How do you replace the injector?

I need to replace or clean my injector (2010 FE450). I can't seem to find instructions on how to do so. Are there any published instructions or photos anywhere? If not, can someone list the basic steps along with any tips on how to do the job without introducing new dirt?

It seems that I got something in the line while replacing the fuel pump and/or installing the in-line filter.

Do I really need to pull the whole throttle body off to swap out the injector?

When I installed (and later removed) the in-line KTM filter, I just tipped the bike onto the right side and pulled the fuel rail off. Can I get the injector out this way as well? Or do I really need to disconnect the TPS and map sensor and pull the throttle body off the boot.

I have the tank and radiators off already and my replacement injector came yesterday, so I am hoping to swap the injector tonight.

I swapped out the injector last night, and yes, I did have to partially remove the throttle body. What a pain that was. I made the mistake of loosening the bottom boot clamp first, which made it really hard to get the air box off. And I couldn't figure out how to get the electrical connectors off. The latches often seem to elude me.

I tried cleaning the bike good before starting, but there was still a fair amount of dirt stuck to everything. I then used a contact cleaner and paper towel to clean it up more, but it was still kind of dirty. I hope I didn't get any dirt in the system or damage the electrical connections. I haven't yet put it all back together for a test.

This morning I temporarily hooked up my fuel tank so I could test it. It fired right up and ran great. I couldn't ride it, but I let it run without airflow for quite some time. It took a long time for the fan to come on. On my last ride the fan was on almost all the time. My newly installed temperature gauge indicated the fan came on at about 215 degrees F. My max temp was 217. I am sure it was much hotter than that on my last ride.

Since I changed the fuel pump, the inline filter, and the injector, it is hard to be certain that the injector was the problem, but I suspect it was. I will see if I can get it tested, but it may be fixed now anyway. When I took it out I tapped it above a paper towel. A few small black chunks fell out. I am not certain they came from the inside, but I wonder if they were small bits of fuel line from when I cut the hose to install the CanAm filter. Although that was long ago.

I had a friend that is an amateur auto mechanic clean mine. Some auto shops can do it. Or you can do it yourself. I watched some YouTube videos that showed how to hook up a test jig. You need to power the injector to get it to open up, and then spray some cleaner through it.