My boy has a 01 or 02 f4i that runs really good untill the bike gets to operating temp, then starts to fall on its face. the bike has had blue devil put into it, don't think that is an issue tho. Any ideas? also after the bike does get warm it will still idle pretty good its just under acceleration.

 

Sounds to me that whatever was meant to be sealed with the blue devil is expanding under load, hence the time it occurs. Also water pump could be clogged now. that **** is notorious for fixing small leaks but not for the level of abuse stunt riding does to these bikes.

 

true, but i have no water in oil, no leaking from exhaust, no noises.. just loss of power like crazy