carb jetting

[Guest bikerrrbob]

Hello, thanks for welcoming me to this forum,

 

I have a 2005 Royal Star with custom exhaust installed at the dealer, he also rejetted the carbs, thing is, sinse then It's been getting lousy fuel mileage, less than 200 km's on a tank at 110 km's/hr. I think he went too big with the jets but I don't know what the factory settings are, main, pilot, ect., also thinking of installing a K&N air breather to help out.

Any help on this matter would be apreciated.

 

Bikerrrbob

[pegscraper]

Welcome aboard. Were just the mufflers changed, or were the head pipes also changed for bigger ones? A muffler only swap doesn't generally require rejetting. Usually just backing out the pilot mixture screws a bit is enough.

 

Stock jet sizes: pilots are #15, and mains are #122.5 for cylinders 1 and 2, #117.5 for cylinder 3, and #120 for cylinder 4. The staggered main jetting is a little strange. No one has a real good explanation for it, especially being a water cooled engine. But that's what they did.

 

K&N air filters don't require rejetting either, which tells me that they do absolutely nothing for increasing the airflow or performance on this bike, or else they would require rejetting.

[Guest bikerrrbob]

Thats great, thank you, now I have a starting point to work from.

 

Bikerrrbob

[bikenut]

In MY 2006 Venture I run a 17 pilot in all carbs and up one jets size more in each carb.

I get 38 mpg pulling a trailer running about 65mph. And it is loaded most of the time.

I have the dyna 300 setting 3, Opened up air boxes, RK Pipes with just baffle left in,Jason Mod, Shimed neddles 10 thousands, Torque Masters under the carbs, Run Amsoil 20/50 and syn rear end lube also.

Bikenut:cool10:

[speakerfritz]

do all rejet kits require drilling? I have a 2013 venture I want to rejet 1 step up in jet size.

[lonebiker]

Has anyone tried the same size main jet in all carbs? Like say 130 in all 4 carbs