Looking for Siro needle settings
11-14-2010, 01:53 AM
#1
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
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 07:17 PM.
11-16-2010, 07:41 PM
#2
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??
The carby looks the same black plastic one on the XXXV or whatever it is, if that's any help for anyone??
11-30-2010, 08:26 AM
#3
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
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
11-30-2010, 10:12 PM
#4
Tech Addict
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.
12-08-2010, 02:09 PM
#6
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.
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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