Interesting, the parts breakout calls out the secondary on #3. Confusing...however the more pricey one is on #1. Then again I my be looking at the diagram backwards.

Throttles, Injectors and Fuel Rail. For 2015 Triumph Rocket III Touring | HERMYS TRIUMPH eSTORE
Must be me but I click on the link and enlargement number ther is the idle speed controller otherwise known as the idle stepper motor. #4 is the secondary tps # 2 is the primary tps. Let me get another beer and see if I can get it to change. In the view I already know the throttle bodies pretty darn good and have had them off no less the 25 times, forced air and NA so if I get the view to change the throttle bodies won't :D
 
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what i am seeing
#2 primary tps
#4 secondary tps
# 3 stepper motor
just like warp said
 
I have a horrible stumble surge misfire at very light throttle, 1500-2000 rpm. Helmet banging bad with a pillion. This TPS is suspect.
 
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