When my Raptor is hot and I shut it off and restart it puffs out a little black smoke??? I am running the foam pro-flow fitler with no air box lid and jetted accordingly. what do you think the problem is?? I am hoping that it is just jetting of something, could it be a problem in the engine??? it only does it when hot and during start up, thats it, please help me out, other then that it runs great! Thanks for any help