03 450fse starts cold, but not hot. Need help.

[Zanderson]

So, I just got a 2003 450fse, and it fires right up when cold, but it warms up it will hardly idle and if it dies its basically impossible to start again. I though it might be the valve clearances, but i checked them this morning and they where right on the money .15mm intake and .25mm exhaust with the engine cold. The spark plug was a step hotter (NGK CR7E) and had to big of a gap. Re gapped it and still having issues. Just tried the normal spark plug (NGK CR8E) it calls for but still only slightly better if at all.

when its running its fine as long as i say in the throttle when stopped. I really want to make the bike street legal and commute with but not till it starts consistently and idle when hot.

it does backfire when it wont start as well, i think either there is a temp sensor problem or the fuel injection system needs to be re calibrated. If so anyone in my area have the software because i dont have the money right now to buy it myself.