In looking at my previous SEPST tune, it has the injector size at 4.00. I've read that they are 3.9 as of 2006, but those were smaller motors. Does anyone know definitively what size the stock injectors are in the 2011+ 103" touring motors?

Thanks,

Mark

 

The 3.9 gm injectors were last used in 07. 4.2 gm injectors were standard starting with the tbw bikes in 08.

 

Thanks!