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Old 11-01-2003, 07:05 PM   #1
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Default base needle setting for sirio .12 ?

Does anybody know base needle setting for sirios .12, AAC, slide carb?

I bought two of them, one for rc10gt and other for ntc3 and am trying to break them in.

But I just found out that manual doesn't mention it, there's no website about it and nobody here use this engine.

Any help will be appreciated.

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Old 11-01-2003, 07:17 PM   #2
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Straight from Trinity's website:

Sirio .12/15/18 (General Carburetor Settings)
High Speed - 5.5 turns
Low Speed - 2-1/2 (Generally this should be flush with the end of the slide)
Mid Range - Flush then one turn out.


FYI, my Sirio is at 3 1/2 turns on the low speed, and it's on the lean side.
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Old 11-01-2003, 07:25 PM   #3
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Thanks a lot. I appreciate it.

Now I can go out start feeling the power of this great engine.

Quote:
Originally posted by KMac
Straight from Trinity's website:

Sirio .12/15/18 (General Carburetor Settings)
High Speed - 5.5 turns
Low Speed - 2-1/2 (Generally this should be flush with the end of the slide)
Mid Range - Flush then one turn out.


FYI, my Sirio is at 3 1/2 turns on the low speed, and it's on the lean side.
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Old 11-01-2003, 07:33 PM   #4
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Just beware the Sirio plastic carbs have a (well deserved) bad reputation for getting air leaks around the carb. Mine has it and the idle races, then normalizes, races...........etc...... very annoying. Apparently the hot ticket is to replace the carb with a NovaRossi carb, which is all metal.
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Old 11-01-2003, 09:32 PM   #5
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if the sirio that you have has an extra O-ring in the crank case then it should be OK, I have 3 sirio so far none of them have leak.

needle setting 5 turns on top, 4 turn on bottom. midrange not use
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Old 11-01-2003, 10:05 PM   #6
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The sirio carbs come set on a flow meter, the carb comes set at optimal settings. All you have to do is bottom out the needles and count the number or turns to get your factory settings.
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Old 11-02-2003, 06:01 AM   #7
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Quote:
Originally posted by KMac
Just beware the Sirio plastic carbs have a (well deserved) bad reputation for getting air leaks around the carb. Mine has it and the idle races, then normalizes, races...........etc...... very annoying. Apparently the hot ticket is to replace the carb with a NovaRossi carb, which is all metal.
can you tell me.... WHICH SPECIFIC NOVA CARB can be use?

maybe i need to have a spare NOVA carb for the sirio carb... just in case it will leak.... or can i use CA or THREAD LOCK to prevent the leakage?

mop
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Old 11-02-2003, 08:04 AM   #8
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are these settings true for the abc .12 type engine too? some tell me that the rich setting of the high speed needle (for break-in) is about a milimeter exceeding the brass collar. i counted mine earlier and i think its at 11!? am a bit confused.. please clear things up for a newbie here? thanks!
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Old 11-02-2003, 08:06 AM   #9
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This one:

http://www2.towerhobbies.com/cgi-bin...?&I=LXEPM5&P=7
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Old 11-03-2003, 07:29 AM   #10
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I went out last weekend to break them in.

Unfortunately one of the engines raced the way you said. Obviously there was an air leak. Back home I tried to find where it leaked but I couldn't. Now I suspect the plastic carb.

Thanks bunch again.

I'll try it with another carb from the engine that's working.

I was about to dump the engine to go back to RBs that I can trust.



Quote:
Originally posted by KMac
Just beware the Sirio plastic carbs have a (well deserved) bad reputation for getting air leaks around the carb. Mine has it and the idle races, then normalizes, races...........etc...... very annoying. Apparently the hot ticket is to replace the carb with a NovaRossi carb, which is all metal.
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