Yesterday, my dad was riding his brute force 750, and it started firing up with difficulty, smoking kinda white or blue ish (hard to tell when it was night). It smelled sort of sweet but. It has been starting on one cylinder and then running on 2 since april when I rode it😬. I was riding it on trails a bit and it overheated (I shut it because the fan was not coming on and I shut it off and let cool. The rad was not clogged we blew it out and same problems. ( I was not riding hard just cruising and gassing it a little on straightaways ) We fixed the fan but now it still overheats, and now burns coolant. The smoke was almost certainly coolant because it did not loose any oil. My dad thinks it's a blown head gasket or a cracked head. My dad is completely blaming it on me but the fourwheeler has had thousands of miles since he put on a new top end, and crap wears out. Anybody have this happen to them? What do you think the problem is?