Hello, I have a question of course lol I got a 2004 yz 450f and had to replace the head gaskets because it was dumping antifreeze into the cylinder and I guessing the oil too since it was milky and foamy, or maybe that was from the race gas the previous owner ran in the bike. Anyways! When I took a road detour ;-) I noticed that when you pin it in 3rd and 4th gear (its 4 speed tranny) that it feels like the clutch slips and catches? Its a jerking feeling. But when starting off the clutch feels smooth and strong. So I'm at a loss, is this a clutch issue or gear problem or what's going on!? The bike is mostly stock other than a slip on and cosmetics.