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Old 11-14-2010, 02:53 AM   #1
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Default Looking for Siro S12 T3EVO4 3rd needle settings

Hi Guys

A mate and I have got 2 second hand Siro S12 T3EVO4 motors and are just having few dramas getting them tuned. I was just wondering if anyone either knows the factory needle settings for the 3rd needle or knows where to get a manual to download. I just don't really know enough about that needle to be mucking around with it and don't want to get in any deeper by playing with it!

cheers

Last edited by WheelPower99; 11-15-2010 at 08:17 PM.
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Old 11-16-2010, 08:41 PM   #2
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Yeah, it seems hard to find any info on these motors... especially any manuals for them.

The carby looks the same black plastic one on the XXXV or whatever it is, if that's any help for anyone??
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Old 11-30-2010, 09:26 AM   #3
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Originally Posted by WheelPower99 View Post
Hi Guys

A mate and I have got 2 second hand Siro S12 T3EVO4 motors and are just having few dramas getting them tuned. I was just wondering if anyone either knows the factory needle settings for the 3rd needle or knows where to get a manual to download. I just don't really know enough about that needle to be mucking around with it and don't want to get in any deeper by playing with it!

cheers
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Originally Posted by NitoriousRC View Post
Yeah, it seems hard to find any info on these motors... especially any manuals for them.

The carby looks the same black plastic one on the XXXV or whatever it is, if that's any help for anyone??
i got 2 unit xxxv but already change the caburetor using picco. and it easy to tune & solved the problem
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Old 11-30-2010, 11:12 PM   #4
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I would say 3 turns LSN, 6 turns HSN. This would probably be a very rich setting, but it will get you started. Make the middle needle flush with the carb body.
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Old 12-08-2010, 02:40 PM   #5
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cheers guys these settings seem to have got me out of trouble
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Old 12-08-2010, 03:09 PM   #6
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cheers guys these settings seem to have got me out of trouble
Careful with the grub screw holding the carby slider balljoint, the carby cylinder is soft aluminium and it can get chewed up and deformed if grub is too tight

As DJ pointed out, the middle needle should be flush, I found that if you richen up the middle fuel type became an issue. Some fuels ran while others just richened and stalled, so stick with the middle needle flush

A good engine tuning friend pointed out the Sirio needs fuel pressure so cant lean out top too much and use the bottom end to your benefit.
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