I'm a YamaPro tech so here is my opinion. You have an air leak some where and the idle is so high is floods the motor out when the butterflies open up. Look around your boots for cracks so on you know the drill. Then check all your vaccum lines make sure they are routed right. Lastly check your fuel pump could be a bad diaphram or however you spell it. Front breaks I'd say there is air in the lines still usually an air bubble can hide somewhere near the master, pump the brakes up the crack the line going into the master make sure the bars are all they way to the left and you should get the bubble out. Check all the lines carefully for cracks and other faults. PM me let me know what happens..............