Hello all, I've been in a bind with this for awhile now. And sorry for a long post, i just want to put everything on the table.. Looked through tons of forums, and either what fixed their issue didn't fix mine, or the answer is just never found. As the title says I have a 2005 600 that I bought to work on. When under load it wouldn't rev past 10krpms, but wasn't too big of a deal to me at the time. Swapped from stock CCT to APE manual CCT, and when i looked at the cams the forward cam (exhaust, closest to headlight?) was a little above the mark, but the rear cam (intake?) Seemed to be 180 degrees from where it needed to be. Followed all the steps to put the cams back in timing, counted to 12 or 13 teeth (whatever the manual said it was, i can't remember exactly right now). Didnt fix it. So I looked at the fuel system, cleaned all the rust out of the tank, fuel pump, replaced the pump filter with new one, and had the injectors cleaned by local shop. Sometime after that, bike wouldn't go past 5-6krpm, would just fall on its face and backfire, but getting to that point was silky smooth. Then the revs would stay at 3,000 rpm on decel or engine brake, and sometimes would go down, sometimes had to shut the bike off. Checked dealer mode, gave me code C25 and C26, so I swapped the plugs with new ones, then moved the coils around, and the codes didn't change, bike still had the same 2 problems. Took it to a shop, they ran a fuel pressure test, said it was 25 psi so they rebuilt the fuel pump (?) And tested, came to 48 psi. Then they recleaned injectors, tank, fuel rail, ordered 4 new coils and tested the connections, said they were in spec and said they even fixed the RPM sticking issue. They did not. Due to moving, cant keep it at the shop to work on. C25 and C26 still shows up, and now won't go past 8k RPMS under load. Did some reading, and unplugged the IAP sensor, bike idles better and just revving it up in N, doesn't stick. Took it for a ride around the block, still doesn't stick. Shortly before I returned, the rpms started staying back at 3k, even though it had done fine so far. At this point I have no idea what else is next. Kickstand switch is good, no clutch bypass, no other modifications besides a yoshi slip on that came with the bike. Is there something else I should be looking at so im not trying to throw parts at it like I feel a shop would? Also, thank you for sticking through to the end.