I've just started up a bike that had been sitting for about 6 months. If I roll on the throttle very gradually it runs ok, but if I jerk the throttle back at all it stumbles or cuts out altogether. If I'm going fast enough, after a few seconds it'll start running normally.
I cleaned the carbs out pretty good and added some marvel mystery oil to the tank. I've run through a little over a tank now. What's my problem?
Thanks.