I've been told my injectors are pretty dirty and am planning to take my bike in to have them taken off, cleaned and flow tested when I get some time (can't physically leave my bike at the shop without being there). I was thinking of those fuel injector cleaners from STP and the likes for the time being.
1) Are gas tank added fuel injector cleaners effective?
2) Are they safe to use in sportbikes?
3) What are the symptoms of dirty injectors?
4) Any parts I should change when I actually get my injectors pulled out?