well its a cold day and I fire up the old enticer. let warm up for a long time and will not idle. manage to get the thing moving and ride it around. will bog at WOT. ill shut it off, turn it on again and it still runs this same way. when I get some speed up and then brake, when i let go of the brake I hear this whirling sound coming from the clutch side of the motor. I shut her off one more time and she fires up perfectly. Idles smooth at 3000, goes fast and has no problem bogging. the rest of the day the beast will run perfect. mind you she has ben like this ever since I got her. what kind of problem do you think i have?