The way I understand the OEM # BONNYUSA states TBS needles Aftermarket # is N3RF Thruxton # NBZT Triumph # T12410240 Which is okay if you have the twin keihin T1242700 of Which I don't on my 06' black & chrome speedy I have the twin keihin T1245050. Run of the mill OEM # ( No special # )Perhaps the needles were down graded in the afore mentioned ? At least that's the way I read per diagram and part's listing at BikeBandit. Are there two sets of twins one being set apart from the other in this case? See Tech vault, pick intake/carbs go to carb info and mods--- see Triumphants web page;"TRIUMPH Thunderbird sport" needle for T1240680 Twin Carbs.(TBS)
Last edited by speedblastr; 03/31/2007 4:26 PM.
