telling his to spend the $26 for the carb. I think he fimally bought a G-38 or US 40 gas engine.
The final ST3000 carb I know about was on the 3000K, the last model to come out before the 3250. This had a new carb and a very large throat for more power. It had a larger diameter base so you didn't need the split sleeve. I never owned one, but I saw some that ran OK.
I don't think the split sleeves are still available. The last time I bought one, they were listed as a ST2500 part since the 3000K didn't use one. If I had to run a 3000 now, I would order a Magnum 1.08 carb and use some aluminum tape from Ace Hardware to make up the diameter. I would use hi-temp silicone to seal around it to insure there was no air leak. I guess you could also use multiple brass tubes to shim the base of the carb.
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